Selectivity switch in transformation of CO2 from ethanol to methanol on Cu embedded in the defect carbon
Selectivity switch in transformation of CO2 from ethanol to methanol on Cu embedded in the defect carbon
复制标题
嵌入缺陷碳的 Cu 上 CO2 从乙醇转化为甲醇的选择性转换
DOI:
10.1007/s11426-019-9730-5
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发表时间:
2020-04
影响因子:
9.6
通讯作者:
Yan Zhu
中科院分区:
文献类型:
--
作者:
Shuohao Li;Govindarajan Saranya;Mingyang Chen;Yan Zhu
The copper-based catalysts have been generally regarded as high-performance catalysts for CO2 hydrogenation toward methanol, while the production of ethanol via C-C coupling on the copper-based catalysts is still challenging. Herein, we report a new catalyst where Cu nanoparticles are embedded in the carbon support with abundant defect sites, achieving a high selectivity for ethanol in the CO2 hydrogenation. The experiments coupled with the theoretical studies show a clear map where carbon defects serve as anchor sites that can stabilize interfacial copper species, and interfacial Cu sites with low coordination numbers can adsorb two C1 species and later convert them to a C2 species via a hydrogenation-induced coupling reaction. Further adjacent Cu atoms of interfacial Cu sites can facilitate OH reduction reactions via the Cu-Cu bridge adsorption to assist the formation of ethanol. Especially, those specific active sites easily disappear in the reducing conditions and during the reaction, the major product can transform from ethanol to methanol.
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