Article
Chemistry, Applied
Xiuli Shao, Siqi Wang, Youhui Zhou, Xuan Zhang, Haizhou Tian, Zheng Wang, Zhong-Yong Yuan, Huanting Wang
Summary: This study demonstrates a tailored synthesis of multilamellar ZSM-5 zeolite composed of orderly stacked 2D nanosheets using silicalite-1 seed sol and CTAB. The hydrophobic tail of CTAB acts as an inhibitor to control the growth of nanosheets. This crystallization strategy offers a facile and inexpensive approach for fabricating multilamellar ZSM-5 zeolite with 2D-nanosheets structures.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
T. Onfroy, Z. Qin, S. Casale, V. Valtchev
Summary: Preparation of hierarchical zeolites through chemical etching is a popular research topic due to its significant improvement on diffusive properties and catalytic activity of microporous materials. This study optimizes the NH4F etching process by using less concentrated solutions and milder conditions, demonstrating the possibility of softening the post-treatment conditions by adjusting synthesis parameters such as NH4F/ZSM-5 ratio, etching time, and initial NH4F concentration, resulting in the generation of mesopores with different diameters.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Risheng Wang, Zhihua Peng, Pingping Wu, Jinzhi Lu, Mark J. Rood, Hongman Sun, Jingbin Zeng, Youhe Wang, Zifeng Yan
Summary: Soft template designing is a promising approach for the synthesis of zeolite nanosheets, with the use of s-triazine-based surfactant leading to the successful synthesis of a nanosheet-stacked hierarchical MFI zeolite with high surface area and abundant mesopores. The synthesized NSHM showed a significant increase in yield in the oxidation of cyclohexane compared to traditional supports.
CHEMISTRY-A EUROPEAN JOURNAL
(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, Multidisciplinary
Ning Wei, Weiping Zhang, Dazhi Zhang, Shengjun Huang
Summary: The synergistic effect between hierarchical zeolites and alumina in the preparation of active Mo catalysts for the cross-metathesis reaction between ethene and 2-butene was demonstrated. The metathesis activity, as indicated by ethene conversion, increased from 24.1% to 49.2% with increasing alumina content in the composites from 10 wt% to 30 wt%. However, a further increase in alumina content led to a reduction in metathesis activity.
Article
Chemistry, Physical
Yuan Hu, Yuan-Yuan Yue, Chan Wang, Hai-Bo Zhu, S. Ted Oyama, Xiao-Jun Bao
Summary: PK3 acts as a multifunctional template for synthesizing single-crystal hierarchical zeolites, inhibiting crystal growth to form nanocrystals, and eventually forming single-crystal zeolite particles. The easy removal of PK3 with simple acid treatment enables a nitrogen-/halogen-free and combustion-free route for hierarchical zeolite synthesis.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Lucie Desmurs, Claudia Cammarano, Gaetan Ramona, Robin Gaumard, Tzonka Mineva, Alexander Sachse, Jean-Dominique Comparot, Thomas Cacciaguerra, Didier Cot, Olinda Gimello, Anne Galarneau, Vasile Hulea
Summary: This study prepared mesoporous ZSM-5 catalysts using a 2-step micelle-templating procedure and varying the NaOH/Si synthesis ratio. The catalysts obtained showed different textural and acidic properties, with reduced acidity but higher mesopore volume. By testing two reactions, the best compromise was found for micro-/mesoporous ZSM-5 catalysts prepared with the ratio 0.38, which showed good accessibility for bulky molecules and specificity for Bronsted acid sites.
