Article
Chemistry, Physical
Pengyao Sun, Haiyong Wang, Jiaxin Huang, Wenmeng Ling, Yuhe Liao, Chenguang Wang
Summary: In the catalytic process of glucose from bulk methanol to Lewis acid centers via zeolite pores, competitive adsorption driven by hydrogen bonding is detected. The change from methanol-to glucose-silicon hydroxyl bonds slows down the rate of Lewis acid center carbonyl activation. The increased silicon hydroxyl binding to glucose results in lower acidity of metal centers, which almost eliminates the variations in reactivity caused by metal identity. On the other hand, the absence of hydroxyl at the solvent, substrate, or interface prevents competitive adsorption and brings out the acidity of different metal centers, with Sn > In > Hf > Ti > Zr being the order of binding ability to the carbonyl. This study contributes to the development of zeotype metal center local environments for substrate and solvent matching in various reaction networks.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Nanoscience & Nanotechnology
Kachaporn Saenluang, Wanmai Srisuwanno, Saros Salakhum, Chadatip Rodaum, Pannida Dugkhuntod, Chularat Wattanakit
Summary: Hierarchical Sn-substituted ZSM-48 nanostructures were successfully synthesized using amorphous Sn-Si nanobeads as starting materials. The presence of Sn-Si nanobeads improved the crystallization and dissolution rate of zeolites, resulting in a uniform spherical morphology and a high fraction of tetrahedral Sn in the framework. The catalytic performance of Sn-Si/ZSM-48 in glucose conversion to fructose was significantly enhanced, demonstrating the potential of hierarchical ZSM-48 for glucose upgrading applications.
ACS APPLIED NANO MATERIALS
(2021)
Article
Engineering, Chemical
Xiangcheng Li, Xiaohong Yuan, Guopeng Xia, Jun Liang, Chuang Liu, Yucai Qin, Zhendong Wang, Weimin Yang
Summary: By dealuminating SCM-1 and adding Sn species, a new MWW-type stannosilicate Sn-SCM-1 with a partially delaminated layered structure was successfully synthesized. The delaminated double-layered structure of Sn-SCM-1 offers numerous reactive sites for catalysis and facilitates the diffusion of biomass macromolecules, resulting in superior catalytic efficiency in converting glucose to methyl lactate and excellent recyclability in cycle tests.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Shen Hu, Junru Liu, Guanghua Ye, Xinggui Zhou, Marc-Olivier Coppens, Weikang Yuan
Summary: A generalizable strategy has been developed to quantify the effect of surface barriers on zeolite catalysis using isomerization of n-pentane as a model system. Surface modification by SiO2 deposition was found to reduce surface barriers, improve diffusion, and increase catalytic activity of Pt/Beta catalyst. These results demonstrate that reducing surface barriers can effectively enhance zeolite catalyst performance affected by transport limitations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Han Chen, Omar A. Abdelrahman
Summary: The kinetic investigation of the Hofmann elimination of tert-butylamine over H-ZSM-5 suggests a carbocation-mediated E1-like mechanism, where isobutene and ammonia are produced exclusively on Bronsted acid sites. Water is found to reversibly inhibit the reaction rate, independent of the Al content, due to one water molecule per Bronsted acid site. Despite the water-induced inhibition, the coverage of TBA adsorbed on H-ZSM-5 remains unchanged, potentially indicating cooperative adsorption between the tert-butylammonium surface reactant and water adsorbed on a neighboring framework oxygen.
Article
Chemistry, Applied
Caixia Miao, Meng Liu, Shengdong Tan, Guikai Zhang, Shengqi Chu, Shaojia Song, Qiyang Zhang, Jiaju Yu, Guiyuan Jiang, Weiyu Song, Qian He, Wenhao Luo, Zhijie Wu
Summary: Zeolite-tailored bimetallic Pt-Sn catalysts, Pt/Sn-Beta (DG) and Pt/Sn-Beta (DA), were prepared and compared. Pt/Sn-Beta (DG) showed superior performance in activity, selectivity, and stability due to the proper Pt-Sn nano-alloying, while Pt/Sn-Beta (DA) suffered from migration of excess extra-framework Sn species, resulting in less performance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Review
Chemistry, Physical
Ping Zhu, Hu Li, Anders Riisager
Summary: Sn-Beta zeolite, a tin-modified Beta zeolite, has been widely studied as a heterogeneous catalyst for sugar transformations. It has shown remarkable catalytic efficiency in converting glucose to fructose and lactic acid derivatives, sparking extensive interest in developing more efficient synthesis routes and applications for sugars. This review summarizes the progress made in synthesizing Sn-Beta and its applications in catalyzing sugar transformations, including isomerization, dehydration, and fragmentation processes.
