Correlation between the crystal zize and catalytic properties of ZSM-5 zeolites |
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| Affiliation: | 1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, China;2. Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong;1. J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, Prague 8 CZ-182 23, Czech Republic;2. Research Institute of Inorganic Chemistry, Unipetrol Group, Revoluční 1521, Ústí n/Labem CZ-400 01, Czech Republic;1. Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Institute of Coal Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;2. SINOPEC Research Institute of Petroleum Processing, State Key Laboratory of Catalytic Materials and Reaction Engineering for Petrochemical Industry, Beijing 100083, China;1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, 27 South Taoyuan Road, Taiyuan 030001, China;2. College of Chemistry and Environmental Engineering, Shanxi Datong University, Datong 037009, China;3. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China;4. Key Laboratory of Applied Surface and Colloid Chemistry, MOE, School of Chemistry & Materials Science, Shaanxi Normal University, Xi’an 710062, China |
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| Abstract: | ![]()
The effect of crystal size on the catalytic properties of H-ZSM-5 has been studied. Good correlation has been observed between crystal size and the catalytic properties of H-ZSM-5. In contrast to large crystallites, the aggregated H-ZSM-5 consisting of small crystallites showed long catalytic life and high selectivities for hydrocarbon, aromatics and aromatics (polymethyl aromatics) in the conversion reaction of methaol to hydrocarbons (MTG reaction). Compared with large crystallites, the aggregated H-ZSM-5 had higher adsorption ability of 2,2-dimethylbutane, largr intercrystalline void space ranging from 5 nm to 20 nm, larger pore volume, and more external surface acid sites. These results indicate that the crystal size of H-ZSM-5 significantly affects the catalytic activity in the MTG reaction and that the catalytic life could be somewhat predicted from these physicochemical properties. |
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