Article
Chemistry, Multidisciplinary
Guangrui Chen, Junyan Li, Sen Wang, Ji Han, Xingxing Wang, Peihong She, Weibin Fan, Buyuan Guan, Peng Tian, Jihong Yu
Summary: We present an anisotropic-kinetics transformation strategy for preparing single-crystalline aluminosilicate MFI zeolites with highly open nanoarchitectures and hierarchical porosities. The strategy involves in situ etching and recrystallization of pure-silica MFI zeolite nanotemplates under hydrothermal conditions. The resulting ZSM-5 nanocages exhibit enhanced catalytic lifetime and lower coking rate in the methanol-to-hydrocarbons reaction compared to conventional microcrystals and nanocrystals.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Qingpeng Cheng, Guanna Li, Xueli Yao, Lirong Zheng, Junhu Wang, Abdul-Hamid Emwas, Pedro Castano, Javier Ruiz-Martinez, Yu Han
Summary: This study presents a facile synthesis strategy for incorporating more Fe into the zeolite framework. The Fe-ZSM-5 catalyst prepared using this method has three times as many active sites as conventional Fe-ZSM-5, leading to a record-high C-1 oxygenate yield in the selective oxidation of CH4.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Applied
Yuyan Zhang, Mariya Shamzhy, Martin Kubu, Jiri Cejka
Summary: Zeolites can efficiently and selectively catalyze the hydroamination of alkenes, alkynes, and dienes due to their pore system and tunable acidity. This study investigated the activity of hierarchical micro-mesoporous zeolites in the hydroamination reaction and found that nanosponge MFI zeolite displayed the highest activity and yield.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Rusi Peng, Shiqing Li, Zheng Wan, Zhi-Qiang Wang, Xiaomeng Si, Jie Tuo, Hao Xu, Yejun Guan, Jingang Jiang, Yanhang Ma, Xiao He, Xue-Qing Gong, Peng Wu
Summary: A highly a-axis-oriented nanosheet zeolite with great industrial applications potential was synthesized using ionic liquid molecules and layered silicate sources. The resulting a-oriented ZSM-5 showed enhanced propylene selectivity and longer lifetime in the methanol-to-propylene reaction compared to bulky crystals. This research provides a versatile protocol for designing and synthesizing shape-selective zeolite catalysts with promising applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Pan Li, Angxi Li, Renjie Ruan, Yingxiong Guo, Qian He, Wenhong Zou, Linxi Hou
Summary: An eco-friendly strategy using asymmetrical anionic-nonionic gemini surfactants has been developed for the synthesis of hierarchical ZSM-5 zeolites with substantial mesoporosity. The gemini surfactants can effectively control the pore structure of the zeolites, resulting in improved catalytic performance and stable Mo-O bonding for immobilizing molybdenum compounds. The complex with intercrystal mesopores exhibited superior catalytic performance in epoxidation reactions, showing high yield and selectivity, even after repeated use.
Article
Chemistry, Multidisciplinary
Xiaoliang Liu, Jing Shi, Guang Yang, Jian Zhou, Chuanming Wang, Jiawei Teng, Yangdong Wang, Zaiku Xie
Summary: The morphology of zeolites plays a crucial role in determining their catalytic activity, selectivity, and stability, but it is challenging to define quantitative descriptors for this morphology effect. By introducing a new descriptor, the study successfully explains the morphology effect of sheet-like zeolites in C-4 olefin catalytic cracking, leading to improved catalytic activity and stability in samples with longer c-axis lengths. Time-resolved in-situ FT-IR spectroscopy and molecular dynamics simulations provide mechanistic insights for designing highly effective zeolite catalysts for olefin cracking.
COMMUNICATIONS CHEMISTRY
(2021)
Article
Chemistry, Applied
Jungkuk Lee, Kevin Giewont, Junjie Chen, Chih-Han Liu, Eric A. Walker, ELeni A. Kyriakidou
Summary: Ag ion-exchanged ZSM-5 zeolites show enhanced adsorption capacities for C2H4 and C7H8, with the presence of H2O impacting adsorption. Increasing Ag loading leads to higher adsorption capacities for both C2H4 and C7H8.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Geochemistry & Geophysics
Rebecca Gruen, Constantino Grau Turuelo, Sebastian Ehrling, Cornelia Breitkopf
Summary: Transient uptake curves for propane gas in a bed of HZSM-5 were obtained using a volumetric frequency response setup. Micropore diffusion was identified as the rate-determining process in the presented case.
