Chemisorption of nitric oxide at a Zn(0001) surface and the role of water vapour in its hydrogenation

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Abstract

The techniques of X-ray and u. v. -photoelectron spectroscopy have been used to investigate the chemisorption of the individual molecules nitric oxide, oxygen, and water, and also of coadsorbed nitric oxide and water, at Zn(0001) surfaces. The core and valence level spectra established that at 77 K, nitric oxide existed in both dissociative and molecular states, oxygen generated both surface O¯ (a) and subsurface O 2- (b) species, while water was only physically adsorbed. At 160 K and above, Zn(0001) surfaces were unreactive to water vapour, while at 295 K only the dissociative state of nitric oxide was present. The coadsorbed water-nitric oxide adlayer was reactive below 200 K. Surface hydroxyls were formed through the activation of molecularly adsorbed water by chemisorbed oxygen generated in the dissociative chemisorption of nitric oxide. These surface hydroxyls participated in a hydrogen transfer reaction leading to hydrogenation of the chemisorbed nitrogen at 273 K followed by desorption. In the absence of water, chemisorbed nitrogen adatoms are by comparison thermally stable. A detailed mechanism, with each surface species spectroscopically identified, is proposed for the hydrogenation of nitric oxide. Analysis of the X-ray induced core level spectra enabled the concentrations of the surface species to be calculated.

Publisher

The Royal Society

Subject

Pharmacology (medical)

Cited by 21 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Oxygen transient states in catalytic oxidation at metal surfaces;Catalysis Today;2011-07

2. Activation of oxygen at metal surfaces;Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences;2005-04-15

3. Theoretical and experimental study of the interaction of O2 and H2O with metallic zinc—discussion of the initial step of oxide formation;Journal of Colloid and Interface Science;2004-08

4. A METHANOL–WATER COMPLEX STABILIZED ON A Zn(0001) SURFACE;Surface Review and Letters;2003-02

5. The interaction of water with solid surfaces: fundamental aspects revisited;Surface Science Reports;2002-05

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