Selective conversion of CO2 to isobutane-enriched C4 alkanes over InZrOx-Beta composite catalyst

Han Wang, Sheng Fan, Shujia Guo, Sen Wang (), Zhangfeng Qin (), Mei Dong, Huaqing Zhu, Weibin Fan and Jianguo Wang ()
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Han Wang: Institute of Coal Chemistry, Chinese Academy of Sciences
Sheng Fan: Institute of Coal Chemistry, Chinese Academy of Sciences
Shujia Guo: Institute of Coal Chemistry, Chinese Academy of Sciences
Sen Wang: Institute of Coal Chemistry, Chinese Academy of Sciences
Zhangfeng Qin: Institute of Coal Chemistry, Chinese Academy of Sciences
Mei Dong: Institute of Coal Chemistry, Chinese Academy of Sciences
Huaqing Zhu: Institute of Coal Chemistry, Chinese Academy of Sciences
Weibin Fan: Institute of Coal Chemistry, Chinese Academy of Sciences
Jianguo Wang: Institute of Coal Chemistry, Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-14

Abstract: Abstract Direct conversion of CO2 to a single specific hydrocarbon with high selectivity is extremely attractive but very challenging. Herein, by employing an InZrOx-Beta composite catalyst in the CO2 hydrogenation, a high selectivity of 53.4% to butane is achieved in hydrocarbons (CO free) under 315 °C and 3.0 MPa, at a CO2 conversion of 20.4%. Various characterizations and DFT calculation reveal that the generation of methanol-related intermediates by CO2 hydrogenation is closely related to the surface oxygen vacancies of InZrOx, which can be tuned through modulating the preparation methods. In contrast, the three-dimensional 12-ring channels of H-Beta conduces to forming higher methylbenzenes and methylnaphthalenes containing isopropyl side-chain, which favors the transformation of methanol-related intermediates to butane through alkyl side-chain elimination and subsequent methylation and hydrogenation. Moreover, the catalytic stability of InZrOx-Beta in the CO2 hydrogenation is considerably improved by a surface silica protection strategy which can effectively inhibit the indium migration.

Date: 2023
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DOI: 10.1038/s41467-023-38336-5

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