Reaction of NO with urea supported on activated carbons

N. Shirahama, I. Mochida, Y. Korai, K. H. Choi, T. Enjoji, T. Shimohara, A. Yasutake

Research output: Contribution to journalArticle

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Abstract

Reaction of NO in air with urea supported on activated carbons (AC) was examined in the range of 100-1000 ppm NO at room temperature to establish a basic scheme for its reduction in open atmosphere. NO in atmosphere containing O2 was found to be selectively reduced with urea supported on AC at the W/F of 2.5×10-3 to 1.5×10-3 ACF g min/ml and its reduction continued until the complete consumption of urea. The reduction of NO with urea supported on AC appears to proceed through the following steps. NO+12O2→NO2NO 2+NO+(NH2)2CO→2N2+CO 2+H2O Combining (1) and (2) steps results in the followed reaction equation. 2NO+(NH2)2CO+12O2→ 2N2+CO2+2H2O Since (1) is rate determining, high NO oxidation activity is essential for AC to be active for the reaction. At the same time, activation of urea by AC is also necessary to reduce NO 2. The present scheme for NO reduction with urea on the AC is very effective to remove NOx in the open atmosphere under ambient conditions.

Original languageEnglish
Pages (from-to)237-245
Number of pages9
JournalApplied Catalysis B: Environmental
Volume57
Issue number4
DOIs
Publication statusPublished - May 26 2005

Fingerprint

Urea
Activated carbon
urea
activated carbon
atmosphere
Carbon Monoxide
Chemical activation
oxidation
Oxidation
air
Air
temperature
Temperature

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Cite this

Shirahama, N., Mochida, I., Korai, Y., Choi, K. H., Enjoji, T., Shimohara, T., & Yasutake, A. (2005). Reaction of NO with urea supported on activated carbons. Applied Catalysis B: Environmental, 57(4), 237-245. https://doi.org/10.1016/j.apcatb.2004.04.004

Reaction of NO with urea supported on activated carbons. / Shirahama, N.; Mochida, I.; Korai, Y.; Choi, K. H.; Enjoji, T.; Shimohara, T.; Yasutake, A.

In: Applied Catalysis B: Environmental, Vol. 57, No. 4, 26.05.2005, p. 237-245.

Research output: Contribution to journalArticle

Shirahama, N, Mochida, I, Korai, Y, Choi, KH, Enjoji, T, Shimohara, T & Yasutake, A 2005, 'Reaction of NO with urea supported on activated carbons', Applied Catalysis B: Environmental, vol. 57, no. 4, pp. 237-245. https://doi.org/10.1016/j.apcatb.2004.04.004
Shirahama N, Mochida I, Korai Y, Choi KH, Enjoji T, Shimohara T et al. Reaction of NO with urea supported on activated carbons. Applied Catalysis B: Environmental. 2005 May 26;57(4):237-245. https://doi.org/10.1016/j.apcatb.2004.04.004
Shirahama, N. ; Mochida, I. ; Korai, Y. ; Choi, K. H. ; Enjoji, T. ; Shimohara, T. ; Yasutake, A. / Reaction of NO with urea supported on activated carbons. In: Applied Catalysis B: Environmental. 2005 ; Vol. 57, No. 4. pp. 237-245.
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