Review
Chemistry, Multidisciplinary
Andree Iemhoff, Maurice Vennewald, Regina Palkovits
Summary: Heterogeneous single-site and single-atom catalysts are promising for combining the advantages of molecular catalysts and solid catalysts. Covalent triazine frameworks (CTFs) have been studied as support materials for coordinating and stabilizing metal species, serving as model systems for understanding the interactions between different metal species and the supports.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Mostafa Yousefzadeh Borzehandani, Emilia Abdulmalek, Mohd Basyaruddin Abdul Rahman, Muhammad Alif Mohammad Latif
Summary: This study evaluated the aromaticity, stability, and adsorption properties of COF-1, CTF-1, and TPG using quantum mechanics calculations and molecular dynamics simulations. COF-1 showed the least aromatic character, CTF-1 was identified as the least stable but showed good water adsorption properties, while TPG was the best for selective ethanol adsorption. These results can guide future studies on solvent adsorption for COFs materials.
Review
Chemistry, Physical
Zhuangfei Qian, Zi Jun Wang, Kai A. Zhang
Summary: This review summarizes the recent developments in Covalent triazine frameworks (CTFs) as a new class of visible light-active, metal-free, and polymer-based heterogeneous photocatalysts. It discusses various physical and chemical design strategies for morphology, band structure, charge separation, and transfer optimization that directly impact their photocatalytic efficiency, with emphasis on enhancing and maximizing the efficiency for specific applications.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Alberto Lopez-Magano, Noelia Salaverri, Leyre Marzo, Ruben Mas-Balleste, Jose Aleman
Summary: This article presents the design and synthesis of a new covalent triazine framework with high N atom content, which can catalyze the reduction of various brominated and chlorinated aromatic structures under light irradiation and room temperature conditions, including persistent organic pollutants.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Liping Guo, Xuepeng Wang, Zhen Zhan, Yueli Zhao, Linjiang Chen, Tao Liu, Bien Tan, Shangbin Jin
Summary: This study successfully synthesized crystalline CTFs with a wide monomer scope using a novel heterogeneous nucleation strategy, achieving high degrees of crystallinity and nanosheet morphologies for different structures.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Li Zhang, Wendong Zhang, Yao Nie, Yi Wang, Pu Zhang
Summary: In this study, covalent organic frameworks (COFs) were used as a carrier to grow ultrasmall rhodium nanoparticles (Rh NPs) in situ, which were uniformly distributed in the pores and on the surfaces of the COFs. The formed composite (COF-Rh) exhibited excellent peroxidase-mimetic activity due to the catalytic activity of the ultrafine and highly dispersed Rh NPs and the high affinity of COFs for organic molecules. Cysteine (Cys) could inhibit the peroxidase-like activity of COF-Rh, leading to the development of a colorimetric method for Cys detection.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Marcos Martinez-Fernandez, Emiliano Martinez-Perinan, Alejandro de la Pena Ruigomez, Jorge J. Cabrera-Trujillo, Jorge A. R. Navarro, Fernando Aguilar-Galindo, David Rodriguez-San-Miguel, Mar Ramos, Rebecca Vismara, Felix Zamora, Encarnacion Lorenzo, Jose L. Segura
Summary: This study presents a new method for the synthesis of covalent organic frameworks (COFs) that allows for room-temperature and scalable production. The fluorinated DFTAPB-TFTA-COF synthesized using this method exhibits intrinsic hydrophobicity and enhanced crystallinity due to the effects of fluorine atoms. The material also shows excellent electrocatalytic properties for the oxygen reduction reaction (ORR), producing hydrogen peroxide selectively with low overpotential and high turnover frequency.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Chaonan Jin, Ning Li, En Lin, Xuepeng Chen, Ting Wang, Yan Wang, Mingfang Yang, Wansheng Liu, Jiangyue Yu, Zhenjie Zhang, Yao Chen
Summary: This study developed a photoenzymatic platform for asymmetric catalysis by immobilizing wheat germ lipase (WGL) onto rationally designed photocatalytic porphyrinic covalent organic frameworks (COFs). The WGL@COFs photobiocatalysts demonstrated high enzymatic activity and good operational stability, and exhibited excellent performance for an enantioselective Mannich reaction under visible light irradiation. This work provides a general and efficient strategy for fabricating photobiocatalysts that enable highly efficient photoenzymatic asymmetric catalysis using COFs as photocatalytic platforms for enzyme immobilization.
