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Topics in Catalysis
Published in: Topics in Catalysis 6-7/2017

13-09-2016 | Original Paper

SO2 Adsorption on CeO2(100) and CeO2(111)

Author: David R. Mullins

Published in: Topics in Catalysis | Issue 6-7/2017

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Abstract

The adsorption and reaction of sulfur dioxide, SO2, was studied on oxidized and reduced CeOX(100) and compared to previous results on CeOX(111). SO2 adsorbs on oxidized CeO2(100) as sulfite, SO3 2−, at 200 K and sulfite is the only adsorbate observed on the surface at any temperature. The sulfite desorbs monotonically from 200 to 700 K. The adsorption and desorption of SO2 does not result in any change in the Ce4+ oxidation state. SO2 also adsorbs as sulfite on reduced CeO1.7(100) at 200 K. There is also a small amount of elemental sulfur, S0, formed. As the sample is heated the sulfite decomposes into sulfide, S2−. Roughly 25 % of the adsorbed S either desorbs or diffuses into the bulk of the reduced ceria. The decomposition, and resulting formation of S2− and O2−, re-oxidize some of the Ce3+ to Ce4+. Unlike what has been observed following the adsorption and reaction of many other molecules, the adsorption and reaction of SO2 is virtually identical on CeOX(100) and CeOX(111).
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Metadata
Title
SO2 Adsorption on CeO2(100) and CeO2(111)
Author
David R. Mullins
Publication date
13-09-2016
Publisher
Springer US
Published in
Topics in Catalysis / Issue 6-7/2017
Print ISSN: 1022-5528
Electronic ISSN: 1572-9028
DOI
https://doi.org/10.1007/s11244-016-0710-z

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