Reaction of NO with urea supported on activated carbons

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

doi:10.1016/j.apcatb.2004.04.004

Reaction of NO with urea supported on activated carbons

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

Department of Advanced Device Materials

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

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 NO_x in the open atmosphere under ambient conditions.

Original language	English
Pages (from-to)	237-245
Number of pages	9
Journal	Applied Catalysis B: Environmental
Volume	57
Issue number	4
DOIs	https://doi.org/10.1016/j.apcatb.2004.04.004
Publication status	Published - May 26 2005

All Science Journal Classification (ASJC) codes

Catalysis
Environmental Science(all)
Process Chemistry and Technology

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10.1016/j.apcatb.2004.04.004

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title = "Reaction of NO with urea supported on activated carbons",

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.",

author = "N. Shirahama and I. Mochida and Y. Korai and Choi, {K. H.} and T. Enjoji and T. Shimohara and A. Yasutake",

year = "2005",

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doi = "10.1016/j.apcatb.2004.04.004",

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T1 - Reaction of NO with urea supported on activated carbons

AU - Shirahama, N.

AU - Mochida, I.

AU - Korai, Y.

AU - Choi, K. H.

AU - Enjoji, T.

AU - Shimohara, T.

AU - Yasutake, A.

PY - 2005/5/26

Y1 - 2005/5/26

N2 - 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.

AB - 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.

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Reaction of NO with urea supported on activated carbons

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