Surface engineering of CexBi1-xO2-δ nanorods rich in oxygen vacancies for enhancing photo-thermal synthesis of dimethyl carbonate from CO2/CH3OH

被引:8
作者
Guan, Xiushuai [1 ,2 ]
Jin, Shanbiao [1 ,2 ]
Liu, Le [2 ]
Zhao, Xiya [2 ]
Zhang, Xiaochao [1 ,2 ]
Zhang, Changming [3 ]
Li, Zhong [1 ,2 ]
Fan, Caimei [2 ]
机构
[1] Taiyuan Univ Technol, Key Lab Coal Sci & Technol, Minist Educ, Taiyuan 030024, Peoples R China
[2] Taiyuan Univ Technol, Coll Chem & Chem Engn, Taiyuan 030024, Peoples R China
[3] Taiyuan Univ Technol, Coll Min Engn, Taiyuan 030024, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Photo-thermal catalysis; Ce x Bi (1_x) O (2)_ delta nanorods; CO; 2; conversion; Dimethyl carbonate; Oxygen vacancy; ELECTRON-TRANSFER; METHANOL; PERFORMANCE; CATALYSTS; CO2;
D O I
10.1016/j.fuel.2023.130215
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The utilization of oxygen vacancies to modulate the surface properties of catalysts is a powerful way to enhance catalytic activity. In this work, the doping effect of Bi3+ on the performance of CeO2-delta (CexBi1-xO2-delta) hybrid nanorods with rich oxygen vacancies for the photo-thermal synthesis of dimethyl carbonate (DMC) from CO2/CH3OH (140 degree celsius, 1.6 MPa, 4 h) is systematically investigated. It is found that Ce0.9Bi0.1O2-delta exhibits the best catalytic performance, achieving a photo-thermal yield of 3.13 mmol center dot g(-1) without any dehydrating agent (1.14 times compared to thermal catalysis). It turns out that regulating the concentration of Bi3+ ions not only modifies the oxygen vacancy content, but also improves the light harvesting efficiency. Moreover, a series of characterization techniques, such as X-ray photoelectron spectroscopy, Raman spectrometer and electron paramagnetic resonance are employed to analyze and verify that the asymmetric oxygen vacancies are conducive to the improvement in the CO2 adsorption-activation. Finally, a possible reaction mechanism model of Bi3+ doping on CeO2-delta for the photo-thermal synthesis of DMC from CO2 and CH3OH is proposed. This work provides a practical approach to catalyst surface engineering design.
引用
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页数:9
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