Coke induced stabilization of catalytic activity of silylated ZSM-5 zeolite

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1995.1197· OSTI ID:111007

Bhat, Y S; Das, J; Halgeri, A B ^[1]

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1. Indian Petrochemicals Corp. Limited, Baroda (India)

One of the ways to synthesize dialkylbenzenes is to alkylate monoalkylbenzene with an alkylating agent such as alcohol or olefin over a Friedel-Crafts or zeolite catalyst. The latter is gaining importance as it is an environmentally friendly system. Dialkylbenzenes like paraxylene, para-ethyltoluene, and para-diethylbenzene are sources for various monomers. Several techniques have been reported in the literature to modify the zeolite characteristics in such a way that the dialkylbenzenes formed during monoalkylbenzene alkylation contain more para isomer. Among these techniques, the chemical vapor deposition of silica (CVD) is drawing the attention of researchers. The silylation results in fine control of pore opening size with the silica deposited on the external surface. The internal structure remains unaffected; only the pore entrance is narrowed. It was observed that the silylated zeolite used for synthesizing para-dialkylbenzene by monoalkylbenzene alkylation deactivates with increased time on stream. This paper deals with the coke-induced stabilization of catalytic activity of ZSM-5 zeolite during alkylation of ethylbenzene with ethanol.

• OSTI ID: 111007
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 155; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
40 CHEMISTRY
ALKYLATED AROMATICS
ALKYLATION
CATALYSTS
CATALYTIC EFFECTS
COKE
PORE STRUCTURE
ZEOLITES