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The role of CO2 dissociation in CO2 hydrogenation to ethanol on CoCu/silica catalysts

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Abstract

CoCu-based catalysts are widely used in COx hydrogenation reactions to produce higher alcohols due to the C-C coupling ability of Co and the ability of Cu to produce alcohols. This work describes the role of easily happened CO2 dissociation on the CoCu surface during the reaction, using different silica support to tune the metal—support interaction, and reaches different selectivity to ethanol. CoCu supported on mesoporous silica MCM-41 shows ethanol selectivity as high as 85.3%, and the ethanol space-time yield (STY) is 0.229 mmol/(gmetal·h), however, poor selectivity to ethanol as low as 28.8% is observed on CoCu supported on amorphous silica. The different selectivity is due to the different intensities of CO2 dissociation on the catalysts. The adsorbed O⋆ produced via CO2 dissociation can occupy the cobalt hollow sites on CoCu surfaces, which are also the adsorption sites of C1 intermediates for further C-C coupling.

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Acknowledgements

We acknowledge the National Key R&D Program of China (No. 2021YFA1500704), the National Natural Science Foundation of China (No. 22121004), the Haihe Laboratory of Sustainable Chemical Transformations (No. CYZC202107), the Program of Introducing Talents of Discipline to Universities (No. BP0618007), and the XPLORER PRIZE for financial support.

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Authors and Affiliations

  1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin, 300072, China

    Zhongyan Wang, Chengsheng Yang, Xianghong Li, Xiwen Song, Chunlei Pei, Zhi-Jian Zhao & Jinlong Gong

  2. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou, 350207, China

    Jinlong Gong

  3. Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192, China

    Jinlong Gong

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  1. Zhongyan Wang
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Correspondence to Zhi-Jian Zhao.

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Wang, Z., Yang, C., Li, X. et al. The role of CO2 dissociation in CO2 hydrogenation to ethanol on CoCu/silica catalysts. Nano Res. 16, 6128–6133 (2023). https://doi.org/10.1007/s12274-022-5092-x

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