Catalytic activity of spinel oxides MgCr2O4 and CoCr2O4 for methane combustion

被引：77

作者：

Hu, Jianan ^{[1
]}

Zhao, Wenyan ^{[1
]}

Hu, Ruisheng ^{[1
]}

Chang, Guiying ^{[1
]}

Li, Chun ^{[1
]}

Wang, Lingjie ^{[1
]}

机构：

[1] Inner Mongolia Univ, Sch Chem & Chem Engn, Key Lab Chem & Phys Rare Earth Mat, Hohhot 010021, Peoples R China

来源：

MATERIALS RESEARCH BULLETIN | 2014年 / 57卷

基金：

美国国家科学基金会;

关键词：

Composites; Sol-gel chemistry; X-ray diffraction; Catalytic properties; STRUCTURAL CHARACTERISTICS; SUPPORTED LAMNO3; MGAL2O4; SPINEL; MIXED OXIDES; PERFORMANCE; PEROVSKITE; OXIDATION; ROLES; ZR;

D O I：

10.1016/j.materresbull.2014.06.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The chrome-containing spinels, MgCr2O4 and CoCr2O4, were prepared via sol-gel method using glucose as a complexing agent after calcination at 1400 degrees C and investigated as catalysts for catalytic combustion of methane. XRD indicated that single phase spinel oxides of MgCr2O4 and CoCr2O4 had formed. XPS analysis exhibited that Cr3+ was present in both catalysts, whereas a small amount of Cr6+ was only detected in MgCr2O4. The spinel MgCr2O4 proved to be very active and its catalytic activity reached T-10 = 400 degrees C and T-90 = 684 degrees C for methane combustion, which was much superior to that of CoCr2O4 (T-10= 480 degrees C and T-90 = 750 degrees C). Larger surface area (1.1 m(2)/g), more flexible reactive surface oxygen species, and appropriate surface and bulk structure of MgCr2O4 may contribute to its excellent catalytic activity toward methane combustion. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：268 / 273

页数：6

共 31 条

[1] Effect of substitution of K+ ions on the structural and electrical properties of nanocrystalline MgAl2O4 spinel oxide [J].