Oxidative dimerization of methane over a lithium-promoted magnesium oxide catalyst

Ito, Tairo; Wang, Jixiang; Lin, Chih‐Yuan; Lunsford, Jack H.

doi:10.1021/ja00304a008

Cited by 842 publications

(347 citation statements)

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“…The missing electrons are introduced via charge transfer from the MgO/ Ag interface into the Au island. This charging effect is corroborated by a DFT Bader analysis, yielding a value of -3.54|e| for the Au 18 cluster, but matches also the average transfer of -0.2|e| per atom as calculated for dense-packed Au layers on thin MgO films [56]. Similar procedures have been carried out for many other Au aggregates on the MgO-Ag(001) system [56].…”

Section: Example #2: Nanoparticles and The Metal Oxide Interfacesupporting

confidence: 79%

“…The experimental signature shown in Fig. 7 could be matched with the properties of a planar Au 18 cluster. Its structure is derived from a magic-size Au 19 cluster with one missing corner atom.…”

Section: Example #2: Nanoparticles and The Metal Oxide Interfacementioning

confidence: 55%

“…O Á2 formally replaces Mg 2? O 2- [17], and the reaction is initiated by hydrogen abstraction from methane at the oxygen radical sites [18],…”

Section: Introductionmentioning

confidence: 99%

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Models in Catalysis

2014

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The paper discusses the hierarchy of model studies with increasing complexity towards an understanding of industrial catalysts under reaction conditions. We use three case studies to document the progress in systems complexity as well as the development of instruments that allow us to approach the study of acting catalysts: magnesium oxide clusters in the gas phase, gold nanoparticles on metal oxide surfaces, and palladium nanoparticles compared to crystal surfaces. While the examples are from the field of heterogeneous catalysis, we discuss the relation to homogeneous and enzymatic catalysis.

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Section: Example #2: Nanoparticles and The Metal Oxide Interfacesupporting

confidence: 79%

Section: Example #2: Nanoparticles and The Metal Oxide Interfacementioning

confidence: 55%

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Models in Catalysis

2014

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“…Here only some typical features of this model, developed for a Sn/Li/MgO catalyst (Korf et al, 1989), will be given. The most important catalytic reaction during the oxidative coupling of methane is the production of methyl radicals (Ito et al, 1985;Aparicio et al, 1991;Reyes et al, 1993a;McCarty, 1992;Krylov, 1993) through the following catalytic cycle:…”

Section: Typical Features Of the Heterogeneously Catalyzed Oxidative mentioning

confidence: 99%

Irreducible Mass-Transport Limitations during a Heterogeneously Catalyzed Gas-Phase Chain Reaction: Oxidative Coupling of Methane

Couwenberg

Chen

Marin

1996

Ind. Eng. Chem. Res.

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A heterogeneous reactor model was developed describing kinetic experiments on the heterogeneously catalyzed oxidative coupling of methane in a laboratory fixed-bed reactor. The catalyst produces radicals which react further through gas-phase reactions in the pores of the catalyst and in the interstitial phase. The reactor model accounts for the irreducible mass-transport limitations for the reactive radicals, which occur even at conditions where no mass-transport limitations occur for the molecules, both reactants and reaction products. The effects of these irreducible mass-transport limitations on the conversion and selectivity of the process were investigated and were found to be essential for an adequate description of experimental data.

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“…Direct methane conversion using pyrolysis, resulting in acetylene and benzene, can only operate at temperatures above 1200 K [6]. Oxidative coupling of methane to ethylene has been proposed as a promising alternative route [7][8][9][10][11][12] and proceeds at temperatures between 850 and 1200 K.…”

Section: Introductionmentioning

confidence: 99%