Reactant adsorption modulation by Fe and K in Pt catalyst for highly effective CO preferential oxidation in practical conditions

被引：31

作者：

Cao, Jianlin ^{[1
]}

Zhang, Xiaoqian ^{[1
]}

Ou, Xinxin ^{[1
]}

Liu, Tao ^{[3
]}

Xing, Tao ^{[3
]}

Li, Zhi ^{[3
]}

Zhou, Xin ^{[1
]}

Yan, Hao ^{[1
]}

Liu, Yibin ^{[1
]}

Feng, Xiang ^{[1
]}

Tuo, Yongxiao ^{[2
]}

Yang, Chaohe ^{[1
]}

Chen, De ^{[1
,4
]}

机构：

[1] China Univ Petr, State Key Lab Heavy Oil Proc, Qingdao 266580, Shandong, Peoples R China

[2] China Univ Petr, Coll New Energy, Qingdao 266580, Shandong, Peoples R China

[3] Shandong Energy Grp Co Ltd, Jinan 250000, Shandong, Peoples R China

[4] Norwegian Univ Sci & Technol, Dept Chem Engn, N-7491 Trondheim, Norway

来源：

CHEMICAL ENGINEERING JOURNAL | 2022年 / 444卷

关键词：

CO preferential oxidation; High CO2 selectivity; High temperature window; Platinum catalyst; Adsorption properties; FISCHER-TROPSCH SYNTHESIS; CARBON-MONOXIDE; FUEL-CELLS; HYDROGEN; GAS; SURFACE; NANOPARTICLES; PURIFICATION; METHANATION; PERFORMANCE;

D O I：

10.1016/j.cej.2022.136661

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Developing efficient and stable catalysts for preferential oxidation of CO (CO-PROX) within a wide temperature window is significant for the industrial hydrogen resource purification process. Herein, dual promoters of Fe and K were deliberately introduced to the mordenite supported Pt catalyst for optimizing the adsorption behaviors of reactants in CO-PROX. The optimal 1Pt0.1 K/Fe-MOR catalyst can achieve 100% CO conversion and 60-70% CO2 selectivity (the ratio of CO/O-2 is 1:1) under the realistic application temperature range (130-200 degrees C), and remains catalytically stable during 65 h testing at 140 degrees C. A combination of detailed characterizations and density functional theory (DFT) simulations show that Fe species can avoid the co-adsorption of O-2 on the Pt sites by providing more oxygen vacancy to activate O-2, while K species will further enhance the adsorption of CO and repulse the adsorption of H-2 on Pt surface. Therefore, the optimized adsorption of CO, O-2 and H-2 results in a total CO conversion and high CO2 selectivity in high temperature range.

引用

页数：9

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