Effect of H{sub 2} and CO on the high temperature, gas-phase formation of NO, NO{sub 2}, and N{sub 2}O from NH{sub 3}
Journal Article
·
· International Chemical Engineering
OSTI ID:43108
- Nagoya Univ. (Japan)
Before elucidation can take place of NO{sub x} formation from volatile nitrogen in coal combustion, apart from the effects of thermal NO{sub x} and charring, the fundamentals of NH{sub 3} decomposition must be examined in the presence of other gases in a gas-phase reaction system. The gas-phase formation of NO, NO{sub 2}, and N{sub 2}O from NH{sub 3} in a high temperature reaction in the presence of H{sub 2} and CO was experimentally investigated in a tubular flow reactor at temperatures of 1,150-1,243 K, initial O{sub 2} concentrations of {<=} 3.0%, and using the four gas-reaction systems: NH{sub 3}-O{sub 2}-Ar, NH{sub 3}-H{sub 2}-O{sub 2}-Ar, NH{sub 3}-CO-O{sub 2}-Ar, and NH{sub 3}-H{sub 2}-CO-O{sub 2}-Ar Over these experimental ranges, the following was found: (1) the main product of the decomposition of NH{sub 3} was N{sub 2}, while NO, NO{sub 2}, and N{sub 2}O were formed; (2) H{sub 2} and CO accelerated the decomposition of NH{sub 3}, while H{sub 2} had a greater suppressive effect on the formation of NO and N{sub 2}O from NH{sub 3} than CO; (3) the concentrations of NO and N{sub 2}O were related to the ratios of the concentrations [H{sub 2} + CO]{sub 0}/[O{sub 2}]{sub 0} and [H{sub 2}]{sub 0}/[CO + O{sub 2}]{sub 0}, respectively; and (4) the NO{sub 2} concentration was very low for all four systems.
- OSTI ID:
- 43108
- Journal Information:
- International Chemical Engineering, Journal Name: International Chemical Engineering Journal Issue: 4 Vol. 34; ISSN INCEAX; ISSN 0020-6318
- Country of Publication:
- United States
- Language:
- English
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