Oxidative coupling of methane for the production of ethylene over sodium-tungsten-manganese-supported-silica catalyst (Na-W-Mn/SiO2)

Chua, Yen Thien; Mohamed, Abdul Rahman; Bhatia, Subhash

doi:10.1016/j.apcata.2008.03.032

Cited by 72 publications

(56 citation statements)

References 7 publications

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“…In the OCM process, methane and oxygen are generally fed over a metal or metal oxide catalyst at moderate temperatures (500-800°C) to produce mainly ethane and ethylene. The majority of the previous studies on OCM have been focused on the development of catalysts ranging from metals to rare-earth metal oxides, and this still dominates the current relevant work [1][2][3][4][5]. The overall process has been found to be endothermic and energy intensive although the OCM reaction itself is highly exothermic when two methyl radicals are coupled after the abstraction of one hydrogen atom from the methane molecule [2].…”

Section: Introductionmentioning

confidence: 99%

“…The conversion of methane, which is the major constituent of natural gas, into value-added chemicals has increasingly received attention in recent years [1][2][3][4][5][6][7][8][9]. Among the processes studied, oxidative coupling of methane (OCM) has shown a promising alternative route to convert methane directly into higher hydrocarbons [1][2][3][4][5][6][7], while extensive studies has been focused on converting methane into synthesis gas [8,9], which can then be converted to higher hydrocarbons through the Fischer-Tropsch chemistry [9].…”

Section: Introductionmentioning

confidence: 99%

“…Among the processes studied, oxidative coupling of methane (OCM) has shown a promising alternative route to convert methane directly into higher hydrocarbons [1][2][3][4][5][6][7], while extensive studies has been focused on converting methane into synthesis gas [8,9], which can then be converted to higher hydrocarbons through the Fischer-Tropsch chemistry [9]. In the OCM process, methane and oxygen are generally fed over a metal or metal oxide catalyst at moderate temperatures (500-800°C) to produce mainly ethane and ethylene.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Among several catalysts, 5wt%Na2WO4-2wt%Mn/SiO2 offers a good performance in OCM with 20% of methane conversion and 80% of C2 + selectivity [3,[5][6][7]]. Lunsford and co-workers [8][9] reported that Na-O-Mn species were responsible for an activation of methane, in which Mn was an active component, Na provided selectivity, and W was required to stabilize the catalyst.Afterwards, Lapeña-Rey et al investigated OCM in SOFC using YSZ as a solid electrolyte, 5wt%Na2WO4-2wt%Mn/SiO2 was used as an anode catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…A wide variety of catalysts have been studied. However, the yield of C2 hydrocarbons achieved in a fixed-bed reactor (FBR) was limited to about 25% due to the presence of undesired partial or complete oxidation in gas phase and on catalyst surface [2][3][4]. To overcome this limiting problem, selective catalysts for the methane coupling reaction and some reactors have been designed to inhibit the side reactions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Na2WO4-Mn Supported YSZ as a Potential Anode Catalyst for Oxidative Coupling of Methane in SOFC Reactor

Appamana

Charojrochkul

Assabumrungrat

et al. 2015

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Abstract. The oxidative coupling of methane (OCM) over a 5%Na2WO4-2%Mn on YSZ, has been investigated in a fixed bed reactor (FBR) and a solid oxide fuel cell reactor (SOFC). A 60% C2 selectivity and a 26% CH4 conversion have been obtained in a FBR at 800 o C and CH4/O2 of 4:1. Importantly, an addition of Na2WO4-Mn to YSZ support can significantly enhance the performance of the catalyst especially C2 hydrocarbons selectivity and CH4 conversion. A maximum power density of 7.8 mW cm −2 was achieved at 800°C with CH4 in the SOFC reactor having a 50 μm thick YSZ electrolyte. The CH4 conversion and C2 selectivity at 800°C were 1.1% and 85.2%, respectively.

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Catalytic Membrane Reactors

Soltani¹,

Sahimi²,

Tsotsis³

2013

Encyclopedia of Membrane Science and Technology

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Membrane reactors combining reaction and membrane separation provide numerous advantages over conventional reactors, including retaining expensive catalysts, in situ purification, enhancing reaction rate, and reducing postprocessing of the reaction (by) products. In this article, two different ways were used to classify the various types of membrane reactors. One is based on whether the membrane is catalytic or noncatalytic, selective or nonselective, and whether or not a packed bed or a fluidized bed of catalysts is being used. The second classification is based on the membrane role: the extractor‐type, the distributor‐type, and the contactor‐type membrane reactors. This article presents the key features of these three types of reactors and the various classes of reactions these reactors have been applied, with emphasis on conventional (i.e., nonbiochemical) reaction systems.

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Oxidative coupling of methane for the production of ethylene over sodium-tungsten-manganese-supported-silica catalyst (Na-W-Mn/SiO2)

Cited by 72 publications

References 7 publications

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

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

Synthesis of Na2WO4-Mn Supported YSZ as a Potential Anode Catalyst for Oxidative Coupling of Methane in SOFC Reactor

Catalytic Membrane Reactors

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