ZnO-CeO2制备及催化性能研究

doi:10.19964/j.issn.1006-4990.2023-0251

Abstract

Abstract:

The catalytic conversion of CO₂ to methanol using green hydrogen generated from renewable energy sources is a promising path toward carbon neutrality.The catalyst employed in the CO₂ hydrogenation to methanol technology is a ZnO-CeO₂ bimetallic oxide.Various preparation methods such as impregnation，co-precipitation，precipitation coating，and physical mixing were investigated.Characterization techniques including X-ray diffraction（XRD），N₂ adsorption-desorption，carbon dioxide temperature-programmed desorption（CO₂-TPD），hydrogen temperature-programmed desorption（H₂-TPD），scanning electron microscopy（SEM），and X-ray photoelectron spectroscopy（XPS） were utilized to analyze the physicochemical properties of the ZnO-CeO₂ bimetallic oxide catalyst and its impact on the catalytic performance in CO₂ hydrogenation to methanol.The results indicated that the preparation method significantly influenced the physicochemical properties and catalytic performance of the catalyst.The ZnO-CeO₂ catalyst prepared by co-precipitation exhibited excellent catalytic performance.Under reaction conditions of temperature of 300 ℃，pressure of 4 MPa，and weight hourly space velocity of 19 600 mL/（g·h），the CO₂ conversion rate reached 4.61%，methanol selectivity achieved 80.64%，and the methanol space-time yield reached 244.96 mg/（h·g）.It was observed that high concentration of oxygen vacancies，strong H₂ activation capability，large specific surface area，and pore volume were crucial for enhancing the catalytic performance of this catalyst.

Key words: CO₂ hydrogenation, methanol, bimetallic oxide, fixed bed, oxygen vacancy

CLC Number:

TQ132.41

ZHAN Sijin, LIU Shike, LIU Fei, YAO Mengqin, CAO Jianxin. Study on preparation and catalytic performance of ZnO-CeO₂[J]. Inorganic Chemicals Industry, 2024, 56(3): 137-143.

Figures/Tables 8

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催化剂	比表面积/（m²·g^-1）			孔容/（cm³·g^-1）
催化剂	S_BET	S_mic	S_mes	V_t	V_mic	V_mes
ZnO-CeO₂-IM	48	—	48	0.42	—	0.42
ZnO-CeO₂-PM	43	—	43	0.49	—	0.49
ZnO-CeO₂-CP	64	—	64	0.51	—	0.51
ZnO-CeO₂-PC	55	14	41	0.42	0.10	0.32
CeO₂	87	—	87	0.23	—	0.23

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