000			01468nab a2200193 4500
005			20260520000815.0
008			260224s2009 xxu
245	0	0	_aCombustion of methane in lean mixtures over bulk transition-metal oxides _bEvaluation of the activity and self-deactivation
260			_a _b _cene. 2009
270			_a14/04/2009 ; 14/04/2009
300			_a7 p. ; 86-93
520			_aTranscripción 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.
773	0		_tEnergy & fuels _g23
942			_cARTICULO
100	1		_aParedes, José R. _940836
100	1		_aDíaz, Eva _940837
100	1		_aDíez, Fernando V. _940838
999			_c169544 _d169544