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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2003, Volume 54, Issue 8,





Deactivation of Zeolite Catalysts by Coke Deposition
Paul Rosca, Raluca Dragomir, Constantin Ionescu

Abstract:

The catalysts used in fluid catalytic cracking process are reversibly deactivated by coke deposition. The coke deposition and its effect on catalyst activity have been studied using the microactivity test laboratory -scale reactor (MAT). The description of coking and deactivation will be based on the results obtained during n-hexadecane, isopropylbenzene and vacuum distillate cracking over an industrial equilibrium catalyst in MAT laboratory unit. The amount of coke and carbon to hydrogen ratio of coke on zeolite catalyst sample was determined by micro-elemental analysis. The coke was separated in two parts by extraction with organic solvent (CCl4): one soluble and other insoluble. The H/C ratio and yields of solubilization of coke component in CCl 4 decreased when the coke content and the aromaticity of feed increased . The decay of catalyst activity is strongly influenced by the amount of insoluble coke due to the large size of coke polyaromatic components which blocked the intersections of zeolite channels. A model of coke formation and the mechanism of deactivation were proposed. Keywords: catalysts, fluid catalytic cracking process, coke deposition, deactivation


Issue: 2003, Volume 54, Issue 8
Pages:
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