Catalytic combustion of hydrogen—II. An experimental investigation of fundamental conditions for burner design

Haruta, Masatake; Souma, Yoshie; Sano, Hiroshi

doi:10.1016/0360-3199(82)90022-2

Cited by 47 publications

(27 citation statements)

References 2 publications

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“…Regarding catalysts, the report by Haruta and Sano is the most complete in terms of catalyst screening and comparison [18]. Pt is a very well established catalyst and is one of the most active for CHC, capable of burning hydrogen through reaction (1) even at room temperature [4,5,7,9,11,12,15,16,18]. Thinking of a practical application for reaction (1), catalyst should be prepared in supported form, which improves dispersion, prevents aggregation and facilitates it use in successive cycles.…”

Section: Introductionmentioning

confidence: 99%

“…Over the conventional hydrocarbon-based fuels employed for heating, hydrogen is advantageous because presents catalytic ignition at lower temperatures, the feasibility to adopt inexpensive oxide catalysts, and no generation of carbon-based residues [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…For the implementation of the "hydrogen economy" challenges related to production, transportation, storage and combustion should be met first. Catalytic hydrogen combustion (CHC, reaction (1)) is a key reaction in the "hydrogen economy" which can be employed as a means of heat production (cookers, heaters, etc) as well as for safety purposes [4][5][6][7][8][9][10][11][12][13][14][15][16][17]:…”

Section: Introductionmentioning

confidence: 99%

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Investigation of a Pt containing washcoat on SiC foam for hydrogen combustion applications

Fernández

Arzac

Vogt

et al. 2016

Applied Catalysis B: Environmental

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Highlights• Catalytic hydrogen combustion was studied in a Pt washcoat on SiC foam• The catalyst contains Pt particles of 5-20 nm size on porous Al 2 O 3 with ceria additive • Kinetics was monitored by measuring water concentration through FTIR • The Pt/SiC material shows high thermal stability and reaction start-up at room temperature • Catalyst converted at least 18.5 L H2 .min -1 .g Pt -1 with 35kJ.mol -1 activation energy Abstract A commercial Pt based washcoat, used for catalytic methane combustion, was studied supported on a commercial SiC foam as catalytic material (Pt/SiC) for catalytic hydrogen combustion (CHC). Structural and chemical characterization was performed using Electron Microscopy, X-Ray Diffraction (XRD) and X-Ray Photoelectron Spectroscopy (XPS). The reaction was monitored following water concentration by Fourier Transform Infrared spectra (FTIR). The FTIR method was compared with H2 detection by Gas Cromatography (GC) and has shown to be adequate to study the kinetics of the CHC reaction in steady state under our experimental conditions (very lean 1% (v/v) H2/air mixtures). The catalyst is composed of 5-20 nm disperse Pt nanoparticles decorating a mixture of high surface area Al2O3 and small amounts of ceria supported on the SiC foam which also contains alumina as binder. The Pt/SiC catalytic material has demonstrated to be active enough to start up the reaction in a few seconds at room temperature. The material has been able to convert at least 18.5Lhydrogen.min -1 .gPt -1 at room temperature in conditions of excess of catalyst. The Pt/SiC material was studied after use using XPS and no significant changes on Pt oxidation states were found. The material was characterized from a kinetic point of view. From the conversion-temperature plot a T50 (temperature for 50% conversion) of 34 o C was obtained. Activation energy measured in our conditions was 35±1 kJ.mol -1 .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of a Pt containing washcoat on SiC foam for hydrogen combustion applications

Fernández

Arzac

Vogt

et al. 2016

Applied Catalysis B: Environmental

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“…The catalytic hydrogen combustion (CHC, reaction (1)) is a key reaction in the "hydrogen economy" which can be employed as a means of heat production (cookers, heaters etc) as well as for safety purposes (elimination of undesired hydrogen). [4][5][6][7][8][9][10][11][12][13][14][15][16][17] For heat production applications, high amounts of hydrogen rich mixtures are preferred. Regarding safety purposes, the amount of undesired hydrogen to be eliminated can range from large amounts in the nuclear industry (in case of an accident) to the byproducts of chemical and petrochemical industries or during the operation of various electrochemical processes.…”

