In situ formation of the active sites in Pd–Au bimetallic nanocatalysts for CO oxidation: NAP (near ambient pressure) XPS and MS study,Faraday Discussions

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In situ formation of the active sites in Pd–Au bimetallic nanocatalysts for CO oxidation: NAP (near ambient pressure) XPS and MS study
Faraday Discussions ( IF 3.3 ) Pub Date : 2018-01-24 , DOI: 10.1039/c7fd00219j
A. V. Bukhtiyarov _{1,

2,

3,

4} , I. P. Prosvirin _{1,

2,

3,

4,

5} , A. A. Saraev _{1,

2,

3,

4,

5} , A. Yu. Klyushin _{6,

7,

8} , A. Knop-Gericke _{6,

7,

8} , V. I. Bukhtiyarov _{1,

2,

3,

4,

5}

Affiliation

Model bimetallic Pd–Au/HOPG catalysts have been investigated in the CO oxidation reaction using a combination of NAP XPS and MS techniques. The samples have shown catalytic activity at temperatures above 150 °C. The redistribution of Au and Pd on the surface depending on the reaction conditions has been demonstrated using NAP XPS. The Pd enrichment of the bimetallic particles’ surface under reaction gas mixture has been shown. Apparently, CO adsorption induces Pd segregation on the surface. Heating the sample under reaction conditions above 150 °C decomposes the Pd–CO state due to CO desorption and reaction and simultaneous Pd–Au alloy formation on the surface takes place. Cooling back down to RT results in reversible Pd segregation due to Pd–CO formation and the sample becomes inactive. It has been shown that in situ studies are necessary for investigation of the active sites in Pd–Au bimetallic systems.

中文翻译：

在Pd-Au双金属纳米催化剂中用于CO氧化的活性位的原位形成：NAP（接近环境压力）XPS和MS研究

结合NAP XPS和MS技术，已在CO氧化反应中研究了双金属Pd-Au / HOPG模型催化剂。样品在高于150°C的温度下显示出催化活性。使用NAP XPS证明了根据反应条件，Au和Pd在表面上的重新分布。已经显示了在反应气体混合物下双金属颗粒表面的Pd富集。显然，CO吸附会引起Pd在表面的偏析。在高于150°C的反应条件下加热样品会由于CO的脱附和反应而分解Pd-CO态，同时在表面上同时形成Pd-Au合金。冷却至室温会由于Pd–CO的形成而导致Pd偏析可逆，并且样品变得不活泼。已经表明，原位研究对于调查Pd-Au双金属系统中的活性位点是必要的。

更新日期：2018-09-03

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