Article
Electrochemistry
Xin Zhou, Nikita Denisov, Gihoon Cha, Imgon Hwang, Patrik Schmuki
Summary: This study compares the photoresponse of vertically erected single crystal anatase layers with that of TiO2 nanotube layers, showing that the de-fluorinated VE-anatase layers exhibit significantly higher photocurrents due to faster electron transport in these single crystal electrodes.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Electrochemistry
Nikita Denisov, Xin Zhou, Gihoon Cha, Patrik Schmuki
Summary: The photoresponse of TiO2 nanotube photoanodes is significantly influenced by the illumination intensity, with a significant increase in IPCE magnitude as the illumination intensity decreases. Higher illumination intensities lead to hole accumulation and trapping. At low light intensities, there are noticeable changes in IPCE spectra and a slowing of transient photocurrent kinetics.
ELECTROCHIMICA ACTA
(2021)
Article
Food Science & Technology
Morten Christiansen, Gregory N. Smith, Erik S. Brok, Martin Schmiele, Lilia Ahrne
Summary: This study investigated the effects of heat treatment and concentration on the structure and viscosity of skim milk concentrates prepared using reverse osmosis membrane filtration. The results showed that increased viscosity of the concentrates was attributed to increased aggregation of casein micelles and smoothening of their surface due to water removal and heat-load.
FOOD RESEARCH INTERNATIONAL
(2021)
Article
Chemistry, Physical
Lukas Zdrazil, Sergii Kalytchuk, Michal Langer, Razi Ahmad, Jan Pospisil, Oldrich Zmeskal, Marco Altomare, Andres Osvet, Radek Zboril, Patrik Schmuki, Christoph J. Brabec, Michal Otyepka, Stepan Kment
Summary: Luminescent solar concentrators (LSCs) have high potential for generating electricity by redirecting solar light to photovoltaic cells; the key challenge lies in replacing toxic, lead-containing perovskites with lead-free PNCs, such as Bi-doped Cs2Ag0.4Na0.6InCl6 double perovskites, to maintain high optical efficiency. The study demonstrates significant promise of Bi-doped lead-free PNCs for LSCs, with potential efficiency of 39.4% for larger scale LSCs.
ACS APPLIED ENERGY MATERIALS
(2021)
Editorial Material
Dermatology
Fouad Mitri, Ferdinand Toberer, Alexander H. Enk, Martin Hartmann
ACTA DERMATO-VENEREOLOGICA
(2021)
Article
Chemistry, Multidisciplinary
Zhenni Wu, Imgon Hwang, Gihoon Cha, Shanshan Qin, Ondrej Tomanec, Zdenek Badura, Stepan Kment, Radek Zboril, Patrik Schmuki
Summary: Anodic TiO2 nanotubes are shown to have excellent properties for harvesting Pt single atoms from highly dilute solutions. The tube walls provide suitable trapping sites for Pt SAs, and a high activity for photocatalytic H-2 generation can be achieved by immersing the nanotubes in a low concentration Pt solution. Overall, these findings demonstrate the potential of anodic TiO2 nanotubes for efficient Pt extraction and recovery, leading to highly active photocatalysts.
Article
Chemistry, Multidisciplinary
Shanshan Qin, Lancang Shui, Benedict Osuagwu, Nikita Denisov, Alexander B. Tesler, Patrik Schmuki
Summary: The study suggests that octahedral nanocubes with abundant {101} facets in anatase TiO2 nanocrystals produce over 4 times more H2 in photocatalytic H2 evolution compared to nanosheets enriched in {001} facets under co-catalyst-free conditions. However, when samples carry Pt co-catalyst on both {001} and {101} facets, the significance of faceting diminishes, indicating that the beneficial role of faceting is relevant only for co-catalyst-free surfaces.
Article
Energy & Fuels
Shanshan Qin, Nikita Denisov, Johannes Will, Jan Kolarik, Erdmann Spiecker, Patrik Schmuki
Summary: Removing non-active Pt SAs on TiO2 by cyanide leaching dramatically increases the co-catalytic activity of remaining Pt SAs, achieving a remarkable turnover frequency of 4.87 x 10(5) h(-1) for H-2 evolution.
