Infrared evidence of a formate-intermediate mechanism over Ca-modified supports in low-temperature ethanol steam reforming

Catherine Choong, Ziyi Zhong, Lin Huang, Armando Borgna, Liang Hong*, Luwei Chen, Jianyi Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

An in situ DRIFTS study of ethanol adsorption and desorption was performed on Pt (Rh, Pd) supported on Al2O3 and Ca-Al 2O3. Different from the well-known acetate-intermediate reaction mechanism observed on Al2O3-supported metal catalysts, formate species are exclusively observed on Pt (Rh, Pd) supported on Ca-Al2O3, offering a new mechanism denoted as the formate-intermediate mechanism. The key factor in determining the change in mechanism is the reduced availability of surface oxygen and the enhanced C-C breaking ability of the metal catalyst upon Ca modification. The formate-intermediate mechanism is favored in the presence of noble metals in the following order: Pt > Rh > Pd.

Original languageEnglish
Pages (from-to)2359-2363
Number of pages5
JournalACS Catalysis
Volume4
Issue number7
DOIs
StatePublished - 3 Jul 2014
Externally publishedYes

Keywords

  • acetate
  • Ca
  • ethanol steam reforming
  • formate
  • Pd
  • Pt
  • reaction pathway
  • Rh

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