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COS hydrolysis using zinc-promoted alumina catalysts

Huang, H., Young, N., Williams, B. P., Taylor, Stuart Hamilton and Hutchings, Graham John 2005. COS hydrolysis using zinc-promoted alumina catalysts. Catalysis Letters 104 (1-2) , pp. 17-21. 10.1007/s10562-005-7430-5

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Abstract

The effect of doping alumina catalysts with zinc oxide is investigated for the COS hydrolysis reaction (COS + H2O=CO2 + H 2S) at 150°C. The effect of the catalyst preparation method is described and discussed, and two methods are compared, namely: impregnation by incipient wetness of zinc nitrate followed by calcination to form the oxide and coprecipitation to form a hydroxide followed by calcination. The most effective zinc-promoted catalysts are prepared using the incipient wetness impregnation method. The promotional effect of zinc oxide on alumina is only observed on the basis of intrinsic activity and is not particularly significant at the initial time on stream, but becomes more marked with increased reaction time. The addition of the zinc oxide therefore decreases the deactivation and experiments using catalysts pretreated with H2S and H2O show that the alumina is deactivated by adsorption of these reactants. However, the effect is related to ZnO acting as a sulfur scavenger at 150 °C and we conclude that any promotional effect is likely to be relatively short lived. © 2005 Springer Science+Business Media, Inc.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Adsorption; Calcination; Catalysis; Hydrolysis; Sulfur; Zinc oxide, γ-alumina; Catalyst promotion; COS hydrolysis; Incipient wetness impregnation, Alumina
Additional Information: cited By (since 1996) 3
Publisher: Kluwer Academic Publishers
ISSN: 1011372X
Last Modified: 04 Jun 2017 02:10
URI: http://orca.cf.ac.uk/id/eprint/10276

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