NO<sub>2</sub>在Ag/Pt(110)双金属表面上的吸附和分解

引用本文: 李金兵, 姜志全, 黄伟新. NO₂在Ag/Pt(110)双金属表面上的吸附和分解[J]. 物理化学学报, doi: 10.3866/PKU.WHXB201301241 shu

Citation: LI Jin-Bing, JIANG Zhi-Quan, HUANG Wei-Xin. Adsorption and Decomposition of NO₂ on Ag/Pt(110) Bimetallic Surface[J]. Acta Physico-Chimica Sinica, doi: 10.3866/PKU.WHXB201301241 shu

NO₂在Ag/Pt(110)双金属表面上的吸附和分解

基金项目:
国家自然科学基金(11079033)资助项目 (11079033)

摘要:

利用俄歇电子能谱(AES)和程序升温脱附谱(TDS)研究了NO₂在Ag/Pt(110)双金属表面的吸附和分解.室温下NO₂ 在Ag/Pt(110)双金属表面发生解离吸附, 生成NO(ads)和O(ads)表面吸附物种. 在升温过程中NO(ads)物种发生脱附或者进一步分解. 500 K时NO₂在Ag/Pt(110)双金属表面发生解离吸附生成O(ads)表面吸附物种. Pt 向Ag传递电子, 从而削弱Pt－O键的强度, 降低O(ads)从Pt 表面的并合脱附温度. 发现能够形成具有稳定组成的Ag/Pt(110)合金结构, 其表现出与Pt(110)-(1×2)相似的解离吸附NO₂能力, 但与O(ads)的结合明显弱于Pt(110)-(1×2). 该AgPt(110)合金结构是可能的低温催化直接分解氮氧化物活性结构.

关键词:

English

Adsorption and Decomposition of NO₂ on Ag/Pt(110) Bimetallic Surface

1.
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
Received Date: 28 November 2012
Available Online: 25 March 2013
Fund Project:
国家自然科学基金(11079033)资助项目

Abstract:

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 under es dissociative chemisorption on Ag/Pt(110) bimetallic surfaces, forming chemisorbed NO(ads) and O(ads). Upon heating, NO(ads) under es 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 NO_x at relatively low temperatures.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

NO₂在Ag/Pt(110)双金属表面上的吸附和分解

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