Intrinsic properties of active sites for hydrogen production from alcohols without coke formation

Zhong He, Xianqin Wang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The detailed reaction pathway and coke formation mechanism over Pt/metal oxide nanoparticles during the steam reforming of ethanol (SRE) at 300 °C were studied. The catalysts were prepared by incipient wetness impregnation method and were characterized with CO pulse chemisorption, BET surface measurement, oxygen adsorption, ethanol-TPD, NH3-TPD, and TPO. The SRE activity of the catalysts with steam/ethanol molar ratio of 3/1 was tested using a continuous fixed-bed reactor. Strong interaction between Pt and supports causes lower H2 production temperatures and no C2H 4 formation, while weak interaction leads to C2H 4 formation and strong bonded CO on Pt particles during ethanol- TPD. H2 production over Pt-based catalysts is mainly resulted from the decomposition and dehydrogenation of ethanol, and decarbonylation of acetaldehyde. Meanwhile, coke can be formed from acetaldehyde, acetone, C 2H4 and CO. However, when the interaction between Pt and supports is weak, more coke is formed especially from acetone, C 2H4 and CO. When the interaction is strong, no coke formation is observed due to high oxygen storage capacity of the catalyst.

Original languageEnglish (US)
Pages (from-to)436-445
Number of pages10
JournalJournal of Energy Chemistry
Volume22
Issue number3
DOIs
StatePublished - Jan 1 2013

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Electrochemistry

Keywords

  • Active sites
  • Alcohols
  • Coke formation
  • Hydrogen
  • Interaction
  • Pt

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