Molecular catalysis for the steam reforming of ethanol

Jianyi Lin*, Luwei Chen, Catherine Kai Shin Choong, Ziyi Zhong, Lin Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

In this paper, the application of molecular catalysis for steam reforming of ethanol (SRE) is reviewed. Eight metals (Ni, Co, Cu, Pt, Rh, Pd, Ir and Ru) have shown high catalytic activity for SRE. Among them Ni and Rh are very promising because of high d character in the metal bond and low metal-oxygen bonding (vs. metal-carbon). They can effectively promote C-C bond cleavage in the rate-determining process during SRE. However, Rh is weak in water-gas-shift so that CH4 and CO become the main by-products at low reaction temperatures, while Ni catalysts suffer from rapid deactivation due to coking and sintering. Two low-temperature CO-free catalysts have been developed in our lab, namely Rh-Fe/Ca-Al2O3 and carbonyl-derived Rh-Co/CeO2, in which the presence of iron oxide or Co can promote water-gas-shift reaction and significantly improve the SRE performance. On the other hand, adding 3 wt% CaO to Ni/Al2O3 can greatly improve the catalyst stability because the Ca modification not only increases Ni concentration on the Ni/Ca-Al2O3 surface and 3d valence electron density, but also facilitates the water adsorption and coke gasification via water-gas-shift. The availability of abundant surface OH groups helps the formation and conversion of adsorbed formate intermediate. Hence, ethanol reaction on Ca-Al2O3-supported Ni, Pt, Pd and Rh catalysts are found to follow the formate-intermediated pathway, a new reaction pathway alternative to the traditional acetate-intermediated pathway.

Original languageEnglish
Pages (from-to)60-78
Number of pages19
JournalScience China Chemistry
Volume58
Issue number1
DOIs
StatePublished - Jan 2015
Externally publishedYes

Keywords

  • Ca-AlO support
  • formate-intermediated pathway
  • hydrogen production
  • molecular catalysis
  • Ni catalysts
  • Rh catalysts
  • steam reforming of ethanol
  • support effects

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