Insight into the improvement effect of the Ce doping into the SnO2 catalyst for the catalytic combustion of methane

被引：126

作者：

Liu, Cheng ^{[1
]}

Xian, Hui ^{[2
]}

Jiang, Zheng ^{[3
]}

Wang, Lihua ^{[3
]}

Zhang, Jing ^{[4
]}

Zheng, Lirong ^{[4
]}

Tan, Yisheng ^{[5
]}

Li, Xingang ^{[1
]}

机构：

[1] Tianjin Univ, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin Key Lab Appl Catalysis Sci & Technol, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China

[2] Tianjin Polytech Univ, Sch Comp Sci & Software Engn, Tianjin 300387, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201800, Peoples R China

[4] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[5] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2015年 / 176卷

基金：

中国国家自然科学基金;

关键词：

Ce dopant; SnO2; catalyst; Catalytic combustion of methane; Surface Sn4+ cations; Mars-van Krevelen model; MIXED-OXIDE CATALYSTS; HIGH-SURFACE-AREA; LOW-TEMPERATURE; RAMAN-SPECTROSCOPY; PARTIAL OXIDATION; COMPOSITE OXIDE; SOLID-SOLUTION; TURNOVER RATE; CO OXIDATION; METAL-OXIDES;

D O I：

10.1016/j.apcatb.2015.04.042

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Herein, we report the performance of the catalytic combustion of methane over the Ce-doped SnO2 catalysts. Doping with Ce increases the surface areas, decreases the crystallite sizes, and activates both the surface metal cations and surface oxygen species. Upon methane combustion, the surface Sn4+ cations are active sites, and the surface lattice oxygen plays an important role, as well. Kinetics results suggest that the activation energy (E-a) and pre-exponential factor (A) are determined by the reducibility and the area-specific quantity of the surface Sn4+ cations, respectively. The Sn0.7Ce0.3O2 catalyst exhibits the highest area-specific rate because of its lowest E-a and relatively bigger A values. Its turnover frequency is five times higher, as compared with the SnO2. The reaction pathways upon the Sn-rich catalysts (SnO2 phase) follow the Mars-van Krevelen model, while they become more complex upon the Ce-rich ones (CeO2 phase). Additionally, these SnO2-based catalysts display the high water resistance. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：542 / 552

页数：11

共 59 条

[1] Dual-templating synthesis of three-dimensionally ordered macroporous La0.6Sr0.4MnO3-supported Ag nanoparticles: controllable alignments and super performance for the catalytic combustion of methane [J].