CO oxidation over CuOx/TiO2 catalyst: The importance of oxygen vacancies and Cu plus species

被引：62

作者：

Chen, Wei ^{[1
]}

Xu, Jue ^{[1
]}

Huang, Fajun ^{[1
]}

Zhao, Chaoying ^{[1
]}

Guan, Yingqiao ^{[1
]}

Fang, Yarong ^{[1
]}

Hu, Jinpeng ^{[2
]}

Yang, Weiwei ^{[1
]}

Luo, Zhu ^{[1
]}

Guo, Yanbing ^{[1
]}

机构：

[1] Cent China Normal Univ, Inst Environm & Appl Chem, Coll Chem, Key Lab Pesticide & Chem Biol,Minist Educ, Wuhan 430079, Peoples R China

[2] Fujian Longxin 3D Array Technol Co Ltd, Longyan 364000, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2023年 / 618卷

基金：

中国国家自然科学基金;

关键词：

Oxygen vacancies; Cu plus; brookiteTiO2; CO oxidation; PHOTOCATALYTIC ACTIVITY; TRANSITION-METAL; TIO2; COPPER; SPECTROSCOPY; NANOSHEETS; BROOKITE; ANATASE; STATE; OXIDE;

D O I：

10.1016/j.apsusc.2023.156539

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：

It is well documented that the existence of oxygen vacancies and active Cu species can improve CO oxidation activity over TiO2 substrate. Herein, TiO2-supported copper catalysts (CuOx/TiO2) with different ratio of oxygen vacancies (Ov) and Cu+ has been synthesized. The existence and amount of Ov and Cu+ species were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance spectrum (EPR). The synergetic effect between Cu+ and oxygen vacancies was investigated in terms of O2 temperature-programmed desorption (O2-TPD), H2 temperature-programmed reduction (H2-TPR) and in situ DRIFTS spectra. Cu+ is the adsorption site for CO molecules, the abundant Ov can significantly activate molecular oxygen, which effectively oxidize the adsorbed CO molecules. The most suitable ratio between Cu+ and Ov has been confirmed. The CuOx/TiO2(Cu+ rich) catalyst (51% Cu+, 26.3% Ov) shows superior CO oxidation activity (T90 = 136 degrees C) compared to CuOx/TiO2(Ov rich) catalyst (39% Cu+, 28.5% Ov, T90 > 350 degrees C). This work provides comprehensive investigation of the role for abundant oxygen vacancies and Cu+ in CO oxidation reactions.

引用

页数：8

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