Article
Chemistry, Multidisciplinary
Cyrine Ayed, Jie Yin, Katharina Landfester, Kai A. I. Zhang
Summary: Using photocatalytic oxidation to convert basic chemicals into high value compounds in environmentally benign reaction media is a current focus in catalytic research. The challenge of gaining controllability over product formation selectivity was addressed by designing covalent triazine frameworks as recyclable photocatalysts. Controlled selectivity was achieved by activating or deactivating specific photogenerated oxygen species. This study demonstrates a promising approach for achieving switchable product formation selectivity for challenging oxidation reactions in pure water.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Sara Abednatanzi, Parviz Gohari Derakhshandeh, Sasanka Dalapati, Savita K. P. Veerapandian, Anne-Claire Froissart, Jan Dirk Epping, Rino Morent, Nathalie De Geyter, Pascal Van der Voort
Summary: A robust nanoporous covalent triazine framework has been developed as a metal-free catalyst for the green chemoselective reduction of nitroarenes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Ze Li, Mengyu Di, Yantao Zhang, Boying Zhang, Zhenni Zhang, Zhiwei Zhang, Aijun Li, Shanlin Qiao
Summary: Catalytic oxidation of styrene to benzaldehyde, an important process in industry and academia, often faces challenges in achieving high yield. In this study, a covalent triazine framework (CTF) loaded with Pd clusters was used as a catalyst for the oxidation reaction, resulting in a high product yield of 95%. The heteropore structure of the CTF anchored more exposed active sites, leading to excellent catalytic performance with high stability. The coordination of pyridine nitrogen atoms in the catalyst framework with Pd clusters improved chemical stability, while well-provided transport channels accelerated mass transfer between reactants and products.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Applied
Fatima Suarez-Blas, Marcos Martinez-Fernandez, Alejandro Prieto-Castaneda, Alba Garcia-Fernandez, Jose I. Martinez, Maria Mar Ramos, Maria J. Ortiz, Ramon Martinez-Manez, Jose L. Segura
Summary: In this work, a mixed linker strategy was developed to dop COF structures with BODIPY units, resulting in the synthesis of fluorescent Covalent Organic Nanosheets (CONs) with defined particle-size distribution of around 100 nm, which are suitable for cellular biomedical applications. The viability of the CONs was evaluated using Sk-Mel-103 cells, demonstrating 100% cell viability after internalization. We anticipate that this work could expedite the discovery of new COF-based materials for biomedical sciences.
Article
Chemistry, Multidisciplinary
Zhenjie Mu, Yuhao Zhu, Yufeng Zhang, Anwang Dong, Chunyan Xing, Ziru Niu, Bo Wang, Xiao Feng
Summary: The pore environment and aggregated structure of porous materials are crucial for their properties, especially mass transfer. In this study, a COF-to-COF transformation method was used to prepare microtubular COFs. This transformation was achieved by decomposing C-3-symmetric guanidine units into C-2-symmetric hydrazine units, resulting in crystal transformation of COFs. The hierarchical structure obtained with varying reaction times led to enhanced mass transfer properties, as demonstrated by adsorption measurement and chemical catalytic reactions. This self-template strategy was also successfully applied to four other COFs with different building units.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Energy & Fuels
Beatriz Fuerte-Diez, Antonio Valverde-Gonzalez, Mercedes Pintado-Sierra, Urbano Diaz, Felix Sanchez, Eva M. Maya, Marta Iglesias
Summary: Two new covalent triazine frameworks incorporating phenyl extended naphthalene units have been prepared using thermal and microwave activation. These frameworks show similar chemical structures but exhibit differences in morphology, structural organization, CO2 adsorption capacity, and thermal and optical properties. Additionally, the presence of methoxy groups in the naphthalene core has an influence on some of these properties. The resulting phenyl extended naphthalene CTFs are utilized as metal-free heterogeneous photocatalysts for selective reactions under visible-light irradiation, demonstrating high chemical stability.
