Article
Chemistry, Inorganic & Nuclear
Zhongxu Wang, Peng Lu, Shuo Li, Yuling Shan, Lu Li, Xiaosheng Wang, Shuwei Liu, Lei Han, Shiwei Liu, Yuxiang Liu
Summary: A surface modification strategy is proposed to balance the contradiction between mesopore introduction and loss of microporosity in Beta molecular sieves. By selectively adsorbing organic alkaline molecules on the surface, the as-synthesized hierarchical Beta molecular sieves retain more acid sites and exhibit effective catalytic performance in the dehydration reaction of glucose.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Applied
Tao Zheng, Haiyan Liu, Peng He, Rui Zhang, Xianghai Meng, Chunming Xu, Hongtao Liu, Yuanyuan Yue, Zhichang Liu
Summary: This study investigates the influence of acid concentration on the physicochemical properties of SAPO-34 catalysts and elucidates the mechanism of selective desilication using different concentrations of citric acid solutions. The results show that the concentration of citric acid determines the manufacturing of hierarchical pore structure and the extraction of specific silicon species. The resistance of Si-O-Si and Si-O-Al bonds near or in different silicon species is responsible for the selective desilication by citric acid. The distribution of silicon species and the selective desilication have a coupling effect on the generation of secondary pores and the strength and amount of acid sites. The acid-treated SAPO-34 exhibits improved performance in the methanol-to-olefins reaction.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Review
Chemistry, Physical
Daniele S. Oliveira, Rafael B. Lima, Sibele B. C. Pergher, Vinicius P. S. Caldeira
Summary: Zeolites are of great interest due to their catalytic properties, but the size of their micropores limits their use with bulky molecules. Generating secondary porosity through alkaline treatment has gained attention for its simplicity, speed, and cost-effectiveness. This review highlights the importance of alkaline treatment, its parameters, and discusses the properties and catalytic performance of hierarchical zeolites prepared by this method.
Article
Engineering, Chemical
Rafael B. Lima, Miguel M. S. Neto, Daniele S. Oliveira, Anne G. D. Santos, Luiz D. Souza, Vinicius P. S. Caldeira
Summary: Efforts have been made to synthesize hierarchical zeolites through NaOH treatment, using cetyltrimethylammonium bromide as pore-directing agent. Results showed that microwave heating method generated narrower pore size distribution, leading to higher conversion rate and temperature reduction in ZSM-5 zeolites.
ADVANCED POWDER TECHNOLOGY
(2021)
Review
Chemistry, Inorganic & Nuclear
Lei Tan, Nianming Jiao, Xinrui Bai, Hongyan Wang, Jun Wang, Hui Wang, Xiangping Zhang
Summary: Zeolites are commonly used in petrochemical processes and refineries. However, the narrow microporous channels limit the diffusion of reactants and products. Chemical etching techniques, such as exposure to acids, alkalis, and neutral etchants, can introduce mesopores and macropores to enhance mass transfer and accessibility. This review summarizes and evaluates the chemical etching methods and their relevance to various catalytic reactions.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Engineering, Environmental
Zhaojin Lu, Xiaoyong Yang, Bingjie Wang, Hui Li, Zhishan Bai
Summary: This paper introduces a novel coalescence separation-depth adsorption (CS-DA) coupling dry separation technique for efficiently separating acid-hydrocarbon emulsions, aiming to replace the traditional alkaline washing-water washing (AW-WW) process and promoting clean alkylation production. The research findings show that the CS-DA coupling dry separation technique can effectively reduce the total sulfur content in the alkylation reaction products (ARP) and meet industrial standards, providing a promising alternative for the difficulties in emulsion treatment of high-temperature sulfuric acid alkylation.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Green & Sustainable Science & Technology
K. Yang, S. Yan, Y. Sang, J. Liu, L. Yu, X. Yang, S. Huang
Summary: The study introduces chelating agents into the alkaline treatment of ZSM-5 zeolite, resulting in a shift in mesopore distribution to smaller dimensions. The chelating agents participate in the transition by complexing with OH- anions and released aluminum cations, expanding the shielding scope on the etched surface/interface of the zeolite.
