Article
Chemistry, Applied
Sen Wang, Zhikai Li, Zhangfeng Qin, Mei Dong, Junfen Li, Weibin Fan, Jianguo Wang
Summary: The catalytic performance of H-ZSM-5 zeolite for methanol-to-olefins conversion can be properly regulated by altering the distribution of acid sites within the zeolite framework, particularly the location of Al. Specifically, aromatic cycle and aromatization process preferentially occur at acid sites in the intersection cavities, while polymethylbenzene formation is suppressed at acid sites in the sinusoidal and straight channels. The alkene cycle, on the other hand, can take place at all three types of acid sites with similar energy barriers and probabilities.
CHINESE JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Mengya Xia, Qiaoxian Tong, Huai Sun, Yingxin Sun, Sheng Han, Qianggen Li
Summary: The reaction mechanisms of methanol to propene on a phosphorus-modified acidic FAU zeolite were studied using a two-layer ONIOM method. The potential energy surface analysis showed that the rate-determining steps differ for each pathway. The addition of phosphorus atoms to the zeolite decreases the energy barriers of the rate-determining steps. The electron migration direction and nature of the transition states were revealed by DCD, LOL, and RDG plots. The presence of van der Waals and weak covalent interactions were found in the transition state structures.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Physical
Jiaxing Zhang, Ajuan Zhou, Kaivalya Gawande, Guanxing Li, Shujie Shang, Chengyi Dai, Wei Fan, Yu Han, Chunshan Song, Limin Ren, Anfeng Zhang, Xinwen Guo
Summary: ZSM-5 nanosheets show promise as catalysts for diffusion-controlled catalytic reactions. In the alkylation of benzene with methanol, nanosheets with a thickness of 30 nm exhibit higher benzene conversion, xylene selectivity, and methyl selectivity, as well as a longer lifetime and lower ethylbenzene selectivity compared to nanosheets with a thickness of 300 nm. This is attributed to the shorter straight channel length, larger specific surface area, and increased mesopore volume of the nanosheets, which enhance the diffusion of reactants and products and decrease coke formation.
Article
Chemistry, Applied
Yilin Wang, Shufang Xu, Xuan He, Fan Yang, Xuedong Zhu
Summary: This study successfully synthesized MCM-22 zeolite with regulated acid sites and framework aluminum (AlF) siting, which enables good shape-selectivity for the alkylation of benzene with methanol. Decreasing acid sites in the supercages and external pockets helps mitigate coking and enhance the catalytic life and capacity of containing deposits.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Shujia Guo, Sen Wang, Li Zhang, Zhangfeng Qin, Pengfei Wang, Mei Dong, Jianguo Wang, Weibin Fan
Summary: Adding Na+ ions increases the concentration of acid sites in the intersection cavity of ZSM-5, promoting the production of ethene; on the other hand, a Na+ ions free synthesis system is more conducive to producing more propene and higher alkenes.
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
(2021)
Article
Multidisciplinary Sciences
Yanxia Guo, Sen Wang, Rui Geng, Pengfei Wang, Shiying Li, Mei Dong, Zhangfeng Qin, Jianguo Wang, Weibin Fan
Summary: Various FER zeolite nanosheets were prepared with different organic templates, and FER-MORP sample synthesized with morpholine showed the highest DME conversion and methyl acetate space-time yield. The study also revealed that morpholine can enhance the carbonylation activity and suppress the formation of coke species.
Article
Nanoscience & Nanotechnology
Zhongwen Dong, Chuanyu Yang, Dongpu Zhao, Yanan Wang, Weifeng Chu, Zhaochi Feng, Xiangxue Zhu, Wenjie Xin, Yongchen Shang, Shenglin Liu, Longya Xu
Summary: A new interzeolite transformation method has been developed for the quick synthesis of nanoaggregate catalyst CDM-5, where the formation process of ordered aluminosilicate aggregate species was revealed through UV-Raman spectra and HRTEM, SEM images.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Omar Abed, Hend Omar Mohamed, Idoia Hita, Vijay Velisoju, Natalia Morlanes, Omar El Tall, Pedro Castano
Summary: This study compares the effects of different catalyst structures on adsorption and catalysis, exploring the roles of pore topology, Ni sites, and acid sites. The results show that acid sites are particularly important during the initial stages of the reaction, and using a continuous reactor alone may lead to misinterpretation. Ni accelerates the reaction and improves the selectivity towards oligomers. Based on the experimental results, the dominant mechanisms over the different catalyst sites and reaction times are discussed.
