Identification of active sites for preferential oxidation of CO over Ru/TiO2 catalysts via tuning metal-support interaction

被引：12

作者：

Wu, Peipei ^{[1
,2
]}

Lyu, Shuaishuai ^{[3
]}

Tian, Ye ^{[1
,2
]}

Zhao, Dejian ^{[1
,2
]}

Ye, Jingwei ^{[1
,2
]}

She, Mengni ^{[1
,2
]}

Song, Song ^{[1
,2
]}

Ding, Tong ^{[1
,2
]}

Li, Xingang ^{[1
,2
]}

机构：

[1] Tianjin Univ, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Sch Chem Engn & Technol, State Key Lab Chem Engn,Haihe Lab Sustainable Chem, Tianjin 300350, Peoples R China

[2] Zhejiang Inst Tianjin Univ, Zhejiang Inst, Shaoxing 312300, Zhejiang, Peoples R China

[3] Sinopec RIPP, Res Inst Petr Proc, Beijing 100083, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 475卷

关键词：

Ru/TiO2; Metal-support interaction; Active sites; Langmuir-Hinshelwood model; preferential oxidation of CO; MEMBRANE FUEL-CELL; RU CATALYSTS; H-2-RICH STREAM; SINGLE-ATOMS; ULTRA-LOW; NANOPARTICLES; PERFORMANCE; METHANATION; ADSORPTION; HYDROGEN;

D O I：

10.1016/j.cej.2023.146051

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Preferential oxidation of CO (CO-PROX) is promising to purify H2 resources for proton-exchange membrane fuel cells with the challenges of identifying active sites and developing efficient catalysts. Herein, we report the high CO-PROX performance of Ru/TiO2 catalysts prepared by chemical-reduction method. The kinetic results reveal that the CO-PROX mechanism over the Ru/TiO2 catalysts follows the Langmuir-Hinshelwood model. We discover that Ru delta+ sites are more active for O2 activation and CO oxidation, while Ru0 sites prefer CO methanation in CO-PROX. The enhanced metal-support interaction (MSI) induces the formation of flat Ru nanoparticles, thereby increasing the number of interfacial Ru delta+ sites. Especially, compared with the conventional catalyst prepared by conventional wetness impregnation method, the as-synthesized RuTi-CR-R200 catalyst with strengthened MSI exhibits about 27 and 13 times higher reaction rate and intrinsic activity, respectively, for CO-PROX. To the best of our knowledge, our catalyst surpasses the catalytic performance of the reported Ru-based catalysts, and achieves 100% CO conversion in the wide temperature range of 90-150 degrees C, as well as high stability.

引用

页数：11

共 70 条

[1] Selective CO Methanation on Highly Active Ru/TiO2 Catalysts: Identifying the Physical Origin of the Observed Activation/Deactivation and Loss in Selectivity [J].