Direct oxidation of methane to oxygenates on supported single Cu atom catalyst
Direct oxidation of methane to oxygenates on supported single Cu atom catalyst
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负载型单 Cu 原子催化剂上甲烷直接氧化为含氧化合物
DOI:
10.1016/j.apcatb.2020.119827
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发表时间:
2021-05
期刊:
影响因子:
--
通讯作者:
Yun Guo
中科院分区:
文献类型:
--
作者:
Xuan Tang;Li Wang;Bing Yang;Chen Fei;Tingyi Yao;Wei Liu;Yang Lou;Qiguang Dai;Yafeng Cai;Xiao-Ming Cao;Wangcheng Zhan;Yanglong Guo;Xue-Qing Gong;Yun Guo
Catalytically converting CH4to chemicals and fuels is of paramount importance but remains a major challenge to simultaneously obtain high activity and selectivity. Here, we report Cu1/ZSM-5 single atom catalyst is highly active (C1 oxygenates productivity of 4800 μmol⋅gcat−1at 50 °C and 12,000 μmol⋅gcat-1at 70 °C within 30 min) and selective (C1 oxygenates selectivity of 99 % at 50 °C) for direct CH4oxidation, comparable to most of those state-of-the-art noble metal catalysts. The combined DFT calculation, electronic microscope, X-ray absorption and electron paramagnetic resonance results confirm that each isolated Cu atom stabilized by four O moieties on the ZSM-5 support possesses uniform Cu1-O4entity as active site and preferentially activates CH4instead of CH3OH that is advantageous for highly selective C1 oxygenates production, especially for methanol. Our molecular-level finding on the atomic structure of Cu active site paves the way to design better catalysts for methane conversion.
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