MATERIALS TODAY SUSTAINABILITY
(2021)
Article
Chemistry, Physical
Zifeng Guo, Meihua Hong, Yonghua Yu, Guanfeng Liu, Jiazong Zang, Dazhi Zhang, Huimin Gong, Keyu Yang, Shengjun Huang
Summary: The sequential fluorination-alkaline treatment protocol allows for the tailored growth of mesoporosity in siliceous ZSM-5 zeolite. The fluorination step alters the spontaneous growth of mesoporosity in alkaline medium, resulting in a delay in the growth time. The level of fluorination plays a role in either decelerating or enabling the development of mesoporosity. This is attributed to the changes in the states of Al sites as a result of fluorination. The interplay between fluorination and the alkaline medium is proposed to have electronic and steric effects on the environment of Al species.
Article
Chemistry, Applied
O. Zaitceva, B. Louis, V Beneteau, P. Pale, S. Shanmugam, E. Evstigneyev, A. V. Vasiliev
Summary: The addition of bio-sourced lignin residues in the alkaline desilication treatment induced the generation of supplementary mesoporosity in FAU zeolites, enhancing their efficiency as catalysts. This new design strategy offers a novel approach for the design of zeolite-based catalysts.
Article
Pharmacology & Pharmacy
Agata Wawrzynczak, Izabela Nowak, Natalia Wozniak, Jagoda Chudzinska, Agnieszka Feliczak-Guzik
Summary: This study focuses on the synthesis and characterization of hierarchical zeolites with secondary mesoporosity, using commercial zeolites and modified with polysaccharides. The materials were characterized and tested as carriers for bioactive molecules. Preliminary studies have shown the potential of hierarchical zeolites as carriers for different therapeutic molecules.
Article
Biochemistry & Molecular Biology
Zeinab Mcheik, Ludovic Pinard, Joumana Toufaily, Tayssir Hamieh, T. Jean Daou
Summary: Hierarchical MOR-type zeolites were synthesized using CTAB as a porogen agent, showing higher porous volume and BET surface area. Increasing CTAB concentration led to higher mesoporous volume and BET surface area, while preserving zeolite micropores. By reducing the aluminum content in the synthesis gel, the Si/Al ratio of the zeolite framework can be increased. These synthesized hierarchical MOR-type zeolites exhibited improved catalytic activity for n-hexane cracking compared to large zeolite crystals obtained without CTAB.
Article
Chemistry, Physical
Lei Han, Ruoyu Wang, Peng Wang, Aiguo Zheng, Yaoqing Guo, Yan Chen, Qiuqiao Jiang, Wei Lin
Summary: Researchers achieved the direct fabrication of hierarchical hollow Al-rich ZSM-5 zeolites by regulating Al distribution, resulting in hierarchical hollow nano ZSM-5 crystals with enhanced catalytic activities and selectivities.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Review
Chemistry, Applied
Gabriel Aguirre-Cruz, Felipe Legorreta-Garcia, Gael Aguirre-Cruz, Lia Stanciu, Gabriel Aguirre-Alvarez
Summary: Novel pure-silica hierarchical zeolite molecular sieves have shown great potential for adsorption and heterogenous catalysis. They surpass conventional zeolites in terms of diffusion and reusability. This review discusses various synthesis routes and methods for these materials, as well as their applications in catalysis and mass transport. The study also addresses the synthesis principles and mechanisms related to the production of mesoporous pure silica zeolites. These materials exhibit high catalytic activity and structural stability, making them an eco-friendly alternative to traditional catalytic platforms.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Physical
Sancler C. Vasconcelos, Luiz F. C. Pinhel, Vinicius G. C. Madriaga, Vinicius Rossa, Leyliane G. S. Batinga, Domingos S. A. Silva, Rodrigo D. dos Santos, Andre V. H. Soares, Ernesto A. Urquieta-Gonzalez, Fabio Barboza Passos, Rajender S. Varma, Thiago M. Lima
Summary: This study presents the synthesis of hierarchical beta and mordenite zeolites for the conversion of furfural into isopropyl levulinate. Beta zeolite treated with an alkaline solution exhibited larger mesopores and a higher Lewis/Bronsted ratio, resulting in improved diffusion and higher conversion and selectivity.
