Catalytic Combustion of Hydrogen-Air Mixtures Over Platinum: Validation of Hetero/Homogeneous Chemical Reaction Schemes

Appel, Christoph; Mantzaras, Ioannis; Schaeren, Rolf; Bombach, Rolf; Inauen, Andreas

doi:10.1615/interjenercleanenv.v5.i1.20

Cited by 29 publications

(16 citation statements)

References 23 publications

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“…Furthermore, the laminar flow is supposed into the micro-combustor. All the length of the microchannel is coated with Pt catalyst and the catalytic reaction is governed by Schefer equation [10]. The wall and inlet temperatures are assumed to be constant.…”

Section: Assumptionsmentioning

confidence: 99%

“…The validity of various hetero/homogeneous chemical reaction schemes in the catalytic stabilized combustion (CST) of the H 2 /Air mixture over platinum was experimentally and numerically investigated in [10]. Crucial to the development of such systems is the understanding of the heterogeneous (catalytic) and the homogeneous (gas-phase) kinetics.…”

Section: Introductionmentioning

confidence: 99%

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Analytical two-dimensional modeling of hydrogen–air mixture in catalytic micro-combustor

Fanaee

Esfahani

2015

Meccanica

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This paper investigates the combustion phenomenon in catalytic micro-combustor by using a twodimensional model. In solution of energy and mass equations, the temperature and mass dependant reaction rates are considered with an iterative procedure where the series matching conditions are exerted between neighbor zones. The reaction zone thickness is considered as a variable parameter and predicted by the solution results of the present study. The study of main parameters effects such as normalized wall temperature, Peclet number and equivalence ratio is also attained. The limitations of low and high Peclet number are determined where at high Peclet numbers the maximum temperature is decreased and the trend is inversed at low Peclet numbers. In order to validate this model the results are compared with published experimental data, showing an acceptable agreement and confirming the accuracy of the predicted data.

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Section: Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical two-dimensional modeling of hydrogen–air mixture in catalytic micro-combustor

Fanaee

Esfahani

2015

Meccanica

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“…[26]. It would cause a temperature change of FBG device corresponding to hydrogen concentration level.…”

Section: Sensing Principlementioning

confidence: 99%

A Robust Fiber Bragg Grating Hydrogen Gas Sensor Using Platinum-Supported Silica Catalyst Film

et al. 2018

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A robust fiber Bragg grating (FBG) hydrogen gas sensor for reliable multipoint-leakage monitoring has been developed. The sensing mechanism is based on shifts of center wavelength of the reflection spectra due to temperature change caused by catalytic combustion heat. The sensitive film which consists of platinum-supported silica (Pt/SiO 2 ) catalyst film was obtained using sol-gel method. The precursor solution was composed of hexachloroplatinic acid and commercially available silica precursor solution. The atom ratio of Si : Pt was fixed at 13 : 1. A small amount of this solution was dropped on the substrate and dried at room temperature. After that, the film was calcined at 500°C in air. These procedures were repeated and therefore thick hydrogen-sensitive films were obtained. The catalytic film obtained by 20-time coating on quartz glass substrate showed a temperature change 75 K upon exposure to 3 vol.% H 2 . For realizing robust sensor device, this catalytic film was deposited and FBG portion was directly fixed on titanium substrate. The sensor device showed good performances enough to detect hydrogen gas in the concentration range below lower explosion limit at room temperature. The enhancement of the sensitivity was attributed to not only catalytic combustion heat but also related thermal strain.

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“…The heterogeneous combustion is catalytic combustion occurring at lower than the autoignition temperature of the fuel/oxidizer mixture and can significantly reduce NOx due to much lower temperature as compared to homogenous combustion [Pfefferle, L. D. and W. C. Pfefferle, (1987) Maas and Warnatz (1993), Roy et al, 1999, Appel et al, 2004. Catalytic combustion can not take place at a steady state rate greater than reactants mass transfer rate to washcoat or products mass transfer rate away from the washcoat [Pfefferle, L. D. and W. C. Pfefferle, 1987].…”

Section: External Mass Transfer Limitations Of Monolithic Washcoated mentioning

confidence: 99%

Hydrogen Production for Fuel Cells via Reforming Coal-Derived Methanol

Erickson¹

2006

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Hydrogen can be produced from many feedstocks including coal. The objectives of this project are to establish and prove a hydrogen production pathway from coal-derived methanol for fuel cell applications.This progress report is the ninth report submitted to the DOE reporting on the status and progress made during the course of the project. This report covers the time period of October 1, 2005 -December 31, 2005 This quarter saw progress in four areas. These areas are:1. reformate purification, 2. heat transfer enhancement, 3. autothermal reforming coal-derived methanol degradation test 4. and model development for fuel cell system integration.The project is on schedule and is now shifting towards the design of an integrated PEM fuel cell system capable of using the coal-derived product. This system includes a membrane clean up unit and a commercially available PEM fuel cell. 3 TABLE OF CONTENTSDISCLAIMER EXECUTIVE SUMMARYHydrogen can be produced from many feedstocks including coal. The objectives of this project are to establish and prove a hydrogen production pathway from coal-derived methanol for fuel cell applications.This progress report is the ninth report submitted to the DOE reporting on the status and progress made during the course of the project. This report covers the time period of October 1, 2005 -December 31, 2005.Much progress has been made on the project funded by the Department of Energy during this reporting period. All of the projects are proceeding on schedule. This quarter saw progress in four main areas. These areas are:1. reformate purification, 2. heat transfer enhancement, 3. autothermal reforming coal-derived methanol degradation test 4. and model development for fuel cell system integration.Progress has been made on the reformate purification system. The purified hydrogen stream will be used to fuel a PEM fuel cell. The Hydrogen Production and Utilization Lab will be using a Ballard Nexa® stack from the Hybrid Vehicle Propulsion Systems Laboratory at UC Davis. The fuel cell will demonstrate a hydrogen production pathway from coal-derived methanol for fuel cell applications.While the main thrust of the work is progressing toward the demonstration of the fuel cell operating from coal derived methanol as outlined in the original proposal, further work on previous topics has expanded as well. Previous quarter's results show that using different dimension disk-ring bluff body resulted in different steam reforming enhancement. Also a swirl tape passive flow disturber was tested and showed no significant difference compared to the base line, or the results without any flow disturbers. In a recent experiment, different bluff body geometries were tested to determine the effect in bluff body enhancement. Also, smaller dimension catalyst powder was also tested and compared with the crushed catalyst in another experiment set.Further research is planned to analyze the bluff body geometry and catalyst dimension's flow influence in the packed bed such as the pressure drop and determine if th...

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Catalytic Combustion of Hydrogen-Air Mixtures Over Platinum: Validation of Hetero/Homogeneous Chemical Reaction Schemes

Cited by 29 publications

References 23 publications

Analytical two-dimensional modeling of hydrogen–air mixture in catalytic micro-combustor

Analytical two-dimensional modeling of hydrogen–air mixture in catalytic micro-combustor

A Robust Fiber Bragg Grating Hydrogen Gas Sensor Using Platinum-Supported Silica Catalyst Film

Hydrogen Production for Fuel Cells via Reforming Coal-Derived Methanol

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