Combustion of Methane in Lean Mixtures over Bulk Transition-Metal Oxides: Evaluation of the Activity and Self-Deactivation

被引：68

作者：

Paredes, Jose R. ^{[1
]}

Diaz, Eva ^{[1
]}

Diez, Fernando V. ^{[1
]}

Ordonez, Salvador ^{[1
]}

机构：

[1] Univ Oviedo, Dept Chem Engn & Environm Technol, E-33006 Oviedo, Spain

来源：

ENERGY & FUELS | 2009年 / 23卷 / 1-2期

关键词：

PROGRAMMED REDUCTION PROFILES; HIGH-TEMPERATURE COMBUSTION; VOLATILE ORGANIC-COMPOUNDS; CATALYTIC COMBUSTION; RED MUD; OXIDATION; NICKEL; IRON; MN; LA;

D O I：

10.1021/ef800704e

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Different bulk transition-metal oxides (NiO, CuO, Mn2O3, Cr2O3, and C0304) were prepared, by precipitation from nitrate precursors, and tested for the combustion of methane-air lean mixtures (1000-5000 ppmv of CH4). Catalyst performances were compared in terms of both intrinsic activity and resistance to self-deactivation. Methane combustion experiments were carried out at ambient pressure and a space velocity of 62 h(-1) [weight hourly space velocity (WHSV)]. The activity of the studied catalysts (determined by the recording of light-off curves in the interval of 250-600 degrees C decreases in the order: Co3O4 > Mn2O2 > Cr2O3 > CuO > NiO. However, deactivation studies, carried out both at constant temperature (620 degrees C) and in hysteresis experiments, reveal that Mn2O3 is the most stable catalyst.

引用

页码：86 / 93

页数：8

共 39 条

[1] A new method for enhancing the performance of red mud as a hydrogenation catalyst [J].