High catalytic performance of CuCe/Ti for CO oxidation and the role of TiO2

doi:10.1016/j.cjche.2023.08.004

Chinese Journal of Chemical Engineering ›› 2023, Vol. 62 ›› Issue (10): 1-10.DOI: 10.1016/j.cjche.2023.08.004

High catalytic performance of CuCe/Ti for CO oxidation and the role of TiO₂

Tingting Chang¹, Ziyan Wang², Zhimiao Wang^1,3, Hualiang An^1,3, Fang Li^1,3, Wei Xue^1,3, Yanji Wang^1,3,4

1. Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China;
2. Purification Equipment Research Institute of CSIC, Handan 056027, China;
3. Tianjin Key Laboratory of Chemical Process Safety, Tianjin 300130, China;
4. Hebei Industrial Technology Research Institute of Green Chemical Industry, Huanghua 061100, China

Received:2023-02-20 Revised:2023-08-20 Online:2023-12-23 Published:2023-10-28
Contact: Fang Li,E-mail:lifang@hebut.edu.cn;Wei Xue,E-mail:weixue@hebut.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (U21A20306, U20A20152) and Natural Science Foundation of Hebei Province (B2022202077). We thank Ian McNaught, Ph.D., from Liwen Bianji, (Edanz) China (www.liwenbianji.cn/), for editing the English text of a draft of this manuscript.

High catalytic performance of CuCe/Ti for CO oxidation and the role of TiO₂

Tingting Chang¹, Ziyan Wang², Zhimiao Wang^1,3, Hualiang An^1,3, Fang Li^1,3, Wei Xue^1,3, Yanji Wang^1,3,4

1. Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China;
2. Purification Equipment Research Institute of CSIC, Handan 056027, China;
3. Tianjin Key Laboratory of Chemical Process Safety, Tianjin 300130, China;
4. Hebei Industrial Technology Research Institute of Green Chemical Industry, Huanghua 061100, China

通讯作者: Fang Li,E-mail:lifang@hebut.edu.cn;Wei Xue,E-mail:weixue@hebut.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (U21A20306, U20A20152) and Natural Science Foundation of Hebei Province (B2022202077). We thank Ian McNaught, Ph.D., from Liwen Bianji, (Edanz) China (www.liwenbianji.cn/), for editing the English text of a draft of this manuscript.

Abstract

Abstract: CuCe/Ti-A and CuCe/Ti-R catalysts were prepared using anatase TiO₂ (TiO₂-A) and rutile TiO₂ (TiO₂-R) as supports using the incipient wetness impregnation method for the carbon monoxide (CO) oxidation reaction and were compared with a CuCe-C catalyst prepared using the co-precipitation method. The CuCe/Ti-A catalyst exhibited the highest activity, with complete CO conversion at 90 ℃, when the gas hourly space velocity was 24000 ml·g^-1·h^-1 and the CO concentration was approximately 1% (vol). A series of characterizations of the catalysts revealed that the CuCe/Ti-A catalyst has a larger specific surface area, more Cu⁺ species and oxygen vacancies, and the Cu species of CuCe/Ti-A catalyst is more readily reduced. In situ FT-IR results indicate that the bicarbonate species generated on the CuCe/Ti-A catalyst have lower thermal stability than the carbonate species on CuCe/Ti-R, and will decompose more readily to form CO₂. Therefore, CuCe/Ti-A has excellent catalytic activity for CO oxidation.

Key words: CO oxidation, TiO₂ crystal phase, CuCe/Ti, Reaction mechanism

摘要： CuCe/Ti-A and CuCe/Ti-R catalysts were prepared using anatase TiO₂ (TiO₂-A) and rutile TiO₂ (TiO₂-R) as supports using the incipient wetness impregnation method for the carbon monoxide (CO) oxidation reaction and were compared with a CuCe-C catalyst prepared using the co-precipitation method. The CuCe/Ti-A catalyst exhibited the highest activity, with complete CO conversion at 90 ℃, when the gas hourly space velocity was 24000 ml·g^-1·h^-1 and the CO concentration was approximately 1% (vol). A series of characterizations of the catalysts revealed that the CuCe/Ti-A catalyst has a larger specific surface area, more Cu⁺ species and oxygen vacancies, and the Cu species of CuCe/Ti-A catalyst is more readily reduced. In situ FT-IR results indicate that the bicarbonate species generated on the CuCe/Ti-A catalyst have lower thermal stability than the carbonate species on CuCe/Ti-R, and will decompose more readily to form CO₂. Therefore, CuCe/Ti-A has excellent catalytic activity for CO oxidation.

关键词: CO oxidation, TiO₂ crystal phase, CuCe/Ti, Reaction mechanism

Tingting Chang, Ziyan Wang, Zhimiao Wang, Hualiang An, Fang Li, Wei Xue, Yanji Wang. High catalytic performance of CuCe/Ti for CO oxidation and the role of TiO₂[J]. Chinese Journal of Chemical Engineering, 2023, 62(10): 1-10.

Tingting Chang, Ziyan Wang, Zhimiao Wang, Hualiang An, Fang Li, Wei Xue, Yanji Wang. High catalytic performance of CuCe/Ti for CO oxidation and the role of TiO₂[J]. 中国化学工程学报, 2023, 62(10): 1-10.

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High catalytic performance of CuCe/Ti for CO oxidation and the role of TiO₂

High catalytic performance of CuCe/Ti for CO oxidation and the role of TiO₂

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