Activation of methane by transition metal-substituted aluminopho

Details Activation of methane by transition metal-substituted aluminopho Activation of methane by transition metal-substituted aluminopho

1990-03-16

1991-11-26

Mc Farlane, Anthony

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

585514, 585527, 585531, 585533, 585700, 585943, 502 5, 502 38, 502514, 502213, 502208, C07C 200, B01J 3734

Patent

active

050684850

ABSTRACT:
Aluminophosphate molecular sieves substituted with cobalt, manganese or iron and having the AlPO.sub.4 -34 or AlPO.sub.4 -5, or related AlPO.sub.4 structure activate methane starting at approximately 350.degree. C. Between 400.degree. and 500.degree. C. and at methane pressures .ltoreq.1 atmosphere the rate of methane conversion increases steadily with typical conversion efficiencies at 500.degree. C. approaching 50% and selectivity to the production of C.sub.2+ hydrocarbons approaching 100%. The activation mechanism is based on reduction of the transition metal(III) form of the molecular sieve to the transition metal(II) form with accompanying oxidative dehydrogenation of the methane. Reoxidation of the - transition metal(II) form to the transition metal(III) form can be done either chemically (e.g., using O.sub.2) or electrochemically.

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Iton et al., "Stabilization of Co(III) in Aluminophosphate Molecular Sieve Frameworks", Zeolites, 1989, vol. 9, Nov.
Nguyen et al., "Evidence For Activation Of Methane By Transition Metal-Substituted Aluminophosphate Molecular Sieves", American Chemical Society, 198th Meeting, Miami Beach, Fla., Sep. 10-15, 1989.

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