Catalytic combustion of methane over bimetallic catalysts a comparison between a novel annular reactor and a high-pressure reactor

Ersson, Anders; Kušar, Henrik; Carroni, Richard; Griffin, Timothy; Järås, Sven

doi:10.1016/s0920-5861(03)00247-5

Cited by 63 publications

(36 citation statements)

References 21 publications

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“…For Pt mass fractions higher than 20% only one reduction step was observed at lower temperatures. This behavior was also reported by others [4] and can be attributed to the promotion of PdO reduction by platinum addition.…”

Section: Catalyst Characterizationsupporting

confidence: 86%

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Flame-made Alumina Supported Pd–Pt Nanoparticles: Structural Properties and Catalytic Behavior in Methane Combustion

et al. 2005

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Bimetallic palladium-platinum nanoparticles supported on alumina were prepared by flame spray pyrolysis. The as-prepared materials were characterized by scanning transmission electron microscopy (STEM), CO chemisorption, nitrogen adsorption (BET), X-ray diffraction (XRD), temperature programmed reduction (TPR), thermogravimetric analysis (TGA) and extended X-ray absorption fine structure (EXAFS) spectroscopy. The materials were tested for the catalytic combustion of methane with a focus on the thermal stability of the noble metal particles. After flame synthesis the noble metal components of the materials were predominantly in oxidized state and finely dispersed on the alumina matrix. Reduction afforded small bimetallic Pd-Pt alloy particles (<5 nm) supported on Al 2 O 3 ceramic nanoparticles. The addition of small amounts of platinum made the palladium particles more resistant against sintering at high temperatures and further lowered the deactivation observed during methane combustion.

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Section: Catalyst Characterizationsupporting

confidence: 86%

“…has been proposed by several authors. Ersson et al [4] studied the influence of Pt and Rh on the behavior of Pd/Al 2 O 3 catalysts and found an increased stability when Pt was used as a co-metal. Narui et al [5] observed decreased sintering of the metal particles when platinum was added to palladium.…”

Section: Introductionmentioning

confidence: 99%

Flame-made Alumina Supported Pd–Pt Nanoparticles: Structural Properties and Catalytic Behavior in Methane Combustion

et al. 2005

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“…27 Previous reports preferred ZrO2 support for Rh catalysts, in order to avoid detrimental interaction between Rh and alumina (Al2O3), that reduces the activity of the catalyst. 28 However, the disadvantage of ZrO2 is low surface area compared to other supports. 28 But TiO2 with its bare outer surface and with less number of free defective hydroxyl groups might be inadequate to adsorb sufficient amount of Pt and Rh precursors to form bimetal particles and hence conversion is not exceeding 50%.…”

Section: Resultsmentioning

confidence: 99%

“…28 However, the disadvantage of ZrO2 is low surface area compared to other supports. 28 But TiO2 with its bare outer surface and with less number of free defective hydroxyl groups might be inadequate to adsorb sufficient amount of Pt and Rh precursors to form bimetal particles and hence conversion is not exceeding 50%. Hence this study clearly demonstrates both Al2O3 and ZrO2 are better supports than TiO2.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4] Among the noble-metal catalysts, palladium and platinum on various wash coats have been reported as the most active catalysts for methane combustion, due to their high thermal stability, but easily deactivated by sulphur poison. [5][6][7][8][9][10][11] Recent reports portray that bimetallic catalysts exhibit better properties like improved activity, selectivity, and thermal stability than monometallic catalysts. Many reports revealed the improved activity of Pt-Pd bimetallic catalysts over monometallic Pd catalysts, [12][13][14] as metal-metal interactions are believed to overcome deactivation of catalysts with time on stream.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Bimetallic Pt-Rh and Trimetallic Pt-Pd-Rh Catalysts for Low Temperature Catalytic Combustion of Methane

Bhagiyalakshmi¹,

Anuradha²,

Park³

et al. 2010

Bulletin of the Korean Chemical Society

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Monometallic, bimetallic and trimetallic particles consisting of different weight compositions of Pt-Pd-Rh over pure alumina wash coats have been synthesized and their catalytic performance on methane conversion was studied from 150 to 600 o C. Different catalyst formulations with variable Pt, Pd and Rh contents for bimetallic and trimetallic systems were tried and Pt(1.5)Rh(0.3)/Al2O3 and Pt(1.0)Pd(1.0)Rh(0.3)/Al2O3 shows low T50 and T90 temperatures. Bimetallic and trimetallic particle synergism acts as three way catalysts and therefore, all the catalysts show 100% methane conversion. The effect of supports such as ZrO2 and TiO2 on methane combustion was investigated; from T50 and T90 results both Al2O3 and ZrO2 are suitable supports for low temperature methane combustion.

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In situ Activation of Bimetallic Pd−Pt Methane Oxidation Catalysts

et al. 2020

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This study investigates possible pathways to reduce water inhibition over Pd−Pt methane oxidation catalysts supported on alumina and a ceria‐zirconia mixed oxide under conditions typical for lean burn gas engines. Spatially resolved concentration and temperature profiles reveal that addition of hydrogen to the lean reaction mixture leads to significant heat production and an increase in methane conversion. Moreover, reductive pulses during operation are not only able to regenerate the catalyst deactivated by water by removal of OH‐groups from the catalyst surface, but even promote its activity after repeated application of pulsing for several hours. X‐ray absorption spectroscopy reveals the formation of a partially reduced PdO−Pd mixture during the pulsing, which explains the increase in activity. This state of high activity is stable for several hours under the tested lean conditions. The results presented in this study suggest an efficient in situ activation strategy to overcome water inhibition of methane total oxidation over Pd−Pt catalysts by careful process control.

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Catalytic combustion of methane over bimetallic catalysts a comparison between a novel annular reactor and a high-pressure reactor

Cited by 63 publications

References 21 publications

Flame-made Alumina Supported Pd–Pt Nanoparticles: Structural Properties and Catalytic Behavior in Methane Combustion

Flame-made Alumina Supported Pd–Pt Nanoparticles: Structural Properties and Catalytic Behavior in Methane Combustion

Effect of Bimetallic Pt-Rh and Trimetallic Pt-Pd-Rh Catalysts for Low Temperature Catalytic Combustion of Methane

In situ Activation of Bimetallic Pd−Pt Methane Oxidation Catalysts

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