Journal
MOLECULAR CATALYSIS
Volume 435, Issue -, Pages 110-117Publisher
ELSEVIER
DOI: 10.1016/j.mcat.2017.03.029
Keywords
ZSM-5; Ni loading; Toluene disproportionation; Acidic property; Synergy effect
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Funding
- Grants-in-Aid for Scientific Research [26241030, 16K18291] Funding Source: KAKEN
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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 NilZSM-5 with Ni/AI = 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. (C) 2017 Elsevier B.V. All rights reserved.
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