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The dissociative adsorption of hydrogen sulfide over nanophase titanium dioxide

Published online by Cambridge University Press:  31 January 2011

Donald D. Beck  and
Richard W. Siegel
Donald D. Beck
Affiliation:
Physical Chemistry Department, General Motors Research Laboratories, Warren, Michigan 48090-9055
Richard W. Siegel
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439-4815
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Abstract

A variety of TiO2 materials, including a nanophase TiO2 powder, were evaluated for their ability to dissociatively adsorb H2S in a H2 environment. A temperature programmed desorption technique was used to determine the rate of sulfide accumulation on the surface of the samples as a measurement of initial activity. The initial activity for the gas condensation-produced nanophase TiO2 with its rutile structure was found to be greater than that for other samples of TiO2 tested. When normalized for surface area, the initial specific activities of the rutile samples studied for the dissociative adsorption of H2S were similar in magnitude, but significantly higher than those of the anatase TiO2 samples investigated. Thus, the improvement in the activity is attributed mainly to the ability of the nanophase synthesis method to produce high surface area rutile TiO2. When evaluated using x-ray photoelectron spectroscopy, the nanophase TiO2 was found to be significantly deficient in oxygen. Annealing this material in oxygen decreased the number of anion vacancies and lowered the activity. Thus, we conclude that oxygen vacancies also contribute to the H2S dissociative adsorption activity.

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Type
Articles
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Journal of Materials Research , Volume 7 , Issue 10 , October 1992 , pp. 2840 - 2845
Copyright
Copyright © Materials Research Society 1992

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