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A study of no conversion into No 2 and N 2 O over Co 3 O 4 catalyst
Author(s) -
Ayoub Muhammad,
Faisal Irfan Muhammad,
Zuhairi Abdullah Ahmad
Publication year - 2012
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.10577
Subject(s) - catalysis , calcination , hydrocarbon , sintering , activation energy , chemistry , atmospheric temperature range , materials science , inorganic chemistry , nuclear chemistry , organic chemistry , thermodynamics , physics
The catalytic activity of Co 3 O 4 catalyst was examined in a differential reactor for converting NO to NO 2 and N 2 O. It was observed that mostly NO was oxidized to NO 2 rather than N 2 O over the catalyst at temperatures above 250°C in the presence of 5% oxygen and 10% water. The maximum conversion was 71% at 300°C. However, the presence of H 2 O slightly suppressed NO 2 generation due to the occupation of active sites by H 2 O but no such effect was observed during N 2 O generation. At calcination temperature of 300°C, the maximum activity of the catalyst for NO conversion was observed due to the sintering of the catalyst at higher temperatures. In the presence of hydrocarbon, inhibition of NO conversion was also observed. This was due to the hydrocarbon competition with NO for the active sites of the catalyst. Moreover, on comparing with other workers, the activity of NO conversion over Co 3 O 4 catalyst was found to be more selective towards NO 2 generation at a wide range of temperatures resulting in less N 2 O generation. The activation energy ( E a ) and pre‐exponential factor ( A o ) values were found to be 37.7 kJ mol −1 and −7.26 ppm −2 s −1 . © 2011 American Institute of Chemical Engineers Environ Prog, 2011