mc435_110.pdf 734 KB
Suganuma Satoshi Center for Research on Green Sustainable Chemistry, Graduate School of Engineering, Tottori University 研究者総覧 KAKEN
Nakamura Koshiro Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University
Okuda Akihito Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University
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 Brønsted and Lewis acid sites, ascribed to Si-OH-Al and Ni species, respectively, is suggested to give the high activity of desired reaction.
Copyright © 2017 Elsevier B.V. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
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: 10.1016/j.mcat.2017.03.029