Methane ignition catalyzed by in situ generated palladium nanoparticles

Shimizu, Tsutomu; Abid, Aamir D.; Poskrebyshev, Gregory A.; Wang, Shuangfeng; Nabity, James; Engel, J.R.; Yu, Jiang; Wickham, David; Devener, Brian Van; Anderson, Scott L.; Williams, Skip

doi:10.1016/j.combustflame.2009.07.012

Cited by 38 publications

(58 citation statements)

References 45 publications

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“…With increasing temperature the importance of the adsorption and desorption of oxygen reduces, while the oxidative adsorption of methane exerts a large impact. We note in passing that simulations with the mechanism of Sidwell et al [10] showed a much lower heat release rate for temperatures below 800 K. Compared to the mechanism of Shimizu et al [1], the mechanism of Sidwell appears to underestimate the importance of the oxidative adsorption of methane and the desorption of oxygen, and overestimate the adsorption of oxygen.…”

Section: Dð1=tþmentioning

confidence: 66%

“…This sensitivity is calculated through perturbing the rate coefficient k i by 0.1%. Three dominant reactions are identified, as also identified in [1]: the oxidative adsorption of methane and desorption of oxygen play a positive role, while the adsorption of oxygen has a negative influence. With increasing temperature the importance of the adsorption and desorption of oxygen reduces, while the oxidative adsorption of methane exerts a large impact.…”

Section: Dð1=tþmentioning

confidence: 86%

“…Methane, however, is difficult to ignite, and as such presents a significant handicap for such severely residence-time-limited application as supersonic propulsion. Recently it has been suggested that ignition can be catalytically facilitated by seeding the flow with palladium (Pd) or palladium oxide (PdO) nanoparticles generated in situ from a soluble Pd precursor [1].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, Sidwell and co-workers proposed a 15-reaction surface mechanism to describe their stagnation flow experimental data in the catalyst temperature range of 673-1033 K [10], and deduced a global surface mechanism in the temperature range of 953-1383 K [11]. Furthermore, Shimizu et al [1] experimentally studied the catalytic ignition of methane over in situ generated Pd-based nano-catalyst in a flow tube. A surface mechanism was developed to simulate the experimental data, with good agreement.…”

Section: Introductionmentioning

confidence: 99%

“…Our interest includes the assessment and improvement of the catalytic reaction mechanism compiled in [1], the influence of the surface morphology of the catalytic wire on the extent of the catalytic heat release rate, as well as the cause for the existence of a transition temperature in the global activation energy.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Catalytic oxidation of methane over PdO in wire microcalorimetry

Zhang

Xin

Ren

et al. 2013

Combustion and Flame

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a b s t r a c tA two-dimensional model of a weakly buoyant flow over a horizontal wire with surface reaction was developed, using a literature mechanism, to simulate the heat release rate of the catalytic oxidation of methane (2 vol.% in air) over a Pd wire with a porous 1-2 lm PdO surface layer, acquired by wire microcalorimetry over the temperature range of 600-770 K. The experimental and simulation results demonstrate that the catalytic oxidation is characterized by a low-temperature, reaction-controlled regime in which the internal pore surface is totally accessible to the reactions, and a high-temperature regime in which finite-rate pore diffusion also affects the overall heat release rate. Furthermore, the controlling reactions are identified to be the oxidative adsorption of methane, desorption of oxygen, and adsorption of oxygen, with the former two being facilitating and the last retarding. The reaction mechanism was modified using the response surface methodology and the experimental data in the low-temperature reaction-controlled regime, yielding satisfactory prediction of the global activation energy and identification of the role of oxygen coverage in the transition of the global activation energy.

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Section: Dð1=tþmentioning

confidence: 66%

Section: Dð1=tþmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%