Palladium catalyst performance for methane emissions abatement from lean burn natural gas vehicles

Lampert, Jordan; Kazi, Monzure-Khoda; Farrauto, Robert J.

doi:10.1016/s0926-3373(97)00024-6

Cited by 342 publications

(212 citation statements)

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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%

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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%

“…), 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%

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

et al. 2015

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“…Due to the chemisorption reaction, sulfur forms chemical bonds with the active sites hindering desorption at typical operating conditions. Gradually, the catalyst is poisoned [17,25].…”

Section: Literature Overviewmentioning

confidence: 99%

“…In some cases [17,20,25,26], residual activities of fully poisoned PdO/Al 2 O 3 catalysts are observed. Two explanations can be found for this effect:…”

Section: Literature Overviewmentioning

confidence: 99%

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Studies on the influence of H 2 S and SO 2 on the activity of a PdO/Al 2 O 3 catalyst for removal of oxygen by total oxidation of (bio-)methane at very low O 2 :CH 4 ratios

Ortloff

Bohnau

Kramar

et al. 2016

Applied Catalysis B: Environmental

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This work focuses on the deactivation and in-situ regeneration effects of a commercial PdO/Al 2 O 3 catalyst for removal of oxygen by oxidation of CH 4 at low O 2 :CH 4 ratios when hydrogen sulfide and sulfur dioxide are applied. The experimental work is carried out at an operating temperature range of 200 °C < T < 300 °C, atmospheric pressures and H 2 S contents of < 50 ppmv. SO 2 and H 2 S show a different behavior in the examined range of operating conditions. Due to the low operating temperatures and low oxygen contents applied in this work, it was possible to identify an intermediate species, presumably PdSO 3 , with an increased activity for the oxidation of methane. This stands in contrast to the literature, where SO 2 typically causes catalyst deactivation. Based on the experimental results, a reaction scheme was derived and kinetic measurements for each of the participating reactions were carried out separately.

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Catalyst Deactivation

2009

Catalytic Air Pollution Control

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Palladium catalyst performance for methane emissions abatement from lean burn natural gas vehicles

Cited by 342 publications

References 20 publications

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

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

Studies on the influence of H 2 S and SO 2 on the activity of a PdO/Al 2 O 3 catalyst for removal of oxygen by total oxidation of (bio-)methane at very low O 2 :CH 4 ratios

Catalyst Deactivation

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