Kinetics of catalytic oxidation of methane: Application of initial rate technique for mechanism determination

Ahuja, O. P.; Mathur, G. P.

doi:10.1002/cjce.5450450608

Cited by 17 publications

(4 citation statements)

References 9 publications

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“…The partial pressures of the reactants have a crucial impact [35][36][37]. The inhibiting effect of carbon dioxide becomes more visible, when partial pressure of methane is comparably low.…”

Section: Influence Of Carbon Dioxidementioning

confidence: 98%

Removal of oxygen from (bio-)methane via catalytic oxidation of CH 4 —Reaction kinetics for very low O 2 :CH 4 ratios

Ortloff

Bohnau

Graf

et al. 2016

Applied Catalysis B: Environmental

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Section: Influence Of Carbon Dioxidementioning

confidence: 98%

Removal of oxygen from (bio-)methane via catalytic oxidation of CH 4 —Reaction kinetics for very low O 2 :CH 4 ratios

Ortloff

Bohnau

Graf

et al. 2016

Applied Catalysis B: Environmental

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“…The oxidation of methane over supported Pd catalysts has been widely investigated. The study of support effects (Cullis et al, 1972; Cullis and Willat, 1983), catalyst deactivation mechanism (Cullis and Nevell, 1976), reaction mechanism (Mezaki and Watson, 1966; Seimanides and Stoukides, 1986; Cullis et al, 1971; Ahuja and Mathur, 1967), kinetics (Cullis et aL, 1971), and structure sensitivity effects (Hicks et al, 1990a,b) has attracted attention. It has been shown that the order of the reaction with respect to oxygen and methane is 0 and 0.5, respectively (Cullis et al, 1971).…”

Section: Introductionmentioning

confidence: 99%

Removal of methane from compressed natural gas fueled vehicle exhaust

Subramanian¹,

Kudla²,

Chattha³

1992

Ind. Eng. Chem. Res.

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The objective of this study is to investigate the modes of methane (CH$ removal from simulated compressed natural gas (CNG) fueled vehicle exhaust under net oxidizing, net reducing, and stoichiometric conditions. Model reaction studies were conducted. The results suggest that the oxidation of methane with oxygen contributes to the removal of methane under net oxidizing conditions. In contrast, the oxidation of methane with oxygen as well as nitric oxide contributes to ita removal under net reducing conditions. The steam reforming reaction does not eignificantly contribute to the removal of methane. The methane conversions under net reducing conditiona are higher than those observed under net oxidizing conditions. The study shows that the presence of carbon monoxide in the feed gas lea& to a gradual decrease in the methane conversion with increasing redox ratio, under net oxidizing conditions. A minimum in methane conversion is observed at a redox ratio of 0.8. The higher activity for the methane-oxygen reaction resulting from a lowering in the overall oxidation state of palladium and the contribution of the methane-nitric oxide reaction toward the removal of CH4 appear to account for the higher CHI conversions observed under net reducing conditions. IntroductionNatural gas is an attractive source of fuel for vehicles. The advantagea provided by natural gas include lower fuel cost, longer engine life, lower maintenance, and reduced oil consumption. Methane (CHJ is the major constituent of natural gas. The development of catalysts for oxidizing the unburnt methane in the exhaust stream of natural gas fueled vehiclea is of importance. Several inveatigators have reported studies on noble metal and base metal catalysts

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“…A simple irreversible catalytic reaction, A->B, whose kinetics is expressed by the following form rA =kKpA0XA/(l +KpA0XAf (1) is assumed to take place in a fluidized bed reactor.…”

Section: Discussionmentioning

confidence: 99%

Concentration Stability of Fluidized Bed Reactor

Izawa

Inoue

1975

J. Chem. Eng. Japan

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It is shown that when a set of simultaneous ordinary differential equations represents the mass balances in a fluidized bed reactor as a boundary value problem and the reaction rate has the maximum with respect to the concentration of the reactant, there are cases in which more than one set of solutions for them exist.Investigations are made into the behavior of solutions with changes of a few operating parameters and into the concentration stability in an isothermal condition.These results make it clear that the conditions under which the mass balance equations of a fluidized bed reactor have plural solutions are estimated from the character of the corresponding backmix reactor, and that bubble diameter and height of fluidization have large effects on the concentration stability of the reactor.

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Kinetics of catalytic oxidation of methane: Application of initial rate technique for mechanism determination

Cited by 17 publications

References 9 publications

Removal of oxygen from (bio-)methane via catalytic oxidation of CH 4 —Reaction kinetics for very low O 2 :CH 4 ratios

Removal of oxygen from (bio-)methane via catalytic oxidation of CH 4 —Reaction kinetics for very low O 2 :CH 4 ratios

Removal of methane from compressed natural gas fueled vehicle exhaust

Concentration Stability of Fluidized Bed Reactor

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