Studies on the Acidity-Reducibility and Catalytic Properties of NiHY Zeolites

Abstract

Abstract: The structure, acidity, reducibility of Ni²⁺.and the reaction of toluene conversion of NiHY zeolite have been studied by using XRD, NH₃-TPD, Py-IR, TPR and toluene conversion reaction. It is found that both the number and the strength of acid sites on NiHY zeolite increase with increasing nickel content, and the number of Bronsted acid sites decrease,while the number of Lewis acid sites increase. Otherwise, there are two peaks of H₂consumption, in the range of 573-673-Kand 973-1073 K, respectively, which appear in TPR spectra of NiHY zeolite, and their area increases with the increase of nickel content. The results of the reaction of toluene conversion over NiHYzeolite indicate that the products of aromatic ring opening and dernethylation increase markedly, while the product of disproportionation decreases greatly with the increase of nickel content in NiHY. Associated with the data of acidity and reducibility of Ni²⁺, the change of the selectivity of toluene conversion over NiHY zeolite has been discussed.

Key words: NiHY zeolite, Acidity, Reducibility, Toluene conversion

TrendMD:

FU Jun, ZHU Chong-Ye, LI Quan-Zhi . Studies on the Acidity-Reducibility and Catalytic Properties of NiHY Zeolites[J]. Chem. J. Chinese Universities, 1995, 16(3): 461.

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Studies on the Acidity-Reducibility and Catalytic Properties of NiHY Zeolites

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