Get access
Advertisement

Mechanism of Coke Formation Caused by Catalytic Nanochromium Carbide Particles from Decomposition of CeCrO3

Authors

  • Hao Li,

    1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada
    Search for more papers by this author
  • Xinwei Cui,

    1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada
    Search for more papers by this author
  • Weixing Chen

    Corresponding author
    1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada
      †Author to whom correspondence should be addressed. e-mail: weixing.chen@ualberta.ca
    Search for more papers by this author

  • R. Koc—contributing editor

†Author to whom correspondence should be addressed. e-mail: weixing.chen@ualberta.ca

Abstract

Ce or CeO2 is often added to Fe–Cr–Ni base alloys to enhance protective Cr2O3 ceramic scale formation. In high-temperature carbonaceous reducing environments, however, it is still unsolved that Ce-containing alloys often exhibited increased carburization and coke formation. This research is aimed at understanding the mechanism of Ce-enhanced coke formation. It was found that CeO2 can cause catalytic activation of chromium carbide for carbon growth by first forming CeCrO3 and then decomposing CeCrO3 into CeO2 and active nanosize chromium carbide particles; the latter has proven to be conducive to coke formation. These findings can be helpful for the design of alloys with better ceramic coating resistant to carbonaceous degradation and for the growth of graphitic nanostructures using Cr-related catalysts.

Get access to the full text of this article

Ancillary