Article
Engineering, Environmental
Guohao Zhang, Pei Xue, Jun Wei, Yuhao Zhang, Liang Zhao, Jinsen Gao, Chunming Xu
Summary: This study investigated the competitive adsorption mechanism of thiophene/diethyl sulfide on all-silicon Y zeolite using GCMC simulation. A two-stage loads dependence adsorption mechanism was discovered, and it was found that high temperature enhances the selectivity of thiophene adsorption while lower temperature can remove sulfides more completely.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Alexander P. Spanos, Aamena Parulkar, Nicholas A. Brunelli
Summary: Enhancement of catalytic performance of zeolites can be achieved by controlling catalytic sites and reaction environment. Experimental results show that a hydrophobic framework is beneficial for alcohol ring opening of epoxides, with hydrophobic materials demonstrating higher turnover frequencies than hydrophilic catalysts under certain reaction conditions.
JOURNAL OF CATALYSIS
(2021)
Editorial Material
Chemistry, Multidisciplinary
Pannida Dugkhuntod, Narasiri Maineawklang, Chadatip Rodaum, Peerapol Pornsetmetakul, Kachaporn Saenluang, Saros Salakhum, Chularat Wattanakit
Summary: Various metals have been incorporated into MFI nanosheets successfully, resulting in zeolites with high surface area and mesopore volume. The successful introduction of heteroatoms in the framework has been confirmed by UV-Vis absorbance spectra and XRD peaks shift.
Article
Chemistry, Multidisciplinary
Pannida Dugkhuntod, Narasiri Maineawklang, Chadatip Rodaum, Peerapol Pornsetmetakul, Kachaporn Saenluang, Saros Salakhum, Chularat Wattanakit
Summary: Various metals such as Sn, Ge, and Zr were successfully incorporated into MFI nanosheets, resulting in high external surface area and mesopore volume without large metal oxides aggregated on zeolite surfaces. The XRD peaks shifting indicated the successful introduction of heteroatoms in MFI nanosheets, while UV-Vis absorbance spectra showed the tetrahedral coordination of metal species in the zeolite framework. The SnMFI-NS samples demonstrated outstanding catalytic behavior in fructose selectivity (>85%) due to the high dispersion of metal isomorphous species.
Article
Environmental Sciences
Shuyi Yu, Xiaoyu Wang, Fang Liu, Kunkun Xiao, Chunli Kang
Summary: This study prepared hierarchical porous composites using natural diatomite and beta zeolite, and evaluated their adsorption capacity. The results demonstrated that the composite had superior adsorption capacities due to its suitable micropore size and chemical adsorption.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Manu Mohan, Vipin Kumar Singh, S. Reshmi, Mihir Ranjan Sahoo, Sudipta Roy Barman, Kuntala Bhattacharjee
Summary: We investigated the growth of Sn and the local electronic properties of Sn-grown WS2 surfaces using in-situ scanning tunneling microscopy (STM), scanning tunneling spectroscopy, and first principles density functional theory calculations. It was found that Sn substitutes S at the S sites and occupies a slightly elevated position on the WS2 surface. These findings are consistent with our observations of atomic Sn growth at room temperature, indicating commensurate or nearly commensurate adsorption with a buckling height of 40±10 pm. On pristine WS2 surfaces without S vacancies, a bandgap of 1.39 eV was observed, while the presence of S vacancies revealed ingap local density of states comprised of W d and S p orbitals. Upon adsorption of Sn atoms, hybridized ingap electronic states involving Sn p and W d orbitals with a spin orbit coupling interaction up to 38 meV were detected at the K point of the Brillouin zone. These results shed light on the future fabrication of Janus-like SnWS vertical heterojunctions with atomic level doping accuracy, which hold great potential for device applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Su-Un Lee, You-Jin Lee, Soo-Jin Kwon, Jeong-Rang Kim, Soon-Yong Jeong
Summary: This study investigates the catalytic properties of Pt-Sn catalysts supported on Beta zeolites for propane dehydrogenation (PDH) reactions. Compared to other supports, Beta zeolite-supported Pt-Sn catalysts show better propylene selectivity and achieve optimal performance after a proper reaction time. The differences in catalytic behavior are attributed to the physicochemical properties and reaction mechanism of Beta zeolite-supported Pt-Sn catalysts.
Article
Chemistry, Applied
Margarida M. Antunes, Diogo Falcao, Auguste Fernandes, Filipa Ribeiro, Martyn Pillinger, Joao Rocha, Anabela A. Valente
Summary: The study investigated the isomerization of D-glucose using various catalysts and energy supply methods, and found that a hierarchical potassium/magnesium-containing Beta catalyst combined with ultrasound waves at 75 degrees Celsius showed favorable results for the reaction.
