TY  - SER
AU  - Paredes,José R.
AU  - Díaz,Eva
AU  - Díez,Fernando V.
TI  - Combustion of methane in lean mixtures over bulk transition-metal oxides: Evaluation of the activity and self-deactivation
PY  - 2009///
CY  - 
PB  - 
N2  - Transcripción del resúmen publicado por el autor: Different bulk transition-metal oxides (NiO, CuO, Mn2O3, Cr2O3, and Co3O4) 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 °C) decreases in the order: Co3O4 > Mn2O2 > Cr2O3 > CuO > NiO. However, deactivation studies, carried out both at constant temperature (620 °C) and in hysteresis experiments, reveal that Mn2O3 is the most stable catalyst
ER  -