Interparticulate coke formation during hydrocarbon cracking on zeolite catalysts

Abstract

A thermogravimetric study of coking of various C6–C7 hydrocarbons on HY and REY zeolites was performed using a Cahn microbalance modified to allow in‐situ measurements of catalyst weight changes during reaction under flow conditions. Mass transfer effects during the reaction were found to play an important role in the coking process of the static catalyst bed. The results indicate that catalytic coke can form in the void space between zeolite particles in such a way as to deter molecular diffusion through the catalyst bed.

Anisole production by alkylation of phenol over ZSM5

“…The existence of sites active in catalytic cracking on the surface of catalytic coke, possibly large carbonium ions, has already been postulated by Shiring et al (1983).…”

Effect of partial poisoning of acid sites on selectivity in the multiple reactions of mono‐substituted‐t‐Butylbenzenes

“…Nevertheless, certain generalizations may be made (Oudar and Wise, 1985). The acid sites on the catalyst surface adsorb significant amounts of hydrocarbons even at elevated temperatures (Shiring et al, 1983). Unsaturated hydrocarbons of high molecular weight are adsorbed preferentially.…”