Effect of surface basicity over the supported Cu-ZnO catalysts on hydrogenation of CO2 to methanol

被引：46

作者：

Guo, Tan ^{[1
]}

Guo, Qing ^{[1
]}

Li, Shaozhong ^{[1
]}

Hu, Yongke ^{[1
]}

Yun, Shan ^{[1
]}

Qian, Yunhua ^{[1
]}

机构：

[1] Huaiyin Inst Technol, Natl & Local Joint Engn Res Ctr Mineral Salt Deep, Key Lab Palygorskite Sci & Appl Technol OfJ Angsu, Huaian 223003, Peoples R China

来源：

JOURNAL OF CATALYSIS | 2022年 / 407卷

关键词：

Cu-ZnO; Surface basicity; CO2; Hydrogenation; Methanol; COPPER-CATALYSTS; ACTIVE-SITES; ZR; PERFORMANCE; ADSORPTION; INDUSTRIAL; MECHANISM; INSIGHTS;

D O I：

10.1016/j.jcat.2022.01.035

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

CO2 hydrogenation to methanol can relieve energy shortage and weaken CO2 emission, and Cu-ZnO catalysts show excellent activity, in which the surface basicity improves conversion and selectivity, but the influence mechanism is often ignored. In this work, Cu-ZnO/Al2O3, Cu-ZnO/Al2O3-MgO and Cu-ZnO/MgO were prepared to study the effect of surface basicity on CO2 hydrogenation to methanol. It was found that MgO increased the dispersed CuO species and strengthened surface basicity, leading to higher SCu and electron density on Cu surface, respectively, which promoted CO2 conversion. Meanwhile, the surface basicity strengthened CO adsorption and weakened methanol adsorption, which greatly increased methanol selectivity. In addition, methanol adsorption on catalyst surface seriously inhibited CO2 adsorption, while the strong surface basicity greatly weakened the inhibition. Besides, the strong surface basicity inhibited the dissociation of methanol into CO species. Finally, the Cu-ZnO catalyst with strong surface basicity showed high activity and selectivity. (c) 2022 Elsevier Inc. All rights reserved.

引用

页码：312 / 321

页数：10

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