Spillover of labile OH, H, and O species in the H2 production by steam reforming of phenol over supported-Rh catalysts

K. Polychronopoulou, A. M. Efstathiou

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

The aim of this work was to probe the back-spillover of labile O, OH and H species during steam reforming of phenol towards H2 production in the 773-1028 K range over Rh supported on MgO and Mg-Ce-Zr-O mixed-metal oxides. This was made possible through steady state isotopic transient kinetic analysis (SSITKA) and other transient isotopic experiments (use of D2O and 18O2) combined with temperature-programmed desorption ones. The size of the active pool of H-containing intermediate species (H and/or OH) present in the H-path of reaction as a function of reaction T was measured over the 0.1 wt% Rh/50Mg-25Ce-25Zr-O catalyst by SSITKA experiments. It was found that the size of this pool decreases by 18% in the 773-928 K range (θ = 68.9-56.3), whereas a significant decrease (by a factor of 10) was observed between 928 and 1028 K. These results demonstrate that most of the active H and OH species reside on the support and metal-support interface. Two kinds of H-containing intermediate species are likely to participate in the H-path of reaction. An inverse D kinetic isotopic effect was measured for the H2 formation in the phenol steam reforming reaction in the 773-1028 K range.

Original languageBritish English
Pages (from-to)341-347
Number of pages7
JournalCatalysis Today
Volume116
Issue number3
DOIs
StatePublished - 15 Aug 2006

Keywords

  • Hydrogen production
  • Kinetic isotope effect
  • OH spillover
  • Oxygen spillover
  • Phenol steam reforming
  • SSITKA

Fingerprint

Dive into the research topics of 'Spillover of labile OH, H, and O species in the H2 production by steam reforming of phenol over supported-Rh catalysts'. Together they form a unique fingerprint.

Cite this