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Mechanism of Coke Formation Caused by Catalytic Nanochromium Carbide Particles from Decomposition of CeCrO 3
Author(s) -
Li Hao,
Cui Xinwei,
Chen Weixing
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04449.x
Subject(s) - coke , carbide , materials science , decomposition , chemical engineering , catalysis , ceramic , metallurgy , chromium carbide , chromium , carbon fibers , coating , nanotechnology , chemistry , composite material , composite number , organic chemistry , engineering
Ce or CeO 2 is often added to Fe–Cr–Ni base alloys to enhance protective Cr 2 O 3 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 CeO 2 can cause catalytic activation of chromium carbide for carbon growth by first forming CeCrO 3 and then decomposing CeCrO 3 into CeO 2 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.