Effects of H2O on the thermal and photocatalytic reactions of ethane on supported Au

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Abstract

The effect of illumination on the H2O + C2H6 reaction was investigated on Au deposited on TiO2, ZnO and CeO2 samples. Whereas the photocatalytic decomposition of ethane is very limited even on the most active pure TiO2: the conversion was only ∼4% at 300 K in 210 min, the deposition of Au metal onto TiO2 markedly enhanced the rate of photo-induced decomposition of C2H6. Addition of H2O to ethane further enhanced the conversion and led to the production of H2. The highest conversion of ethane, 23.5% was measured for Au/TiO2. Ethylene was not detected even in traces, indicating the complete degradation of C2H6 to H2 and carbon containing deposit. Temperature programmed reaction (TPR) measurements revealed that the carbonaceous deposit on the catalysts is very stable. On Au/TiO2 it reacted with H2 to give CH4 at Tp = 453 and 604 K and C2H6 and C3H8 with Tp = 602 K. The promoting effect of metals was explained by a better separation of charge carriers induced by illumination and by the enhanced electronic interaction between metals and TiO2.

Original languageEnglish
Pages (from-to)19-24
Number of pages6
JournalMolecular Catalysis
Volume440
DOIs
Publication statusPublished - Jan 1 2017

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Keywords

  • Effects of HO
  • Photo-induced decomposition of ethane
  • Production of H and CH
  • TiO-supported Pt metals

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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