Article
Chemistry, Multidisciplinary
Stephan Glante, Dorothea Wisser, Martin Hartmann, Markus Joos, Robert E. Dinnebier, Sebastian Bette
Summary: Zeolitic imidazolate frameworks (ZIFs) are an important subgroup of metal-organic frameworks (MOFs). Different morphologies and products of yqt-type ZIF phases can be obtained by reacting methylimidazole (Hmim) with zinc salts in aqueous solution. A series of isostructural compounds can be obtained by thermal dehydration of the hydrated ZIF phases. The products were characterized using X-ray powder diffraction (XRPD) and vibrational (IR) and two-dimensional (2D) solid-state nuclear magnetic resonance (NMR) spectroscopy. Zinc exhibits tetrahedral coordination and forms a yqt net in all structures. Inorganic anions are incorporated into this net as Zn-X-Zn bridges and have a significant impact on de- and rehydration behavior and thermal expansion.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Energy & Fuels
Amer Inayat, Alexandra Inayat, Wilhelm Schwieger, Barbora Sokolova, Pavel Lestinsky
Summary: This study investigates the thermo-catalytic pyrolysis of LDPE using HZSM-5 catalysts with different acid site densities. The results show that the catalyst with the highest acid site density produces the highest concentration of aromatics, while the catalyst with the lowest acid site density produces the highest concentration of C-2-C-4 olefins. These findings are important for the chemical recycling of plastic wastes.
Article
Chemistry, Applied
Ameen Shahid, Alexandra Inayat, Yamini Avadhut, Martin Hartmann, Wilhelm Schwieger
Summary: Zeolites are important catalysts in the chemical industry, but their narrow micropore system limits mass transport. Introducing a second larger pore system through desilication can overcome these limitations. The influence of framework topology on the formation of mesoporosity by desilication was investigated, and it was found that cage-like zeolites are more susceptible to desilication.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Physical
Amara Nasir, Anca Mazare, Xin Zhou, Shanshan Qin, Nikita Denisov, Lukas Zdrazil, Stepan Kment, Radek Zboril, Tariq Yasin, Patrik Schmuki
Summary: This study presents a low-cost, one-step photocatalytic method for synthesizing graphene oxide (GO) using commercial graphite and grey TiO2. GO formation is achieved through UV illumination of a slurry containing well-dispersed grey TiO2 and commercial graphite. The resulting GO-decorated TiO2 acts as a visible-light-active photocatalyst for applications such as pollutant degradation.
Article
Chemistry, Multidisciplinary
Paolo Cleto Bruzzese, Enrico Salvadori, Bartolomeo Civalleri, Stefan Jaeger, Martin Hartmann, Andreas Poeppl, Mario Chiesa
Summary: By using EPR and HYSCORE spectroscopies along with ab initio calculations, we have determined the structure of framework-bound monomeric hydroxo-Cu-II in copper-loaded chabazite. The complex forms three coordinating bonds with zeolite lattice oxygens and interacts with the cage through hydrogen bonding.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Albert G. F. Machoke, Aurina Martinez Arias, Giulia Baracchini, Michael Rubin, Hasan Baser, Tobias Weissenberger, Roland Dittmeyer, Alfred Weber, Martin Hartmann, Wilhelm Schwieger
Summary: The combination of spray drying and steam-assisted crystallization (SAC) is effective in addressing the limitations of low yields, separation problems, and high amounts of waste in hydrothermal synthesis of nanosized zeolites. Through spray drying and SAC conversion, the amorphous material can be transformed into zeolite particles without the need for additional template at temperatures between 300 and 400 degrees C. Kinetic studies reveal that it takes 4 to 8 days to achieve 100% crystalline product formation. This work demonstrates the usefulness of spray drying and SAC as tools in supplementing the hydrothermal synthesis of nanosized zeolites.
Article
Chemistry, Multidisciplinary
Markus Schorner, Stefanie Kammerle, Dorothea Wisser, Benjamin Baier, Martin Hartmann, Matthias Thommes, Robert Franke, Marco Haumann
Summary: In this study, the continuous gas-phase aldol condensation reaction of n-pentanal on silica supports was investigated, revealing the influence of pore size on reaction activity and product accumulation.
REACTION CHEMISTRY & ENGINEERING
(2022)
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)
