Cu-Zn Alloy Formation as Unfavored State for Efficient Methanol Catalysts
Cu-Zn Alloy Formation as Unfavored State for Efficient Methanol Catalysts
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DOI：
10.1002/cctc.202000777
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发表时间：
2020-06-18
期刊：
影响因子：
4.5
通讯作者：
Schloegl, Robert
中科院分区：
文献类型：
--
作者：
Frei, Elias;Gaur, Abhijeet;Schloegl, Robert
工业上应用于CO（2）或富CO2合成气加氢的Cu/ZnO基催化剂的活性中心仍然是当前争论的主题。一般来说，讨论集中在Cu和ZnO之间的界面接触的性质，特别是它是氧化（Cu-ZnO）或合金（Cu-Zn）字符。本文报道了在不同温度下活化的Cu/ZnO：Al高性能催化剂的动力学研究。还原条件下逐渐增加的温度也导致增加CuZn合金的形成，通过原位X射线衍射，原位X射线吸收光谱和高分辨率透射电子显微镜分析。的催化数据和互补的表征技术的组合提供了宝贵的见解的CH 3OH形成的相关反应位点。我们的研究结果突出了界面接触的复杂性与证据的Cu-ZnO反应位点和澄清的负面影响的CuZn合金的形成上的性质的活性位点。
The active sites of Cu/ZnO-based catalysts, commercially applied for the hydrogenation of CO(2)or CO2-rich synthesis gas, are still subject of current debates. Generally, the discussion is focused on the nature of the interfacial contact between Cu and ZnO, particularly whether it is rather of oxidic (Cu-ZnO) or alloying (Cu-Zn) character. We report on kinetic investigations on a Cu/ZnO : Al high performance catalyst activated at different temperatures. Incrementally increasing temperature under reductive conditions leads also to increased CuZn-alloy formation, analyzed byin-situX-ray diffraction,in-situX-ray absorption spectroscopy and high resolution transmission electron microscopy. The combination of the catalytic data and the complementary characterization techniques provide valuable insights on the relevant reaction sites for CH3OH formation. Our results highlight the complexity of the interfacial contact with evidence for Cu-ZnO reaction sites and clarify the negative impact of CuZn alloy formation on the nature of the active site.