Effect of electron migration promoted by UV on catalytic oxidation of CO over Pt/TiO2 catalyst

被引：0

作者：

Liu X. ^{[1
]}

Liu B. ^{[1
]}

Wei J. ^{[2
]}

Yu M. ^{[2
]}

Ding L. ^{[3
]}

Yang B. ^{[2
]}

机构：

[1] School of Materials Science and Engineering, Central South University, Changsha

[2] MCC Changtian International Engineering Co. Ltd., Changsha

[3] School of Metallurgy and Resources, Anhui University of technology, Maanshan

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 08期

关键词：

CO catalytic oxidation; Pt/TiO[!sub]2[!/sub] catalyst; UV pretreatment;

D O I：

10.11817/j.issn.1672-7207.2023.08.010

中图分类号：

学科分类号：

摘要：

To improve the CO catalytic oxidation performance, the Pt/TiO2 catalyst was pretreated by ultraviolet irradiation in the liquid phase to facilitate the electron hole migration rate, which induced the growth of Pt0 particles. Pt/TiO2 catalysts with different UV irradiation time were prepared. The catalytic oxidation and reducibility of the samples were tested, and the active particle diameter, metal dispersion and element valence on the surface of the samples were characterized. Consequently, the influence of CO catalytic reaction mechanism was studied by in-situ DRIFT spectroscopy. The results show that the Pt particle size on catalyst is 1−2 nm. The Pt/TiO2 with the largest Pt nanoparticles achieves the best catalytic performance for CO after UV pretreatment for 8 h. The complete conversion temperature of CO is reduced by 45 ℃, and the TOF value of the active sites is increased by 15 times. Moreover, analysis of reaction mechanism demonstrates that UV irradiation can reduce the occurrence of side reactions and improve CO conversion. © 2023 Central South University of Technology. All rights reserved.

引用

页码：3058 / 3069

页数：11

共 45 条

[1] ZHANG Qi, MO Shengpeng, LI Jiaqi, Et al., In situ DRIFT spectroscopy insights into the reaction mechanism of CO and toluene co-oxidation over Pt-based catalysts, Catalysis Science & Technology, 9, 17, pp. 4538-4551, (2019)
[2] XIE Shaohua, WANG Zhiwei, TAN Wei, Et al., Highly active and stable palladium catalysts on novel ceria-alumina supports for efficient oxidation of carbon monoxide and hydrocarbons, Environmental Science & Technology, 55, 11, (2021)
[3] DELIZ C H., Carbon monoxide converter emission by osmium support in zirconium dioxide[J], Journal of Industrial Pollution Control, 37, 7, (2021)
[4] CAMPOSECO R, TORRES A E, ZANELLA R., Influence of the preparation method of Au, Pd, Pt, and Rh/TiO2 nanostructures and their catalytic activity on the CO oxidation at low temperature[J], Topics in Catalysis, 65, (2022)
[5] DEY S, DHAL G C, MOHAN D, Et al., Synthesis and characterization of AgCoO2 catalyst for oxidation of CO at a low temperature, Polyhedron, 155, (2018)
[6] PANAGIOTOPOULOU P, KONDARIDES D I., Effect of the nature of the support on the catalytic performance of noble metal catalysts for the water-gas shift reaction, Catalysis Today, 112, (2006)
[7] PAN Yunxiang, SUN Zhengqing, CONG Huaiping, Et al., Photocatalytic CO2 reduction highly enhanced by oxygen vacancies on Pt-nanoparticle-dispersed gallium oxide[J], Nano Research, 9, 6, (2016)
[8] WANG Zhe, WANG Chunpeng, MAO Shanjun, Et al., Decoupling the electronic and geometric effects of Pt catalysts in selective hydrogenation reaction, Nature Communications, 13, (2022)
[9] CARP O, HUISMAN C L, RELLER A., Photoinduced reactivity of titanium dioxide[J], Progress in Solid State Chemistry, 32, (2004)
[10] PANAGIOTOPOULOU P, CHRISTODOULAKIS A, KONDARIDES D I, Et al., Particle size effects on the reducibility of titanium dioxide and its relation to the water-gas shift activity of Pt/TiO2 catalysts, Journal of Catalysis, 240, 2, (2006)

← 1 2 3 4 5 →