Deactivation of zeolite catalysis caused by coke deposition

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:215020

Hashimoto, K; Masuda, T ^[1]

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1. Kyoto Univ. (Japan)

Zeolite catalysts are widely used in conversion processes of hydrocarbons, because of their high activity and shape selectivity. The conversion rates and the shape selectivity are closely related to intracrystalline diffusion rate and acidic properties of the zeolite catalyst. Carbonaceous materials called coke deposit on the catalyst during reactions, leading to changes in catalytic properties (diffusivity and acidic properties) as well as the reaction performance. This presentation reviews the mechanisms of the deactivation of zeolite catalysts caused by coke deposition from the following points of view. (1) Characterization of coke. Examination of the location of coke formation. (2) Relationship between the changes in acidic properties, and the acid strength and the acid amount. Prediction of the reduction of diffusion rate taking account of pore structure and molecular size. (3) Development of models for predicting the changes in the activity and the shape selectivity.

• OSTI ID: 215020
• Report Number(s): CONF-950801--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
CATALYSTS
CATALYTIC EFFECTS
COKE
DEACTIVATION
HYDROCARBONS
PORE STRUCTURE
ZEOLITES