NEXAFS fingerprinting of TiO2(110)-SO2

Polarisation-dependent S K-edge NEXAFS has been used to monitor the progression of the thermally-activated reaction between TiO2(110) and SO2.SO2 chemisorbs at 105 K, reacting to form a surface sulphate-like species as the substrate is heated to ⩾ 135 K. This is the final reaction product, having a...

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Published inSurface science Vol. 269-270; pp. 305 - 309
Main Authors Warburton, D.R., Purdie, D., Muryn, C.A., Prabhakaran, K., Wincott, P.L., Thornton, G.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.05.1992
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Summary:Polarisation-dependent S K-edge NEXAFS has been used to monitor the progression of the thermally-activated reaction between TiO2(110) and SO2.SO2 chemisorbs at 105 K, reacting to form a surface sulphate-like species as the substrate is heated to ⩾ 135 K. This is the final reaction product, having a coverage of 0.1 ML up to at least 450 K. A sulphite-like species is identified as an intermediate in this reaction, having a maximum concentration of ∼ 0.2 ML at 155 K. Structural models are suggested in which SO2 initially bonds to Ti sites, subsequently forming complex anion-like species by incorporation into the raised row of bridging O atoms.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(92)91265-D