Article
Engineering, Chemical
Grandprix Thomryes Marth Kadja, Noerma Juli Azhari, St Mardiana, Munawar Khalil, Subagjo, Muhammad Haris Mahyuddin
Summary: Hierarchical ZSM-48 is synthesized at a faster rate by inducing the formation of hydroxyl radicals, leading to one-dimensional crystal growth and the formation of nanorod crystals, which facilitates the formation of larger aggregates and results in improved catalytic performance.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Editorial Material
Chemistry, Physical
Javier Perez-Ramirez, Bert M. Weckhuysen, Maria E. Southall
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Dario Poier, Sharon Mitchell, Victor Tulus, Gonzalo Guillen-Gosalbez, Javier Perez-Ramirez, Roger Marti
Summary: Scaling up syntheses from mg to kg quantities is a complex endeavor, which requires adaptation to industrial processes, equipment, safety assessments, and environmental impact reduction. Transition metal single-atom heterogeneous catalysts (SAC), as a novel class of catalytic materials, could be a key approach to replace single-use catalysts and address the challenges in large-scale synthesis.
Article
Chemistry, Multidisciplinary
Sebastiano C. D'Angelo, Antonio J. Martin, Gonzalo Guillen-Gosalbez, Javier Perez-Ramirez
Summary: Intense efforts have been devoted to developing green and blue centralised Haber-Bosch processes, but a decentralised and sustainable scheme has yet to be assessed. In this study, we reveal the conditions under which small-scale systems based on the electrocatalytic reduction of nitrogen (eN2R) powered by photovoltaic energy (NH3-leaf) could become a competitive technology in terms of environmental criteria. The disclosed sustainability potential of NH3-leaf makes it a strong ally of gHB toward a non-fossil ammonia production.
Article
Chemistry, Multidisciplinary
Zihao Zhang, Jinshu Tian, Xiangkun Wu, Ivan Surin, Javier Perez-Ramirez, Patrick Hemberger, Andras Bodi
Summary: Through operando synchrotron photoelectron photoion coincidence spectroscopy, we successfully detected short-lived free radicals and oxygenates produced by boron nitride (BN) catalyst in the oxidative dehydrogenation of propane (ODHP) reaction. We identified a gas-phase reaction route where partially oxidized enols enter the gas phase, undergo dehydrogenation (and methylation) to form ketenes, and finally produce olefins by decarbonylation. Quantum chemical calculations suggest that the >BO dangling site on the catalyst is the source of the free radicals. Additionally, the easy desorption of oxygenates from the catalyst surface is crucial to prevent deep oxidation to CO2.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Matteo Vanni, Vera Giulimondi, Andrea Ruiz-Ferrando, Frank Krumeich, Adam H. Clark, Sharon Mitchell, Nuria Lopez, Javier Perez-Ramirez
Summary: The lack of selective and stable catalysts hinders the practical implementation of CH2Br2 hydrodebromination to CH3Br. Palladium has potential as the most active metal for this reaction, but the tendency of metal nanoparticles to form C2+ products and methane limits its use. This study explores the impact of host effects on nanostructured palladium-based hydrodebromination catalysts, and identifies that stabilization of isolated Pd sites on carbon-based supports enables suppression of C-C coupling and promotes selective hydrogenation of the CH2Br* intermediate to CH3Br.
Article
Chemistry, Physical
Vera Giulimondi, Sharon Mitchell, Javier Perez-Ramirez
Summary: Controlling the electronic structure of transition-metal single-atom heterogeneous catalysts (SACs) is crucial for optimizing their potential in various applications. While several methods have been proposed to alter the electronic characteristics of SACs, the lack of a systematic approach hinders the control and understanding of their effects.