Article
Energy & Fuels
Weili Jiang, Jicong Li, Mengying Wu, Limei He, Guanglin Zhou, Zhongrong Wang
Summary: Three kinds of porous organic polymers (POPs) containing N or P atoms were prepared and used as supports for Rh catalysts. The structures and compositions of these polymers were fully characterized. The Rh-N-POP showed a larger BET surface area and pore volume due to the bulk extrusion of triphenylphosphine (TPP) unit. The hydroformylation activity was promoted by the presence of free ligands in Rh-N-POP, but isomerization was greatly promoted by the TPP structure.
Review
Chemistry, Multidisciplinary
Andree Iemhoff, Maurice Vennewald, Regina Palkovits
Summary: Heterogeneous single-site and single-atom catalysts are promising for combining the advantages of molecular catalysts and solid catalysts. Covalent triazine frameworks (CTFs) have been studied as support materials for coordinating and stabilizing metal species, serving as model systems for understanding the interactions between different metal species and the supports.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Multidisciplinary
Dafeng Yan, Chalachew Mebrahtu, Shuangyin Wang, Regina Palkovits
Summary: Renewable H-2 production by water electrolysis has received much attention, but the energy consumption of conventional water electrolysis is high. This review summarizes the latest findings on innovative electrochemical strategies for H-2 production, including the use of redox mediators and alternative anodic reactions. The study also presents electrochemical H-2 production at both the cathode and anode, as well as the challenges and prospects for future development.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Jamal Abdul Nasir, Jingcheng Guan, Thomas W. Keal, Alec W. Desmoutier, You Lu, Andrew M. Beale, C. Richard A. Catlow, Alexey A. Sokol
Summary: This study investigates the NH3-SCR reaction mechanism on Cu-CHA catalyst using QM/MM technique and examines the effects of solvent on the reactivity of active Cu species. The results reveal that solvent promotes the oxidation component of the NH3-SCR cycle but inhibits the reduction component. Experimental and calculated spectroscopic analysis identify the existence of important species such as Cu-nitrate and Cu-nitrosamine. These findings contribute to a detailed understanding of the NH3-SCR kinetics.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Joby Sebastian, Chalachew Mebrahtu, Regina Palkovits
Summary: Titania supported MoOx catalysts with varying surface densities of Mo were examined for the DODH reaction of 1,4-AHE. Isolated MoOx species were found to be more active than oligomeric/polymeric/crystalline MoOx species. The increase in Mo surface density resulted in strong acidity, favoring side reactions.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Jingcheng Guan, You Lu, Kakali Sen, Jamal Abdul Nasir, Alec W. W. Desmoutier, Qing Hou, Xingfan Zhang, Andrew J. J. Logsdail, Gargi Dutta, Andrew M. M. Beale, Richard W. W. Strange, Chin Yong, Paul Sherwood, Hans M. M. Senn, C. Richard A. Catlow, Thomas W. W. Keal, Alexey A. A. Sokol
Summary: Vibrational spectroscopy is crucial for characterizing chemical systems, and recent theoretical developments in the ChemShell computational chemistry environment are reported to aid the interpretation of experimental infrared and Raman spectra. Computational vibrational intensities were calculated using a hybrid quantum mechanical and molecular mechanical approach, providing more realistic vibrational signatures for various materials and molecular systems. The efficient task-farming parallelism implemented in ChemShell on high-performance computing platforms enabled this work. This article is part of a discussion meeting issue on supercomputing simulations of advanced materials.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Chemistry, Physical
Zonghang Li, Xiaohu Yi, Qiwen Wang, Yiming Li, Diantao Li, Regina Palkovits, Anna Katharina Beine, Chunguang Liu, Xiaohong Wang
Summary: This study achieved the direct conversion of cellulose to glycolic acid (GA) with a high yield of up to 75% using acidic/redox polyoxometalates (POMs) as catalysts in a one-pot reaction. Among the three POMs studied, H3PMo showed the most promising catalytic activity. The reaction pathway involves the activation of O2 and the crucial role of the reduced form [PMo10 VIMo2VO39]5- in GA production.
Editorial Material
Electrochemistry
Sonja D. Murtz, Florian Musialek, Norbert Pfander, Regina Palkovits
Summary: The Front Cover of this issue features the research findings of Prof. Regina Palkovits' group, showcasing an artistic close-up of an electrochemical cell demonstrating the oxidation of glycerol for efficient hydrogen production. The research article focuses on investigating the PtCu catalyst, which is visible in the zoom window in the upper part of the image. Read the full text of the Research Article at 10.1002/celc.202201114.
