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Methane, combustion

In contrast to the lean propane flame, the burning intensity of the lean limit methane flame increases for the leading point. Preferential diffusion supplies the tip of this flame with an additional amoxmt of the deficient methane. Combustion of leaner mixture leads to some extension of the flammability limits. This is accompanied by reduced laminar burning velocity, increased flame surface area (compare surface of limit methane... [Pg.20]

Robson, K. and Wilson, M.J.G., The stability of laminar diffusion flames of methane. Combust. Flame, 13, 626, 1969. [Pg.177]

Fig.l Surface area and catalytic activity for methane combustion of AMnAlii-Oi9methane conversion level is 10%. Reaction condition CH4,1 vol% air, 99 vol% space velocity, 48 OOOh ... [Pg.419]

The measurement of catalytic activity of PdPt bimetallic nanoparticles over methane combustion showed that the difference in activity with increasing and decreasing reaction temperatures disappeared probably due to the synergestic effect of the formation of the PdPt bimetallic nanoparticles [176]. [Pg.68]

Burch, R. and Urbano, F.J. (1995) Methane combustion over palladium catalysts The effect of carbon dioxide and water on the activity, Appl. Catal. A 123, 173. [Pg.324]

Ifrah, S., Kaddouri, A., Gelin, P. and Leonard, D. (2007) Conventional hydrothermal process versus microwave-assisted hydrothermal synthesis of La3 xAgxMn03 + s (x = 0, 0.2) perovskites used in methane combustion. Comptes Rendus Chimie, 10, 1216-1226. [Pg.236]

Pt/H-MCM-22 catalysts for methane combustion have been prepared by ion-exchange of a highly crystalline H-MCM-22 zeolite using [Pt(NH3)4](N03)2. The activation procedure of the catalyst precursor has been optimized and all steps monitored by HRTEM, SEM and FTIR of CO adsorbed. The preliminary decomposition/calcination of the ion exchanged sample is very crucial in that influence the final properties of platinum active species. [Pg.85]

The results of the catalytic activity for methane combustion are summarised in Table 1 and fig. 1. The methane conversions of the Pd2HZSHe catalyst are higher than those of the Pd2HZIHe sample. In fact, the ignition temperatures T10% (temperature necessary to have 10% of methane conversion) are respectively 355 and 371°C. This result suggests that the catalyst prepared by solid-exchange method is more active than that prepared by impregnation. [Pg.410]

Figure 2.19 provides the thermodynamic equilibrium data for methane decomposition reaction. At temperatures above 800°C, molar fractions of hydrogen and carbon products approach their maximum equilibrium value. The effect of pressure on the molar fraction of H2 at different temperatures is shown in Figure 2.20. It is evident that the H2 production yield is favored by low pressure. The energy requirement per mole of hydrogen produced (37.8 kj/mol H2) is significantly less than that for the SMR reaction (68.7 kj/mol H2). Owing to a relatively low endothermicity of the process, <10% of the heat of methane combustion is needed to drive the process. In addition to hydrogen as a major product, the process produces a very important by-product clean carbon. Because no CO is formed in the reaction, there is no need for the WGS reaction and energy-intensive gas separation stages. Figure 2.19 provides the thermodynamic equilibrium data for methane decomposition reaction. At temperatures above 800°C, molar fractions of hydrogen and carbon products approach their maximum equilibrium value. The effect of pressure on the molar fraction of H2 at different temperatures is shown in Figure 2.20. It is evident that the H2 production yield is favored by low pressure. The energy requirement per mole of hydrogen produced (37.8 kj/mol H2) is significantly less than that for the SMR reaction (68.7 kj/mol H2). Owing to a relatively low endothermicity of the process, <10% of the heat of methane combustion is needed to drive the process. In addition to hydrogen as a major product, the process produces a very important by-product clean carbon. Because no CO is formed in the reaction, there is no need for the WGS reaction and energy-intensive gas separation stages.
Electrim Tech ESM 779 Semi- conductor Methane (combustible gases) 10-25% UEG 12 V/24V/ 230 V 2-3 W... [Pg.162]

Figaro TGS 842 Semi- conductor (Sn02) Methane (combustible gases) 500-10000 ppm 0.9 W... [Pg.162]

GMI Gas-Test 3 Pellistor Methane (combustible gases) 0-100% LEL 4 Monobatteries 15 h... [Pg.162]

Figure 6-5 Maximum pressure for methane combustion in a 20-L sphere. The flammability limits are defined at 1 psig maximum pressure. Data from C. V. Mashuga and D. A. Crowl, Process Safety Progress (1998), 17(3) 176-183 and J. M. Kuchta, Investigation of Fire and Explosion Accidents in the Chemical, Mining, and Fuel-Related Industries A Manual, US Bureau of Mines Report 680 (Washington, DC US Bureau of Mines, 1985). Figure 6-5 Maximum pressure for methane combustion in a 20-L sphere. The flammability limits are defined at 1 psig maximum pressure. Data from C. V. Mashuga and D. A. Crowl, Process Safety Progress (1998), 17(3) 176-183 and J. M. Kuchta, Investigation of Fire and Explosion Accidents in the Chemical, Mining, and Fuel-Related Industries A Manual, US Bureau of Mines Report 680 (Washington, DC US Bureau of Mines, 1985).
Masri, A. R. and S. B. Pope (1990). PDF calculations of piloted turbulent nonpremixed flames of methane. Combustion and Flame 81, 13-29. [Pg.418]

Y.-E. Han, L. Chen, K. Ramesh, E. Widjaja, S. ChUukoti, l.K. Suijami and J. Chen, Kinetic and spectroscopic smdy of methane combustion over a-Mn203 nanocrystal catalysts, J. Catal., 253, 261-268 (2008). [Pg.234]

Baiker, A Marti, PE Keusch, P Fritsch, E Reller, A. Influence of the A-site cation in AC0O3 (A = La, Pr, Nd, and Gd) perovskite-type oxides on catalytic activity for methane combustion. J. Catal, 1994, Volume 146, Issue 1, 268-276. [Pg.72]

Ciambelli, P Cimino, S Lisi, L Faticanti, M Minelli, G Pettiti, 1 Porta, P. La, Ca and Fe oxide perovskites preparation, characterization and catalytic properties for methane combustion. Appl Catal, B Environmental, 2001, Volume 33, Issue 3, 193-203. [Pg.72]

Alifanti, M Auer, R Kirchnerova, J Thyrion, F Grange, P Delmon, B. Activity in methane combustion and sensitivity to sulfur poisoning of LauxCexMni.yCoyOs perovskite oxides. Appl. Catal, B Environmental, 2003, Volmne 41, Issues 1-2, 71-81. [Pg.75]

Fig. 1 High-temperature methane combustion. Adapted from Reference 7. Fig. 1 High-temperature methane combustion. Adapted from Reference 7.
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Kinetics of Methane Combustion

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Methane Combustion and Methods for Sample Preparation

Methane Combustion on Perovskites

Methane combustion constants

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Methane combustion with oxides

Methane combustion with oxygen

Methane combustion, illustration

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