Review
Chemistry, Multidisciplinary
Ana Palcic, Enrico Catizzone
Summary: Zeolites are efficient catalysts for methanol conversion reactions, with the crystal size affecting activity, product distribution, and coke deposition. Recent studies focus on the application of nanosized zeolites in MTD, MTO, and MTG processes, with critical discussion on product distribution, coke formation, and deactivation. Methods for preparing nanosized zeolites are mentioned, highlighting the impact of crystal size on zeolite-catalyzed methanol conversion reactions.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2021)
Article
Chemistry, Physical
Petr Klein, Jiri Dedecek, Haunani M. Thomas, Sarah R. Whittleton, Jiri Klimes, Jiri Brus, Libor Kobera, David L. Bryce, Stepan Sklenak
Summary: In this study, the siting and local structure of Na+ cations in Si-rich ferrierite zeolites were investigated using NMR spectroscopy and DFT. The results showed that the occupation of Na+ cationic sites is not determined by their relative energies, but by the kinetics of Na+ ion-exchange. Additionally, NMR spectroscopy alone can determine the ring forming the Na+ site, but cannot determine which T site is occupied by Al in that ring.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Fan Yang, Xianzhi Jia, Rui Xu, Lu Liu, Chengyi Dai, Binran Zhao
Summary: This study investigated the kinetics of methanol transformation to aromatics using a 3Zn-3Si/ZSM-5 catalyst for the selective production of p-xylene. The products were divided into four categories in the kinetic model, including methanol and dimethyl ether, alkanes and alkenes, aromatics (except p-xylene), and p-xylene. The kinetic study was conducted at temperatures ranging from 623.15 to 748.15 K. The kinetic model and its parameters were calculated using the Runge-Kutta method and the genetic algorithm. The obtained reaction rate constants and kinetic reaction equations provide valuable theoretical support for subsequent reactor simulation and design.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Physical
S. Hadi Alaei, Farhad Khorasheh, M. Reza Jafari Nasr, Mehdi Arjmand
Summary: Extensive experimental data were used to develop a comprehensive kinetic model for the methanol to propylene (MTP) process over a ZSM-5 catalyst. Preliminary experiments were performed to determine the reaction conditions that would ensure the absence of external and internal mass transfer resistances. The kinetic experiments were subsequently carried out at 420-500 degrees C under conditions where mass transfer limitations were absent. A detailed reaction network was proposed for the MTP process based on the experimental product distribution and various reported kinetic models in the literature.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Marie-Elisabeth M. L. Lissens, Pedro S. F. Mendes, Tingjun Lei, Maarten K. Sabbe, Joris W. Thybaut
Summary: The various reaction regimes in methanol to hydrocarbon conversion were experimentally assessed. A dynamic behavior was observed at low oxygenate conversion and low temperature, while increasing the temperature could bring the reaction to a steady-state regime. Further temperature increase resulted in deactivation.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Sheng Fan, Han Wang, Shipei He, Kai Yuan, Pengfei Wang, Junfen Li, Sen Wang, Zhangfeng Qin, Mei Dong, Weibin Fan, Jianguo Wang
Summary: The finding of methylcyclohexene as a crucial reaction intermediate in the conversion of methanol to light olefins (MTO) plays a vital role in understanding the MTO reaction mechanism and further research.