Article
Electrochemistry
Sonja D. Muertz, Florian Musialek, Norbert Pfaender, Regina Palkovits
Summary: In this study, PtCu/C catalysts with different metal ratios were investigated for glycerol electrooxidation in acidic media. The addition of Cu to the benchmark Pt/C catalyst increased the activity, productivity, as well as stability due to electronic and structural effects. The best performer Pt7Cu3/C showed an increase in mass activity of 56%. The combined methodology of comprehensive electrochemical characterization and application in electrolysis experiments provides a practical approach for improving glycerol assisted hydrogen production addressing major challenges such as CO poisoning and stability.
Review
Multidisciplinary Sciences
Naomi E. Omori, Antonia D. Bobitan, Antonis Vamvakeros, Andrew M. Beale, Simon D. M. Jacques
Summary: XDS-CT is a non-destructive chemical imaging technique that provides reconstructions of sample cross-sections with spatially resolved chemical information. Recent advances in instrumentation and data reconstruction have led to the use of related techniques like small angle X-ray scattering CT and pair distribution function CT. Machine learning techniques have also disrupted how XDS-CT data is processed.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Electrochemistry
Maike Berger, Ioana M. Popa, Leila Negahdar, Stefan Palkovits, Bastian Kaufmann, Moritz Pilaski, Harry Hoster, Regina Palkovits
Summary: Nickel-iron layered double hydroxides (NiFe LDH) are efficient electrocatalysts for alkaline oxygen evolution reaction (OER). This study investigated the kinetic behavior of NiFe LDH catalysts with different intercalated anions using steady-state Tafel plots, impedance measurements, and reaction order plots. The results showed that intercalated anions affect the rate-determining steps and have a significant impact on the OER activity.
Article
Chemistry, Multidisciplinary
Micjel Chavez Morejon, Nils Kurig, Yannick S. Tschauder, Falk Harnisch, Regina Palkovits
Summary: This study elucidates key parameters allowing the electrochemical valorization of cellobiose, by creating value-added products by both, anodic oxidation, and cathodic reduction. The first electrochemical reduction of cellobiose to cellobitol was achieved in a divided cell using Pb as cathode, with a conversion rate of up to 49% but with long reaction times (over 26 h) and low coulombic efficiency (4%). The successful synthesis of cellobionic acid was demonstrated by mediated oxidation in an undivided electrochemical cell, with cellobiose oxidation highly selective, achieving up to 92% conversion at 48% coulombic efficiency when using a charge of 2 FE.
Article
Chemistry, Multidisciplinary
Justus Kuemper, Jerome Meyers, Rebecca Sebers, Nils Kurig, Regina Palkovits
Summary: Acrylonitrile is an important industrial chemical produced by the SOHIO process using fossil resources. To achieve sustainable production, a new route using biogenic substrates and electrolysis is proposed. The electrochemical synthesis of green acrylonitrile using d,l-glutamic acid as a substrate is achieved through electro-oxidative decarboxylation and non-Kolbe electrolysis, resulting in a two-step process with a maximum yield of 41.1%.
Article
Chemistry, Physical
Ariel A. Schoenberger Alvarez, Can Oezyalcin, Tom Padeken, Peter Mauermann, Bastian Lehrheuer, Stefan Sterlepper, Ahed Abouserie, Maurice Vennewald, Ulrich Simon, Regina Palkovits, Stefan Pischinger
Summary: This study investigates the influence of the NO2/NOx ratio on the formaldehyde-related effects using a copper exchanged chabazite type zeolite production catalyst under close to real conditions. The results show that formaldehyde preferentially reacts with NH3 under the chosen reaction conditions, leading to the formation of an intermediate that may undergo either catalytic decomposition or thermal decomposition depending on the NO2/NOx ratio. The presence of formaldehyde improves the NOx conversion efficiency at high NO2 fractions but deteriorates it at small NO2/NOx fractions.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Nina M. Sackers, Andree Iemhoff, Philippe Sautet, Regina Palkovits
Summary: Computational methods were used to investigate well-defined and characterized isolated Ir sites anchored on a covalent triazine framework (CTF) as a showcase for experimentally accessible single-site catalysts. The resting states of the catalyst species after immobilization and after reduction at 400 ? were identified, and they were found not to be the catalytically active species but rather pre-catalysts for the dehydrogenation of formic acid.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Antonio Iborra-Torres, Matej Hus, Kiem Nguyen, Antonis Vamvakeros, Muhammad Tariq Sajjad, Steven Dunn, Myrjam Mertens, Simon Jacques, Andrew M. Beale, Blaz Likozar, Geoffrey Hyett, Suela Kellici, Vesna Middelkoop
Summary: Organic pollutants in water are a major concern and urgent attention is required. In this study, 3D printed structures of SrNbO2N were developed for photocatalytic degradation of organic pollutants in water. The 3D printed material showed excellent photocatalytic activity and stability, attributed to its high adsorption towards methylene blue and efficient charge transfer. Time-Dependent Density Functional Theory calculations were performed to understand the photocatalyst structure and degradation pathways.
