Activation of methane by transition metal-substituted aluminophosphate molecular sieves

Patent Application · Fri Mar 16 00:00:00 EST 1990

OSTI ID:5856668

Iton, L E; Maroni, V A

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 and 500{degree}C and at methane pressures {le} 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 cobalt substituted AlPO{sub 4}-34 structure (CoAPSO-34) produces ethylene, ethane, propylene, and propane in varying proportions, depending on reaction conditions. The cobalt-substituted AlPO{sub 4}-5 (CoAPSO-5) produces polypropylene in very high yield, with ethane, ethylene, and propane also produced. The activation mechanism is based on reduction of the transition metal (III) from 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. 4 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-31109-ENG-38
• Assignee: Dept. of Energy
• Patent Number(s): PATENTS-US-A7494380
• Application Number: ON: DE91011640; PPN: US 7-494380
• OSTI ID: 5856668
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
ALUMINIUM PHOSPHATES
CATALYTIC EFFECTS
COBALT
IRON
MANGANESE
METHANE
CHEMICAL ACTIVATION
CHEMICAL FEEDSTOCKS
CHEMICAL REACTION YIELD
COAL GAS
COMPARATIVE EVALUATIONS
DEHYDROGENATION
ETHANE
ETHYLENE
GAS CHROMATOGRAPHY
LIQUID FUELS
MOLECULAR SIEVES
NATURAL GAS
OXIDATION
PROMOTERS
PROPANE
PROPYLENE
REGENERATION
SYNTHESIS
TEMPERATURE DEPENDENCE
ADSORBENTS
ALKANES
ALKENES
ALUMINIUM COMPOUNDS
CHEMICAL REACTIONS
CHROMATOGRAPHY
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDROCARBONS
METALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
SEPARATION PROCESSES
TRANSITION ELEMENTS
YIELDS
030300* - Natural Gas- Drilling
Production
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