Porous Ag-Fe2O3 nanocomposite catalysts for the oxidation of carbon monoxide

被引：46

作者：

Narasimharao, Katabathini ^{[1
]}

Al-Shehri, Abdulmohsen ^{[1
]}

Al-Thabaiti, Shaeel ^{[1
]}

机构：

[1] King Abdulaziz Univ, Dept Chem, Fac Sci, Jeddah 21589, Saudi Arabia

来源：

APPLIED CATALYSIS A-GENERAL | 2015年 / 505卷

关键词：

Ag-Fe2O3; Nanocomposites; Carbon monoxide; Oxidation; TEMPERATURE CO OXIDATION; REPORTING PHYSISORPTION DATA; SUPPORTED GOLD CATALYSTS; GAS SOLID SYSTEMS; AG NANOPARTICLES; THERMAL-DECOMPOSITION; ELECTROLYTIC SILVER; PYROLYTIC-GRAPHITE; AG/CEO2; CATALYSTS; COMPOSITE OXIDES;

D O I：

10.1016/j.apcata.2015.05.017

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：

Ag-Fe2O3 nanocomposites were synthesized and characterized by means of different analytical techniques; X-ray diffraction, Raman spectroscopy, transmission electron microscopy, diffuse reflectance UV-vis spectroscopy, N-2-physisorption, X-ray photoelectron spectroscopy and H-2-temperature programmed reduction. Catalytic activities of the synthesized materials were evaluated for CO oxidation. It was shown that catalytic performance of xAg-Fe (x = 1, 3, 5, 7 and 10 wt.% Ag) depends strongly on Ag loading, among which 5Ag-Fe and 7Ag-Fe displayed the best catalytic activity for CO oxidation. The experiments show that Ag-Fe nanocomposite has a good reproducibility and stability in CO oxidation. Comparison of catalytic, structural and spectroscopic measurements suggest that Ag ions are dispersed inside Fe2O3 mesopores or on the external support surface, as well as charged Ag-Fe interactive species to be the active states of Ag in the CO oxidation process. The mesoporous nature and higher specific surface areas of the Ag-Fe nanocomposite lead to an increase in active surface for the reaction. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：431 / 440

页数：10

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