Article
Chemistry, Multidisciplinary
Cecilia Salah, Selene Cobo, Javier Perez-Ramirez, Gonzalo Guillen-Gosalbez
Summary: The increasing demand for single-use polymers requires the exploration of alternative waste treatment methods to achieve a circular economy. This study investigates the production of hydrogen from waste polymer gasification (wPG) as a means to reduce the environmental impact of plastic incineration and landfilling while generating valuable products. The carbon footprint and environmental sustainability of various H2 production routes, including wPG, natural gas, biomass, and water splitting, are assessed in relation to planetary boundaries. Results suggest that wPG combined with carbon capture and storage can effectively reduce the climate change impact compared to fossil-based and electrolytic routes. While the cost of wPG might be higher than fossil and biomass-based alternatives, it remains cheaper than electrolytic routes. Furthermore, a combination of pathways can meet the current global H2 demand without exceeding the studied planetary boundaries, indicating the potential role of H2 from plastics until chemical recycling technologies mature.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Thaylan Pinheiro Araujo, Jordi Morales-Vidal, Georgios Giannakakis, Cecilia Mondelli, Henrik Eliasson, Rolf Erni, Joseph A. Stewart, Sharon Mitchell, Nuria Lopez, Javier Perez-Ramirez
Summary: Ternary Pd-In2O3/ZrO2 catalysts prepared by wet impregnation exhibit selective and stable architecture under CO2 hydrogenation conditions, irrespective of the order of addition of Pd and In phases on the zirconia carrier. The rapid restructuring of the catalysts is driven by the metal-metal oxide interaction energetics. The presence of InPdx alloy particles decorated by InOx layers prevents performance losses associated with Pd sintering.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Lin Dong, Jordi Morales-Vidal, Lili Mu, Licheng Li, Nuria Lopez, Javier Perez-Ramirez, Zupeng Chen
Summary: In this study, an efficient selective synthesis of 5-Methylfurfural (MF) from 5-hydroxymethylfurfural (HMF) was achieved using an anatase-supported gold catalyst (Au/a-TiO2). The C-O bond was maintained during the hydrogenolysis of HMF, resulting in a high yield of 83.1% for MF. The superior performance of Au/a-TiO2 can be attributed to the high concentration of oxygen vacancies in the support, which limits H access, reduces reactant adsorption, and prevents condensation. This research highlights a new approach for the selective transformation of renewable compounds into high-value-added chemicals.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Multidisciplinary
Haibin Ma, Enric Ibanez-Ale, Ramesha Ganganahalli, Javier Perez-Ramirez, Nuria Lopez, Boon Siang Yeo
Summary: In this study, it was discovered that carbonate intermediates can be adsorbed on a copper electrode during electrochemical CO2 reduction reaction (eCO(2)RR) and can be reduced to formate. The nature of active sites and the mechanism for the reduction of carbonate to formate were also elucidated. These findings provide a potential pathway to mitigate carbonate formation during eCO(2)RR.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Vera Giulimondi, Andrea Ruiz-Ferrando, Georgios Giannakakis, Ivan Surin, Mikhail Agrachev, Gunnar Jeschke, Frank Krumeich, Nuria Lopez, Adam H. Clark, Javier Perez-Ramirez
Summary: This study demonstrates the bifunctionality of carbon supports and metal sites in the acetylene hydrochlorination catalytic cycle, and proposes potential binding sites for acetylene and a viable reaction profile. The results highlight the importance of optimizing both metal and support components for catalyst design.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yuzhen Ge, Tangsheng Zou, Antonio J. Martin, Javier Perez-Ramirez
Summary: This study investigates the impact of highly dispersed metal oxides of Co-Cu, Cu-Fe, and Co-Fe m-FTS systems on the direct synthesis of higher alcohols (HA) and demonstrates the viability of ZrO2 as a promoter. The addition of ZrO2 significantly increases HA productivity, with the Cu(1)Co(4)@ZrO2-5 catalyst exhibiting a 2.5-fold increase compared to its ZrO2-free counterpart. The Co1Fe4@ZrO2-10 catalyst shows the most productive performance among similar systems.
Article
Chemistry, Multidisciplinary
Phil Preikschas, Antonio J. J. Martin, Boon Siang Yeo, Javier Perez-Ramirez
Summary: Phosphate-derived nickel catalysts have been used to produce multicarbon products through CO2 electroreduction, but the effects of operating conditions on product formation are still unclear. In this study, refined H-1 NMR spectroscopy protocols were developed and combined with an automated NMR data processing routine to quantify carbon product formation under various parameters. The findings revealed performance trends in carbon product formation and identified four previously unreported compounds.
COMMUNICATIONS CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Manu Suvarna, Alain Claude Vaucher, Sharon Mitchell, Teodoro Laino, Javier Perez-Ramirez
Summary: In this study, a transformer model is introduced to automate synthesis protocol extraction from heterogeneous catalysis literature, showcasing the potential of using automated synthesis protocol analysis to expedite literature review and analysis in the field. The research also highlights the lack of standardization in reporting protocols and provides guidelines for improving machine readability.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Florentine L. P. Veenstra, Therese Cibaka, Antonio J. Martin, Daniel Weigand, Joachim Kirchhoff, Vladimir Smirnov, Tsvetelina Merdzhanova, Javier Perez-Ramirez
Summary: Artificial leaves can reduce carbon dioxide into syngas using solar power and have the flexibility to control the composition of the syngas by adjusting the electrolyte flow, which is beneficial for decentralized production.
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)