Complete oxidation of methane at low temperature over Pt and Pd catalysts for the abatement of lean-burn natural gas fuelled vehicles emissions: influence of water and sulphur containing compounds

Gélin, P.; Urfels, Laetitia; Primet, Michel; Tena, Emmanuel

doi:10.1016/s0920-5861(03)00215-3

Cited by 253 publications

(176 citation statements)

References 27 publications

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“…9b). These gas compositions are typically used in the evaluation of catalytic performance of Pd-and Pt-based catalysts for a complete oxidation of CH 4 in the exhaust of engines of natural gas [11][12][13] (Fig. 9b).…”

Section: Resultsmentioning

confidence: 99%

“…Use of natural gas vehicles is a programme launched in Europe and other countries towards diversity of energy sources and utilization of methane, the inexpensive, earth-abundant energy sources [9][10][11][12] . The exhaust of natural gas engines has the following features 9 : low temperature (o500-550°C), low CH 4 concentration (about 1,000 p.p.m.…”

mentioning

confidence: 99%

“…), large amount of water vapour (10%), high O 2 :CH 4 ratio, and presence of NO x or SO x (refs 9,12). A complete oxidation of methane at a relatively low temperature (o500-550°C) is critical for abating unburned methane of the exhaust of engines of natural gas vehicles 9,[11][12][13] . Pt and Pd supported on Al 2 O 3 are the well-studied catalysts 9 .…”

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confidence: 99%

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Understanding complete oxidation of methane on spinel oxides at a molecular level

et al. 2015

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It is crucial to develop a catalyst made of earth-abundant elements highly active for a complete oxidation of methane at a relatively low temperature. NiCo 2 O 4 consisting of earth-abundant elements which can completely oxidize methane in the temperature range of 350-550°C. Being a cost-effective catalyst, NiCo 2 O 4 exhibits activity higher than precious-metal-based catalysts. Here we report that the higher catalytic activity at the relatively low temperature results from the integration of nickel cations, cobalt cations and surface lattice oxygen atoms/oxygen vacancies at the atomic scale. In situ studies of complete oxidation of methane on NiCo 2 O 4 and theoretical simulations show that methane dissociates to methyl on nickel cations and then couple with surface lattice oxygen atoms to form -CH 3 O with a following dehydrogenation to À CH 2 O; a following oxidative dehydrogenation forms CHO; CHO is transformed to product molecules through two different sub-pathways including dehydrogenation of OCHO and CO oxidation.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Understanding complete oxidation of methane on spinel oxides at a molecular level

et al. 2015

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“…3) assuming that the spherical metal particles were equally distributed over the support. Based on the particle size, noble metal dispersion was derived using a relation (16) given in the study by Gremminger et al [35]:…”

Section: Kinetic Model For Methane Oxidation Under Dry and Wet Conditmentioning

confidence: 99%

“…However, the catalytic activity of these systems is decreasing with time-on-stream and significant research has been addressed to understand the mechanism of Pdbased catalyst deactivation during the methane oxidation. The water inhibition effect has been discussed extensively [4][5][6][7][8][9][10][11][12][13][14][15] and the formation of surface hydroxyls is considered to be a key deactivation pathway, which results in the slow deactivation of the catalyst due to the continuous formation and accumulation of these surface species [8,16]. Moreover, it was shown that competitive adsorption between methane and water molecules plays a role in the catalytic activity loss [5,9,15,17,18].…”

Section: Introductionmentioning

confidence: 99%