Section: Introductionmentioning

confidence: 99%

Pt-impregnated catalysts on powdery SiC and other commercial supports for the combustion of hydrogen under oxidant conditions

Arzac

Montes

Fernández

2017

Applied Catalysis B: Environmental

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We report the study of the catalytic hydrogen combustion over Pt-impregnated powdery silicon carbide (SiC) using H 2 PtCl 6 as precursor. The reaction was conducted in excess of oxygen. -SiC was selected for the study because of its thermal conductivity, mechanical properties, chemical inertness and surface area. The obtained Pt particles over SiC were medium size (average particle diameter of 5 nm for 0.5wt% Pt). The activity of the Pt-impregnated catalyst over SiC was compared to those obtained in oxidized form over TiO 2 and Al 2 O 3 commercial supports (Pt particles very small in size, average particle diameter of 1 nm for 0.5wt% Pt in both cases). The case of a SiO 2 support was also discussed. Those Pt/SiC particles were the most active because of their higher contribution of surface Pt 0 , indicating that partially oxidized surfaces have better activity than those totally oxidized in these conditions. SiC was modified with an acid treatment and thus bigger (average particle diameter of 7 nm for 0.5wt% Pt) and more active Pt particles were obtained. Durability of the SiC and TiO 2 supported catalysts was tested upon 5 cycles and both have shown to be durable and even more active than initially. Exposure to the oxidative reaction mixture activates the *Revised Manuscript Click here to view linked References catalysts and the effect is more pronounced for the completely oxidized particles. This is due to the surface oxygen chemisorption which activates catalysts´ surface.

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“…For the competition between surface and gas chemistries at the vicinity of the catalytic surface, Deutschmann et al [24] demonstrated that two competitions (fuel and oxidizer) were driven by sticking probability of species on the surface. Nevertheless, the catalytic reaction can significantly enhance the combustion efficiency in a catalytic micro-combustor according to Haruta et al [25].…”

Section: Introductionmentioning

confidence: 99%

Interaction between heterogeneous and homogeneous reaction of premixed hydrogen–air mixture in a planar catalytic micro-combustor

Pan

Yang

et al. 2017

International Journal of Hydrogen Energy

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Hetero-/homogeneous combustion of hydrogen-air mixture in a platinum-coated micro channel was studied by means of three-dimensional (3D) Computational Fluid Dynamics (CFD) model using detailed reaction mechanisms for homogeneous (gas phase) and heterogeneous (catalytic) reactions.The influence of heterogeneous reaction on homogeneous reaction was obtained by discussing the hetero-/homogeneous reaction characteristics, the process and competitiveness of heterogeneous reaction. Intense depletion of fuel and product formation near the inlet has shown that fuel absorption reaction was predominant whiles there was no homogeneous reaction. The free radicals from homogeneous reaction near the catalytic surface were drained, resulting in the interruption of chain reaction. The desorbed product as the third-body promoted the chain terminating reaction to deactivate free radical. The competitiveness value of heterogeneous reaction for capturing fuel was 14.85%, indicating a weak reaction intensity in the catalytic combustor. The heterogeneous reaction presented an inhibition effect on homogeneous reaction but greatly enhanced the combustion efficiency in the micro channel.

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Catalytic combustion of hydrogen—II. An experimental investigation of fundamental conditions for burner design

Cited by 47 publications

References 2 publications

Investigation of a Pt containing washcoat on SiC foam for hydrogen combustion applications

Investigation of a Pt containing washcoat on SiC foam for hydrogen combustion applications

Pt-impregnated catalysts on powdery SiC and other commercial supports for the combustion of hydrogen under oxidant conditions

Interaction between heterogeneous and homogeneous reaction of premixed hydrogen–air mixture in a planar catalytic micro-combustor

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