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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received December 9, 2002
Accepted January 14, 2003

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Deactivation Control through Accelerated Precoking for the CoMo/γ-Al2O3 Catalysts in Thiophene Hydrodesulfurization

Seon-Ki Song Son-Ki Ihm^†

National Research Laboratory for Environmental Catalysis, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1 Gusung-dong, Yusung-gu, Daejeon 305-701, Korea

skihm@mail.kaist.ac.kr

Korean Journal of Chemical Engineering, March 2003, 20(2), 284-287(4), 10.1007/BF02697242

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Abstract

Information on the degree of deactivation is very important for predicting catalyst life, from which the catalyst design could be further improved. The CoMo/Al2O3 catalysts, used for the hydrodesulfurization of light oil, are known to have a commercial operation time of around two years. Our goal was to establish the accelerated precoking conditions for obtaining a desired degree of deactivation for CoMo/Al2O3 catalysts. The effect of coking temperature on the catalytic activity for thiophene hydrodesulfurization was investigated for three coke precursors. Precoking_x000D_ with heavier precursors resulted in higher coke content and higher aromaticity as expected, i.e., in order of anthracene>naphthalene>cyclohexene. It is suggested that the established conditions of precoking for the commercial catalysts could provide a quantitive reference for evaluating the lifetime of any commercial catalysts.

Keywords

Accelerated Deactivation Precoking Hydrodesulfurization Coke Deposit Aromaticity

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