Article
Chemistry, Physical
Li Zhang, Sen Wang, Zhangfeng Qin, Pengfei Wang, Guofu Wang, Mei Dong, Weibin Fan, Jianguo Wang
Summary: This study investigated the formation and evolution of primary hydrocarbon pool (HCP) species in the methanol to olefins (MTO) process over H-ZSM-5 zeolite. It was found that MCPdienes are identified as the primary HCP intermediates in the early transition period of MTO, promoting the production of olefins.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Physical
Yanfeng Xue, Junfen Li, Pengfei Wang, Xiaojing Cui, Hongyan Zheng, Yulan Niu, Mei Dong, Zhangfeng Qin, Jianguo Wang, Weibin Fan
Summary: Regulating the Al distribution in zeolite through Sn leads to a more homogeneous spatial distribution, resulting in decreased formation of aromatics and coke species, and increased propene selectivity and catalytic stability in the MTO process.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Applied
Ying Shi, Qiuming Zhou, Zhangfeng Qin, Zhiwei Wu, Weiyong Jiao, Mei Dong, Weibin Fan, Jianguo Wang
Summary: Hierarchically structured Beta zeolites with high meso-porosity were synthesized through steam treatment using organosilanes as pore-forming reagents, followed by modification with K and Pt. The Pt/K-Beta-HS catalysts exhibited excellent performance in the aromatization of n-heptane, showing longer lifetime, higher selectivity to aromatics, and larger turnover numbers compared to conventional Beta zeolites. These results demonstrate the potential of Pt/K-Beta-HS zeolites as efficient catalysts for converting n-heptane to aromatics.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Li Yang, Chao Fan, Li Luo, Yanyan Chen, Zhiwei Wu, Zhangfeng Qin, Mei Dong, Weibin Fan, Jianguo Wang
Summary: The study revealed that dry ball-milling is a simple and effective method to prepare Pd/SiO2 catalysts for lean methane oxidation at low temperature, with palladium acetylacetonate being an ideal precursor. The oxidation state of Pd species plays a crucial role in determining the catalytic activity, and the PdOx/SiO2-Acac catalysts exhibit higher activity in this process.
Article
Engineering, Chemical
Shujia Guo, Sen Wang, Wenyu Zhang, Han Wang, Qian Zhang, Zhangfeng Qin, Mei Dong, Jianguo Wang, Weibin Fan
Summary: This research focuses on the direct formation of light olefins from CO2 hydrogenation. Bifunctional catalysts composed of zinc-based metal oxides and H-RUB-13 zeolite were prepared, and the selectivity of C2-4 olefins reached 64.7-83.2%. ZnZrOx/H-RUB-13 showed the highest CO2 conversion due to the presence of oxygen vacancies. Interestingly, propene and butene were the dominant hydrocarbons, indicating the potential of H-RUB-13 zeolite to suppress ethene formation. However, the distribution of light olefins also depended on the overall acidity of the bifunctional catalyst, with ZnCrOx/H-RUB-13 showing higher ethene selectivity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Applied
Ying Shi, Qiuming Zhou, Zhangfeng Qin, Zhiwei Wu, Weiyong Jiao, Mei Dong, Weibin Fan, Jianguo Wang
Summary: The catalytic performance of Pt/Beta-Me catalysts modified with different alkali metals in the aromatization of n-heptane was investigated. The results showed that the modification with alkali metals can enhance the Pt dispersion, suppress cracking reactions and carbonaceous deposition, and promote the dehydroaromatization of alkanes, leading to improved catalytic stability and selectivity. The extent of modification effect varied with different alkali metals, with Rb having the highest promoting effect.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Physical
Sheng Fan, Han Wang, Shipei He, Kai Yuan, Pengfei Wang, Junfen Li, Sen Wang, Zhangfeng Qin, Mei Dong, Weibin Fan, Jianguo Wang
Summary: The finding of methylcyclohexene as a crucial reaction intermediate in the conversion of methanol to light olefins (MTO) plays a vital role in understanding the MTO reaction mechanism and further research.
Article
Engineering, Chemical
Shujia Guo, Han Wang, Zhangfeng Qin, Zhikai Li, Guofu Wang, Mei Dong, Weibin Fan, Jianguo Wang
Summary: The conversion of CO and CO2 into valuable liquid fuels and chemicals through hydrogenation has attracted significant interest. This study evaluates the feasibility, limit, and suitable conditions for these reactions through thermodynamic considerations. Results show that the hydrogenation of CO/CO2 to alcohols, light olefins, and aromatics is thermodynamically viable under appropriate conditions. Although current conversion processes may be restricted by kinetic factors, it is important to ensure that the reactions are conducted under thermodynamically feasible conditions. These results help determine the suitable operation region for CO/CO2 hydrogenation and provide directions for optimizing catalysts and processes.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Physical
Rui Geng, Yacong Liu, Yanxia Guo, Pengfei Wang, Mei Dong, Sen Wang, Jianguo Wang, Zhangfeng Qin, Weibin Fan
Summary: This study systematically investigated the structure evolution and regeneration behavior of Zn-modified ZSM-5 catalysts in ethylene aromatization. The results showed that the generated coke species on spent catalysts can cover acid sites and block pore channels, leading to the transformation of active ZnOH+ species into inactive ZnO. After regeneration, the catalysts were fully recovered and exhibited higher aromatic selectivity.