MATERIALS ADVANCES
(2023)
Article
Chemistry, Applied
Lulu Wan, Gan Ye, Yuying Chang, Zhaohan Yang, Guangming Shi, Qiuli Zhang, Jin Wang
Summary: This study developed an efficient approach to upgrade the oxidative desulfurization (ODS) performance of Zr-MOFs with proton stimulation. Experimental results showed that the introduction of protons can significantly improve the ODS efficiency. This work provides a facile and efficient strategy for enhancing the ODS performance of pristine MOFs.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Qiqi Lu, Xiu-Zhi Wei, Qi Zhang, Xinghua Zhang, Lungang Chen, Jianguo Liu, Yubao Chen, Longlong Ma
Summary: The application of Pd-M bimetallic clusters in the selective hydrogenation reaction was investigated, and the Pd0.6Ni@S-1 catalyst was found to exhibit high selectivity in the conversion of phenylacetylene to styrene. The confinement effect of zeolite inhibited over-hydrogenation and improved the stability of the catalysts. Furthermore, the solvent properties also influenced the product distribution.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Review
Chemistry, Applied
Bo Li, Lumin Hong, Changdi Jing, Xianyang Yue, Huabo Huang, Qianqian Jiang, Jianguo Tang
Summary: MOF materials with adjustable pore structure and polymetallic sites have been explored as electrocatalysts for OER. Bimetallic materials show higher electrocatalytic activity than monometallic materials, while carbon-coated and doped MOF catalysts exhibit stable and good OER activity. The synergistic interaction between polymetallic active sites effectively improves the intrinsic activity of MOF on OER.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Shichun Gu, Ruyi Wang, Junxiong Zhang, Hairong Dong, Liping Deng, Xue Wang, Yapeng He
Summary: In this study, monodispersed hollow mesoporous organosilica nanospheres with controlled core cavity and mesoporous shell were successfully synthesized. These hollow nanospheres showed a high adsorption capacity for Pb2+ in water solution and exhibited acceptable recycling and stability.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Lucie Havelkova, Bogdana Bashta, Michaela Vankova, Jiri Zednik, Jiri Brus, Jan Svoboda, Alice Vagenknechtova, Jan Sedlacek
Summary: An atom-economic one-step chain-growth coordination homopolymerization providing high yields of functionalized hyper-cross-linked polyacetylenes with a permanent micro/mesoporous texture and a BET area of up to 1062 m2/g is reported. The homopolymerization is highly compatible with the heteroatom groups of the monomers and allows the preparation of well-defined porous networks with a wide spectrum of univalent groups.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Shirui Pang, Yuxin Liu, Zhe Zhang, Yuxin Li, Chunguang Li, Zhan Shi, Shouhua Feng
Summary: This study focuses on using a functional separator to suppress the shuttle effect of soluble lithium polysulfides in Li-S batteries. It is found that the functionalized sulfonic acid group not only accelerates the conduction of lithium ions, but also repels polysulfide anions through electrostatic interactions. The performance of the batteries is significantly improved with the use of this functionalized separator.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Pingping Li, Lei Han, Donghun Kim, Kemal Celebi
Summary: This study presents a fast synthetic strategy for the preparation of high-quality platelike MFI crystals using a thin-wall tubular reactor. The strategy is efficient, time-saving, and can be optimized, making it applicable to the preparation and optimization of other important materials.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Haitao Yin, Wei Wang, Yuxin Li, Hu Wen, Shuang Chen, Nanzhe Jiang
Summary: This study presents a template-free and solid-state-like crystallisation method for the synthesis of ZSM-5 zeolite, which can be scaled-up in production. Mechanical mixing of starting material components improves the dispersion of materials, leading to ZSM-5 zeolite with high crystallinity and size uniformity.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Congli Li, Jiang Wang, Zhenfei Wang, Jinxiang Dong, Qi Shi
