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

共 33 条

[21] Tuning defects in oxides at room temperature by lithium reduction [J].

Ou, Gang ;

Xu, Yushuai ;

Wen, Bo ;

Lin, Rui ;

Ge, Binghui ;

Tang, Yan ;

Liang, Yuwei ;

Yang, Cheng ;

Huang, Kai ;

Zu, Di ;

Yu, Rong ;

Chen, Wenxing ;

Li, Jun ;

Wu, Hui ;

Liu, Li-Min ;

Li, Yadong .

NATURE COMMUNICATIONS, 2018, 9

[22] A facile and versatile method for preparation of colored TiO2 with enhanced solar-driven photocatalytic activity [J].

Tan, Huaqiao ;

Zhao, Zhao ;

Niu, Mang ;

Mao, Chengyu ;

Cao, Dapeng ;

Cheng, Daojian ;

Feng, Pingyun ;

Sun, Zaicheng .

NANOSCALE, 2014, 6 (17) :10216-10223

[23] Active Site Considerations on the Photocatalytic H2 Evolution Performance of Cu-Doped TiO2 Obtained by Different Doping Methods [J].

Valero, Juan M. ;

Obregon, Sergio ;

Colon, Gerardo .

ACS CATALYSIS, 2014, 4 (10) :3320-3329

[24] Unconventional Route to Oxygen-Vacancy-Enabled Highly Efficient Electron Extraction and Transport in Perovskite Solar Cells [J].

Wang, Bing ;

Zhang, Meng ;

Cui, Xun ;

Wang, Zewei ;

Rager, Matthew ;

Yang, Yingkui ;

Zou, Zhigang ;

Wang, Zhong Lin ;

Lin, Zhiqun .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2020, 59 (04) :1611-1618

[25] One-pot synthesis of ultrafine NiO loaded and Ti3+ in-situ doped TiO2 induced by cyclodextrin for efficient visible-light photodegradation of hydrophobic pollutants [J].

Wang, Dandan ;

Li, Qiuju ;

Miao, Wei ;

Liu, Ying ;

Du, Ningjie ;

Mao, Shun .

CHEMICAL ENGINEERING JOURNAL, 2020, 402 (402)

[26] Crystal Plane Effect of Ceria on Supported Copper Oxide Cluster Catalyst for CO Oxidation: Importance of Metal-Support Interaction [J].

Wang, Wei-Wei ;

Yu, Wen-Zhu ;

Du, Pei-Pei ;

Xu, Hui ;

Jin, Zhao ;

Si, Rui ;

Ma, Chao ;

Shi, Shuo ;

Jia, Chun-Jiang ;

Yan, Chun-Hua .

ACS CATALYSIS, 2017, 7 (02) :1313-1329

[27] Frustrated Lewis Pairs Accelerating CO2 Reduction on Oxyhydroxide Photocatalysts with Surface Lattice Hydroxyls as a Solid-State Proton Donor [J].

Wang, Xiaohui ;

Lu, Lei ;

Wang, Bing ;

Xu, Zhe ;

Xin, Zhenyu ;

Yan, Shicheng ;

Geng, Zhirong ;

Zou, Zhigang .

ADVANCED FUNCTIONAL MATERIALS, 2018, 28 (43)

[28] Atomic Substitution Enabled Synthesis of Vacancy-Rich Two-Dimensional Black TiO2-x Nanoflakes for High-Performance Rechargeable Magnesium Batteries [J].

Wang, Yanrong ;

Xue, Xiaolan ;

Liu, Pingying ;

Wang, Caixing ;

Yi, Xu ;

Hu, Yi ;

Ma, Lianbo ;

Zhu, Guoyin ;

Chen, Renpeng ;

Chen, Tao ;

Ma, Jing ;

Liu, Jie ;

Jin, Zhong .

ACS NANO, 2018, 12 (12) :12492-12502

[29] Low temperature CO oxidation on Cu-Cu2O/TiO2 catalyst prepared by photodeposition [J].

Wu, Guangjun ;

Guan, Naijia ;

Li, Landong .

CATALYSIS SCIENCE & TECHNOLOGY, 2011, 1 (04) :601-608

[30] Size Dependence of Defect-Induced Room Temperature Ferromagnetism in Undoped ZnO Nanoparticles [J].

Xu, Xiaoyong ;

Xu, Chunxiang ;

Dai, Jun ;

Hu, Jingguo ;

Li, Fengji ;

Zhang, Sam .

JOURNAL OF PHYSICAL CHEMISTRY C, 2012, 116 (15) :8813-8818

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