Durable changes of the catalytic properties of alumina-supported platinum induced by microwave irradiation

Thiebaut, Jean‐Marie; Roussy, G.; Medjram, Mohamed Salah; Garin, F.; Seyfried, Luc; Maire, G.

doi:10.1007/bf00767378

Cited by 35 publications

(12 citation statements)

References 7 publications

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“…A number of supported catalysts have been heated by this method, and considerable enhancement in reaction rates and/or selectivity has been observed. [1][2][3][4][5][6][7][8][9] The reasons for the improved performance are not fully understood, but selective heating of parts of the catalyst, together with other types of temperature variation across the catalyst bed, has been considered as a possible explanation. [8][9][10][11][12][13][14][15] In a recent study of the reaction of sulfur dioxide with methane over MoS 2 /alumina catalysts using microwave heating, 16 we observed the partial conversion of γ-alumina to Ralumina.…”

Section: Introductionmentioning

confidence: 99%

Microwave Dielectric Heating Behavior of Supported MoS₂ and Pt Catalysts

Zhang

Hayward

Mingos

2001

Ind. Eng. Chem. Res.

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The temperature of supported MoS 2 and Pt catalysts was measured during microwave heating at constant input power by inserting a thermocouple into the center of the catalyst bed immediately after the microwave power had been turned off at the end of progressively longer heating times. Thermal runaway was observed with MoS 2 /Al 2 O 3 and Pt/Al 2 O 3 at temperatures in the range 285-300°C when the power absorbed rose with temperature at a rate greater than that at which heat is lost by cooling. This condition was not attained with MoS 2 /SiO 2 , and thermal runaway was not observed. For the MoS 2 catalysts, the fraction of the microwave power absorbed, γ, was found to vary with temperature according to the equation γ ) c A + c M exp(-E a /RT), where c A and c M are constants and the activation energy, E a , is 9.3 kJ mol -1 for MoS 2 /Al 2 O 3 and 11.1 kJ mol -1 for MoS 2 /SiO 2 .

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Section: Introductionmentioning

confidence: 99%

Microwave Dielectric Heating Behavior of Supported MoS₂ and Pt Catalysts

Zhang

Hayward

Mingos

2001

Ind. Eng. Chem. Res.

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“…Durable changes of the catalytic properties of supported platinum induced by microwave irradiation have been also recorded [29]. A drastic reduction of the time of activation (from 9 h to 10 min) was observed in the activation of NaY zeolite catalyst by microwave dehydration in comparison with conventional thermal activation [30].…”

Section: Catalyst Activation and Reactivation (Regeneration)mentioning

confidence: 82%

Microwave Catalysis in Organic Synthesis

Hájek

2002

Microwaves in Organic Synthesis

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It is well known that microwave drying of many solid materials is a very efficient and widely used process even on an industrial scale [3]; it is also an attractive means of drying of heterogeneous catalysts. Microwave drying of catalysts and supported sorbents has several advantages:. reduction of drying time;. higher surface area and catalytic activity;. thermal dispersion of active species facilitated by microwave energy, providing more uniform metal distribution; and . higher mechanical strength of catalyst pellets.Microwave heating has been reported to produce materials with particular physical and chemical properties [4]. Stable solid structures are formed at low reaction

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“…Seyfried et al [63], Thiebaut et al [64], and Roussy et al [65] studied the isomerization reaction of 2-methylpentane over Pt/Al 2 O 3 catalyst under microwave and conventional heating. Higher conversion of reactants was observed when the reaction was carried out in the presence of an electromagnetic field.…”

Section: Methane Decompositionmentioning

confidence: 98%

“…Changed dispersion of metallic particles b) [63][64][65] Methanol steam reforming Higher production rate, higher selectivity…”

Section: Methane Decompositionmentioning

confidence: 99%

Microwaves in Heterogeneous Gas‐Phase Catalysis: Experimental and Numerical Approaches

2009

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This review paper focuses on the effects of microwave irradiation on heterogeneous gas phase catalytic reaction systems. Both experimental and modeling approaches are discussed. The currently available methods for temperature measurements in the microwave heating of solid particles are critically examined. The existence of microwave-created temperature gradients in beds of solid particles is discussed. The not fully established mechanism of catalyst (nano)particle heating and imperfect temperature measurement techniques implicate that different effects are often observed and contradictory conclusions are drawn. For further progress here, the development of accurate and possibly non-invasive techniques for local temperature measurements under microwave irradiation is needed.

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Durable changes of the catalytic properties of alumina-supported platinum induced by microwave irradiation

Cited by 35 publications

References 7 publications

Microwave Dielectric Heating Behavior of Supported MoS₂ and Pt Catalysts

Microwave Dielectric Heating Behavior of Supported MoS₂ and Pt Catalysts

Microwave Catalysis in Organic Synthesis

Microwaves in Heterogeneous Gas‐Phase Catalysis: Experimental and Numerical Approaches

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Durable changes of the catalytic properties of alumina-supported platinum induced by microwave irradiation

Cited by 35 publications

References 7 publications

Microwave Dielectric Heating Behavior of Supported MoS2 and Pt Catalysts

Microwave Dielectric Heating Behavior of Supported MoS2 and Pt Catalysts

Microwave Catalysis in Organic Synthesis

Microwaves in Heterogeneous Gas‐Phase Catalysis: Experimental and Numerical Approaches

Contact Info

Product

Resources

About

Microwave Dielectric Heating Behavior of Supported MoS₂ and Pt Catalysts

Microwave Dielectric Heating Behavior of Supported MoS₂ and Pt Catalysts