Summary: This study investigates the evolution and autoreduction behavior of Cu species in CuCl/NaY adsorbent during vacuum thermal activation. It is found that Cu species migrate from supercages to the nearby plane of the six-membered ring connecting the supercage and sod cage during vacuum activation. At 150 degrees C, vacuum autoreduction occurs, resulting in the formation of Cu+Cl- species. The results provide reference for the preparation of pi-complex adsorbents.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Irena Khatrin, Iman Abdullah, Alan J. Mccue, Yuni K. Krisnandi
Summary: Hierarchical porous system with two types of mesopores provides a solution to the diffusion limitation in conventional zeolites. Cobalt oxide impregnated hierarchical ZSM-5 zeolite samples with intra- and inter-crystalline mesopores were synthesized using two different strategies. The physicochemical properties of the modified catalysts were analyzed, revealing distinct features given by the two mesoporous configurations. Catalytic activity analysis showed that Co-oxide/ZSM-5 with inter-crystalline mesopores exhibited higher activity in methane partial oxidation reaction compared to Co-oxide/ZSM-5 with intra-crystalline mesopores.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Nataliia Reinders, Martin Durovic, Pavla Honcova, Zaneta Dohnalova, Jana Luxova, Stanislav Slang, Jhonatan Rodriguez-Pereira, Petra S. Sulcova
Summary: This study presents a new method for preparing a microporous Ni2P/C catalyst with high catalytic activity. The redox reaction and carbon matrix formation during high-temperature treatment contribute to the stability and activity of the catalyst. Experimental and analytical results suggest that the microporous structure of the composite plays a crucial role in its catalytic performance. These findings are important for practical applications of efficient hydrogen production by water electrolysis.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Ana Raquel Bertao, Viktoriya Ivasiv, Cristina Almeida-Aguiar, Patricia R. Correia, Antonio M. Fonseca, Manuel Banobre-Lopez, Fatima Baltazar, Isabel C. Neves
Summary: This study developed a zeolite-based delivery system (ZDS) using silver and 5-Fluorouracil as antimicrobial and antineoplastic agents. The ZDS was characterized and its antimicrobial properties were investigated, showing better antibacterial effectiveness for the ZDS containing both silver and 5-FU.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Naonobu Katada, Nobuki Ozawa, Etsushi Tsuji, Keigo Kanehara, Akiho Otsuka, Taiga Sakamoto, Kirari Umezawa, Hitoshi Matsubara, Satoshi Suganuma, Momoji Kubo
Summary: First principles calculations were used to investigate the pathway for methylation of benzene with methane catalyzed by MFI type zeolite-supported Co species. The strong adsorption of benzene on Co is found to lower the activation energy for methane dissociation and promote the formation of toluene precursor. The activation energy of methane dissociation is also affected by the Al-Al distance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Yuan Liu, An T. Ta, Kyoung Chul Park, Shenyang Hu, Natalia B. Shustova, Simon R. Phillpot
Summary: We use density functional theory to investigate the interactions of cerium, americium, and curium cations with crown ethers. Our results demonstrate that crown ethers can capture cerium, americium, and curium ions, and modifying the crown ether structure by substituting nitrogen atoms for oxygen atoms significantly increases their binding energies with radionuclides.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Zhengwu Peng, Shixing Wang, Yihui Wu, Xiang Liu, Hongliang Liu, Dekun Zhang, Likang Fu
Summary: An efficient adsorbent for recovery of germanium was prepared and characterized in this study. The adsorption behavior of Ge(IV) on the adsorbent was analyzed, and the results showed that it follows pseudo-secondary kinetic model and Langmuir isotherm model. The adsorbent exhibited good anionic anti-interference ability and can still maintain high adsorption efficiency after repeated adsorption.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
