Enhancement of Catalytic Activity for Toluene Disproportionation by Loading Lewis Acidic Nickel Species on ZSM-5 Zeolite
| Autor: | Satoshi Suganuma, Koshiro Nakamura, Akihito Okuda, Naonobu Katada |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010405 organic chemistry
Chemistry Ni loading Process Chemistry and Technology Inorganic chemistry Xylene Disproportionation 010402 general chemistry 01 natural sciences Toluene Catalysis 0104 chemical sciences toluene disproportionation chemistry.chemical_compound synergy effect Lewis acids and bases ZSM-5 Physical and Theoretical Chemistry Zeolite Benzene acidic property |
| Zdroj: | This work was published by Elsevier: Suganuma, S., Nakamura, K., Okuda, A., Katada, N., Enhancement of Catalytic Activity for Toluene Disproportionation by Loading Lewis Acidic Nickel Species on ZSM-5 Zeolite, Molecular catalysis. 2017, 435, 110-117. doi |
| ISSN: | 2468-8231 |
| Popis: | Impregnation of various heteroelements on the ZSM-5 zeolite was applied to improvement of the catalytic activity in toluene disproportionation. Nickel loaded on ZSM-5 (Ni/ZSM-5) exhibited higher catalytic activity (toluene conversion) and lower benzene/xylene ratio (closer to the stoichiometry, meaning low rate of side reaction) than H-ZSM-5 zeolite. The Ni/ZSM-5 with Ni/Al = 0.6 showed the maximum in catalytic activity, and excess Ni loading caused decrease in the conversion and increase in the benzene/xylene ratio due to decrease of acid amount and acceleration of dealkylation, respectively. The detailed analysis of acidic property by means of ammonia IRMS-TPD method showed that the Ni loading generated Lewis acid sites on the zeolite. The synergy of Bronsted and Lewis acid sites, ascribed to Si-OH-Al and Ni species, respectively, is suggested to give the high activity of desired reaction. |
| Databáze: | OpenAIRE |
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