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

被引：67
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
收藏
页码：86 / 93
页数：8
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