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Acta Phys. Chim. Sin.
Adsorption and Decomposition of NO2 on Ag/Pt(110) Bimetallic Surface
LI Jin-Bing1, JIANG Zhi-Quan2, HUANG Wei-Xin2
1 Yanshan Branch of SINOPEC Beijing Research Institute of Chemical Industry, SINOPEC, Beijing 102500, China;
2 Hefei National Laboratory for Physical Sciences at the Microscale, Chinese Academy of Sciences, Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, Anhui, China
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The adsorption and decomposition of NO2 on Ag/Pt(110) bimetallic surfaces have been investigated by Auger electron spectroscopy (AES) and thermal desorption spectroscopy (TDS). At room temperature, NO2 undergoes dissociative chemisorption on Ag/Pt(110) bimetallic surfaces, forming chemisorbed NO(ads) and O(ads). Upon heating, NO(ads) undergoes both desorption from the surface and further decomposition. At 500 K, NO2 chemisorbs dissociatively on Ag/Pt(110) bimetallic surfaces, forming O(ads). Electron transfer occurs from Pt to Ag, therefore, the presence of Ag on Pt(110) surface weakens the binding energy of O(ads) with the surface and decreases the temperature required for the recombinative desorption of O(ads) from the surface. We observed the formation of a Ag/Pt(110) alloy structure that exhibits catalytic activity towards NO2 decomposition similar to that of Pt(110)-(1×2) but with a binding energy towards O(ads) much lower than that of Pt(110)-(1×2). Such a Ag/Pt(110) alloy structure may be active in catalyzing the direct decomposition of NOx at relatively low temperatures.

Key wordsAg/Pt(110) bimetallic surface      NO2      Chemisorption      Decomposition      Promotion effect     
Received: 28 November 2012      Published: 24 January 2013
MSC2000:  O643  

The project was supported by the National Natural Science Foundation of China (11079033).

Cite this article:

LI Jin-Bing, JIANG Zhi-Quan, HUANG Wei-Xin . Adsorption and Decomposition of NO2 on Ag/Pt(110) Bimetallic Surface. Acta Phys. Chim. Sin., 2013, 29(04): 837-842.

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