Article
Chemistry, Physical
Qiuming Zhou, Sen Wang, Zhiwei Wu, Zhangfeng Qin, Mei Dong, Jianguo Wang, Weibin Fan
Summary: The pore structure and acidic property of ZSM-5 zeolite were controlled using an NH4HF2 and K2CO3 post-treatment method to improve its catalytic activity and stability in alkane aromatization. The Pt/KZSM-5(deAl) catalyst exhibited high conversions and aromatic selectivities for n-heptane, n-octane, and n-nonane, and showed a long catalytic lifetime. The regulation of pore structure and acidity reduced cracking reactions and enhanced the interaction between Pt and ZSM-5 zeolite.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Sen Wang, Li Zhang, Pengfei Wang, Weiyong Jiao, Zhangfeng Qin, Mei Dong, Jianguo Wang, Unni Olsbye, Weibin Fan
Summary: This study developed a composite material capable of selectively hydrogenating CO2 to produce high-value hydrocarbons, with high product selectivity and stability. Incorporation of proper amounts of Ga into ZrO2 promoted methanol formation, avoiding the limitation of aromatics generation under high H-2 pressure.
Article
Chemistry, Physical
Tingyu Liang, Jialing Chen, Sen Wang, Pengfei Wang, Zhangfeng Qin, Fang Jin, Mei Dong, Jianguo Wang, Weibin Fan
Summary: This study investigates the effects of acid density on the methanol-to-hydrocarbon (MTH) performances and deactivation behaviors of H-MCM-22 zeolites. It is found that acid density has a significant impact on MTH performances, while acid distribution has a smaller effect. Increasing acid density promotes hydrogen transfer reactions and the formation of aromatics, ethene, and alkanes. Low acid density results in coke covering acid sites inside the micropores, while high acid density leads to massive coke deposition on the external surface. The deactivation behaviors of H-MCM-22 zeolites can be divided into three stages.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Rui Geng, Yacong Liu, Jie Gao, Yanxia Guo, Mei Dong, Sen Wang, Weibin Fan, Jianguo Wang, Zhangfeng Qin
Summary: In this study, the structure, composition, and evolution manner of Zn species in different reaction stages of ethylene aromatization over Zn-Modified ZSM-5 zeolites were investigated. The results show that the Zn species undergoes reciprocal transformation during the reaction, leading to changes in its composition and catalytic performance. This study provides important insights into the catalytic activity and deactivation mechanism of Zn/ZSM-5 catalysts.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hong Ma, Jian Liao, Zhihong Wei, Xinxin Tian, Junfen Li, Yan-Yan Chen, Sen Wang, Hao Wang, Mei Dong, Zhangfeng Qin, Jianguo Wang, Weibin Fan
Summary: A study of ethene methylation over H-ZSM-5 using a multiscale approach revealed the importance of methanol dehydration products as methyl donors, rapid formation of propene, and the essential role of a mobile methyl cation carrier in the process.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Wenyu Zhang, Sen Wang, Shujia Guo, Zhangfeng Qin, Mei Dong, Jianguo Wang, Weibin Fan
Summary: This study demonstrates that modifying zinc-zirconium oxides with lanthanum can effectively promote the formation of methanol intermediates, leading to improved catalytic performance in CO2 hydrogenation to light olefins. The addition of lanthanum induces the formation of more oxygen vacancies on the surface of the catalyst, facilitating the adsorption and activation of CO2 and the generation of methanol intermediates. Coupling with acidic zeolites allows for the rapid conversion of the methanol intermediates into light olefins. The composite catalysts exhibit high selectivity for C-2(=)-C-4(=) hydrocarbons.
CATALYSIS SCIENCE & TECHNOLOGY
(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)