01468nab a2200193 4500 20260520000815.0 260224s2009 xxu Combustion of methane in lean mixtures over bulk transition-metal oxides Evaluation of the activity and self-deactivation ene. 2009 14/04/2009 ; 14/04/2009 7 p. ; 86-93 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. Energy & fuels 23 ARTICULO Paredes, José R. 40836 Díaz, Eva 40837 Díez, Fernando V. 40838 169544 169544 0 0 0 0 237363 BAAB BAAB 2026-03-05 200044346 0 200044346 2026-03-05 15:11:45 2026-03-05 ARTICULO