Deactivation and regeneration of Rh/CeO2-ZrO2 catalyst for low-temperature steam reforming of ethanol

Hyun Seog Roh, Alex Platon, Yong Wang, David L. King

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ethanol steam reforming (ESR) deactivation experiments on Rh/CeO2-ZrO2 have been conducted in order to study the effect of the ceria-zirconia ratio, the cause of deactivation and the regeneration behavior for this catalyst. Tests performed at high space velocity and 450 °C on a series of catalysts with varying ceria-zirconia ratios have shown best hydrogen selectivity and performance stability for 2% Rh/Ce0.8Zr0.2O2. The cause of deactivation and regenerability was investigated in this catalyst by exposing the spent catalyst to low concentrations of oxygen. Evidence indicates that carbonaceous intermediates accumulate on the catalyst as it deactivates at 350 °C and high space velocity, reaching a maximum amount of about 0.9 mmol/g as the residual ESR conversion stabilizes at about 6%. About one third of the carbonaceous material is removed at room temperature in the presence of oxygen, while the remaining deposits could be oxidized at 200-210 °C with full recovery of catalyst activity.

Original languageEnglish
Title of host publicationAbstracts of Papers - 232nd American Chemical Society Meeting and Exposition
Publication statusPublished - 2006 Dec 1
Event232nd American Chemical Society Meeting and Exposition - San Francisco, CA, United States
Duration: 2006 Sep 102006 Sep 14

Publication series

NameACS National Meeting Book of Abstracts
Volume232
ISSN (Print)0065-7727

Other

Other232nd American Chemical Society Meeting and Exposition
CountryUnited States
CitySan Francisco, CA
Period06/9/1006/9/14

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Roh, H. S., Platon, A., Wang, Y., & King, D. L. (2006). Deactivation and regeneration of Rh/CeO2-ZrO2 catalyst for low-temperature steam reforming of ethanol. In Abstracts of Papers - 232nd American Chemical Society Meeting and Exposition (ACS National Meeting Book of Abstracts; Vol. 232).