Highly Selective, Facile NO2 Reduction to NO at Cryogenic Temperatures on Hydrogen Precovered Gold
- Highly Selective, Facile NO2 Reduction to NO at Cryogenic Temperatures on Hydrogen Precovered Gold
- Ming Pan; 함형철; Wen-Yueh Yu; Gyeong S. Hwang; C. Buddie Mullins
- NO2; NO; Reduction; Au
- Issue Date
- Journal of the American Chemical Society
- VOL 135, NO 1, 436-442
- 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.
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