C2+ selectivity enhancement in oxidative coupling of methane over microwave-irradiated catalysts

Roussy, G.; Marchal, Eric; Thiebaut, Jean‐Marie; Kiennemann, A.; Maire, G.

doi:10.1016/s0378-3820(96)01070-3

Cited by 33 publications

(25 citation statements)

References 20 publications

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“…1 that the conversion of methane increased with temperature increasing using both microwave and conventional heating methods, whilst the methane conversion was higher under microwave conditions than that obtained using conventional heating at the same measured temperatures. The results obtained by Bond et al [12], Roussy et al [13] and Chen et al [15] from similar work also showed that reactions under microwave heating conditions at lower temperature than that required with conventional heating. Both Bond and Chen suggested that the explanation for their observations was the formation of "hot spots" that had temperatures very much in excess of the bulk catalyst, stimulating the reaction to occur.…”

Section: Reaction Of Methane With Oxygen Under Microwave and Conventimentioning

confidence: 73%

“…Additionally, it has been found that microwave radiation resulted in an increased ratio of ethylene to ethane, which is desirable, and also an increased selectivity of CO at the expense of CO 2 . Roussy et al [13] have also revealed an enhancement in higher hydrocarbons selectivity in oxidative coupling of methane over microwave-irradiated catalysts. Wan et al [14] used pulsed-microwave radiation to study the reaction of methane in the absence of oxygen.…”

Section: Introductionmentioning

confidence: 93%

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Oxidative coupling of methane using microwave dielectric heating

Zhang

Lee

Mingos

et al. 2003

Applied Catalysis A: General

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Microwave heating was applied in the oxidative coupling of methane to higher hydrocarbons over alumina supported La 2 O 3 /CeO 2 catalysts. It was found that microwave heating had a dramatic effect on the reaction when methane was converted into C 2 hydrocarbons in the absence of oxygen, with products produced at measured temperatures about 250 • C lower than those observed with conventional heating. It was shown that the reaction in the absence of oxygen occurred primarily in the gas phase and it was the localised heating of the methane that was responsible for the increased reaction rate. However, it was observed that microwave heating did not produce significant "special microwave effects" which affected the product species formed when the oxidative coupling reaction occurred in the presence of oxygen.

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Section: Reaction Of Methane With Oxygen Under Microwave and Conventimentioning

confidence: 73%

Section: Introductionmentioning

confidence: 93%

Oxidative coupling of methane using microwave dielectric heating

Zhang

Lee

Mingos

et al. 2003

Applied Catalysis A: General

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“…Most of the early work on the application of microwaves in heterogeneous catalysis had been focused on the oxidative coupling of methane, aiming to produce higher hydrocarbons [89][90][91]. A study of the oxidative coupling of methane using both conventional and microwave heating was carried out by Wan et al in the early 1990s [89], initially using pulsed-microwave radiation to study the reaction of methane in the absence of oxygen.…”

Section: Oxidative Coupling Of Methane To Higher Hydrocarbonsmentioning

confidence: 99%

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

Zhang

Hayward

2006

Inorganica Chimica Acta

171

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The application of microwave dielectric heating in a range of environment-related heterogeneous catalytic reaction systems has been reviewed. The reactions investigated include the decomposition of hydrogen sulfide, the reduction of sulfur dioxide with methane, the reformation of methane by carbon dioxide, the hydrodesulfurization of thiophene, and the oxidative coupling of methane. The interaction of microwave irradiation with heterogeneous catalytic systems and its consequence for the microwave heating behaviour of catalysts have been examined. The effect/mechanism of microwave dielectric heating on heterogeneous catalytic reaction systems has also been discussed.

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“…The significant reduction in reaction temperature exceeds all attempts that have been made so far to improve catalyst activity when the conventional heating method is used. In addition, an increased ratio of ethylene to ethane in products, which is desirable, has been observed under microwave heating conditions [13, 15,16]. Roussy et al [15] have revealed an enhancement in higher hydrocarbons selectivity in OCM over microwave irradiated catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, an increased ratio of ethylene to ethane in products, which is desirable, has been observed under microwave heating conditions [13, 15,16]. Roussy et al [15] have revealed an enhancement in higher hydrocarbons selectivity in OCM over microwave irradiated catalysts. Wan et al [16] used pulsedmicrowave radiation to study the reaction of methane in the absence of oxygen.…”

Section: Introductionmentioning

confidence: 99%

Microwave assisted heterogeneous catalysis: effects of varying oxygen concentrations on the oxidative coupling of methane

Binghua

Lee

Sun

et al. 2009

React Kinet Catal Lett

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The oxidative coupling of methane was investigated over alumina supported La 2 O 3 /CeO 2 catalysts under microwave dielectric heating conditions at different oxygen concentrations. It was observed that, at a given temperature using microwave heating, selectivities for both ethane and ethylene were notably higher when oxygen was absent than that in oxygen/methane mixtures. The differences were attributed to the localised heating of microwave radiation resulting in temperature inhomogeneity in the catalyst bed. A simplified model was used to estimate the temperature inhomogeneity; the temperature at the centre of the catalyst bed was 85°C greater than that at the periphery when the catalyst was heated by microwaves in a gas mixture with an oxygen concentration of 12.5% (v/v), and the temperature difference was estimated to be 168°C in the absence of oxygen.

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C2+ selectivity enhancement in oxidative coupling of methane over microwave-irradiated catalysts

Cited by 33 publications

References 20 publications

Oxidative coupling of methane using microwave dielectric heating

Oxidative coupling of methane using microwave dielectric heating

Applications of microwave dielectric heating in environment-related heterogeneous gas-phase catalytic systems

Microwave assisted heterogeneous catalysis: effects of varying oxygen concentrations on the oxidative coupling of methane

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