Highly Selective, Facile NO2 Reduction to NO at Cryogenic Temperatures on Hydrogen Precovered Gold

Title
Highly Selective, Facile NO2 Reduction to NO at Cryogenic Temperatures on Hydrogen Precovered Gold
Authors
Ming Pan함형철Wen-Yueh YuGyeong S. HwangC. Buddie Mullins
Keywords
NO2; NO; Reduction; Au
Issue Date
2013-01
Publisher
Journal of the American Chemical Society
Citation
VOL 135, NO 1, 436-442
Abstract
We have discovered that NO2 is reduced to NO at 77 K by hydrogen precovered gold in vacuum. Here, we investigate the partial reduction of NO2 to NO on an atomic-hydrogen populated model gold catalyst for a more fundamental understanding of the surface chemistry of hydrogenation. Goldbased catalysts have been found to be active for many hydrogenation reactions, but few related fundamental studies have been conducted. Our experimental results reveal a high catalytic activity for gold: indeed, NO2 is reduced to NO with 100% conversion and 100% selectivity at temperatures lower than 120 K. Density functional theory calculations and reflection−absorption infrared spectroscopy measurements indicate that HNO2 and N2O3 are intermediates which are highly dependent on surface hydrogen concentrations; subsequent hydrogenation of HNO2 and dissociation of N2O3 upon annealing induces the production of NO and H2O.
URI
http://pubs.kist.re.kr/handle/201004/44452
ISSN
00027863
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KIST Publication > Article
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