A kinetic investigation of the reduction of NO by CH4 on silica and alumina-supported Pt catalysts

Burch, R.; Ramli, Anita

doi:10.1016/s0926-3373(97)00037-4

Cited by 37 publications

(16 citation statements)

References 22 publications

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“…The NO-CH 4 reaction over Pt/Al 2 O 3 has been investigated by Burch and Ramli [19,20] and by Balint and coworkers [26], but these reports mainly focused on experiments under rich conditions, and catalytic activity under stoichiometric conditions and the differences between the NO-CH 4 and the NO-O 2 -CH 4 reactions remained unclear. The high NO x and CH 4 conversion in the NO-CH 4 reaction under stoichiometric conditions observed in the present study may be explained as follows.…”

Section: Discussionmentioning

confidence: 99%

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Pt-Rh/CeO2-Al2O3 for Controlling Emissions from Natural Gas Engines: Three-Way Catalytic Activity at Low Temperatures and Effects of SO2 Aging

Ohtsuka

2014

Emiss. Control Sci. Technol.

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The three-way catalytic activity of Pt-Rh/CeO 2 -Al 2 O 3 was examined at temperatures below 500°C under conditions simulating gas engine exhaust, and the results were compared with those of O 2 -CH 4 , NO-O 2 -CH 4 , and NO-CH 4 model reactions. The catalyst exhibited sufficient three-way catalytic activity, even at 400°C, in the absence of SO 2 . After SO 2 aging, the activity under stoichiometric conditions remarkably decreased. In addition, methane conversion under rich (reducing) conditions severely decreased after SO 2 aging due to the suppression of steam methane reforming by sulfur poisoning.

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Section: Discussionmentioning

confidence: 99%

“…However, the temperature examined in their study was limited to 550°C, and activity at lower temperatures was not examined. Oh [19,20]. They determined that Pt had the highest activity, which was an order of magnitude higher than those of Pd and Rh.…”

Section: Introductionmentioning

confidence: 99%

Pt-Rh/CeO2-Al2O3 for Controlling Emissions from Natural Gas Engines: Three-Way Catalytic Activity at Low Temperatures and Effects of SO2 Aging

Ohtsuka

2014

Emiss. Control Sci. Technol.

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“…As such they have received much regulatory and research attention. Hydrocarbons in particular have been studied as potential NO x reducing agents, with methane being a focus due to its relative low cost and widespread availability [1][2][3][4][5]. A significant challenge to the use of methane as a reducing agent is the presence of excess oxygen (lean conditions) in many combustion exhaust streams, as under lean conditions methane tends to preferentially combust with oxygen [6,7].…”

Section: Introductionmentioning

confidence: 99%

Pd-supported on sulfated monoclinic zirconia for the reduction of NO2 with methane under lean conditions

2006

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NO 2 reduction with methane under lean conditions is studied as a part of a two-stage scheme where NO is first oxidized to NO 2 over an oxidation catalyst and NO 2 is subsequently reduced to N 2 over a reduction catalyst. Pd supported on a sulfated monoclinic zirconia support was observed to have good activity for the reduction of NO 2 with CH 4 under lean conditions, giving N 2 yields over 60% over a broad temperature range below 450°C. Sulfate groups are shown to be thermally stable below the calcination temperature.

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“…Subramanian et al [17] reported high conversion efficiencies for Pd-based catalysts, and recent systematic studies of silica or alumina supported Pd, Pt and Rh catalysts have been reported by Burch et al [18,19]. Measurements were made both in the absence and in the presence of oxygen.…”

Section: Introductionmentioning

confidence: 99%

The effect of sodium on the Pd-catalyzed reduction of NO by methane

Yentekakis

Lambert

Konsolakis

et al. 1998

Applied Catalysis B: Environmental

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The kinetics of NO reduction by methane over Pd catalysts supported on 8 mol% yttria-stabilised zirconia (YSZ) has been studied at atmospheric pressure in the 620±770 K temperature range. Langmuir±Hinshelwood type kinetics are found with characteristic rate maxima re¯ecting competitive adsorption of NO and methane: NO adsorption is much more pronounced than that of methane within the temperature range of this investigation. Pd is an effective catalyst: 100% selectivity towards N 2 can be achieved at 100% conversion of NO over this wide temperature range. Sodium causes strong poisoning of the reaction. The response of the system to variations in NO and methane concentrations, temperature, and sodium loading indicate that this is due to the Na-induced enhancement of NO chemisorption and dissociation relative to methane adsorption, i.e. sodium enhances oxygen poisoning of the catalyst. These results stand in revealing contrast to the strong promotional effect of sodium in the reduction of NO by propene over the same catalysts. The very different response of the two hydrocarbon reductants to Na doping of the Pd catalyst receives a consistent explanation. #

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A kinetic investigation of the reduction of NO by CH4 on silica and alumina-supported Pt catalysts

Cited by 37 publications

References 22 publications

Pt-Rh/CeO2-Al2O3 for Controlling Emissions from Natural Gas Engines: Three-Way Catalytic Activity at Low Temperatures and Effects of SO2 Aging

Pt-Rh/CeO2-Al2O3 for Controlling Emissions from Natural Gas Engines: Three-Way Catalytic Activity at Low Temperatures and Effects of SO2 Aging

Pd-supported on sulfated monoclinic zirconia for the reduction of NO2 with methane under lean conditions

The effect of sodium on the Pd-catalyzed reduction of NO by methane

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