Promoting role of potassium in the reverse water gas shift reaction on Pt/mullite catalyst

被引：96
|
作者：
Liang, Binglian [1 ,2 ]
Duan, Hongmin [1 ]
Su, Xiong [1 ]
Chen, Xiaodong [1 ,2 ]
Huang, Yanqiang [1 ]
Chen, Xiaowei [3 ]
Jose Delgado, Juan [3 ]
Zhang, Tao [1 ]
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, 457 Zhongshan Rd, Dalian 116023, Peoples R China
[2] Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
[3] Univ Cadiz, Fac Ciencias, Dept Ciencia Mat & Ingn Met & Quim Inorgan, Cadiz, Spain
来源：
CATALYSIS TODAY | 2017年 / 281卷
基金：
中国国家自然科学基金;
关键词：
Reverse water gas shift reaction; Potassium; Platinum; Mullite; CARBON-DIOXIDE HYDROGENATION; PALLADIUM CATALYSTS; CO2; HYDROGENATION; PT/TIO2; CATALYSTS; PARTICLE-SIZE; FORM METHANOL; REDUCTION; MECHANISM; OXIDATION; COADSORPTION;
D O I：
10.1016/j.cattod.2016.02.051
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The promotional effect of potassium in the reverse water gas shift reaction (RWGS) was studied for Pt/mullite catalyst. The addition of potassium on Pt/mullite significantly enhanced the CO2 conversion and hindered the formation of methane as a by-product. The turnover frequency (TOF) at 340 degrees C was enhanced by potassium up to 7 times that of Pt/mullite. TEM observations indicated a slight Pt particle size growth on the K-promoted sample. Characterization results by means of H-2-TPR and XPS revealed the strong interaction between KOx and Pt, which stabilized the Pt in a higher oxidation state. DRIFTS observation under the RWGS conditions suggested that the newly created interface between KOx and Pt served as the active site for formate decomposition to produce CO. The presence of potassium also weakened the strength of CO adsorption on Pt, which hindered the further hydrogenation of CO into CH4 through C-O bond dissociation. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：319 / 326
页数：8
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