NEXAFS fingerprinting of TiO2(110)-SO2

D. R. Warburton, D. Purdie, C. A. Muryn, K. Prabhakaran, P. L. Wincott, G. Thornton

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)305-309
Number of pages5
JournalSurface Science
Volume269-270
Issue numberC
DOIs
Publication statusPublished - 15 May 1992

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