Activation of methane by transition metal-substituted aluminophosphate molecular sieves

Patent · Tue Jan 01 00:00:00 EST 1991

OSTI ID:868076

Iton, Lennox E ^[1]; Maroni, Victor A ^[2]

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1. Downers Grove, IL
2. Naperville, IL

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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5068485
• OSTI ID: 868076
• Country of Publication: United States
• Language: English

Related Subjects

activation
methane
transition
metal-substituted
aluminophosphate
molecular
sieves
substituted
cobalt
manganese
iron
alpo
-34
-5
related
structure
activate
starting
approximately
350
degree
400
500
pressures
ltoreq
atmosphere
rate
conversion
increases
steadily
typical
efficiencies
approaching
50
selectivity
production
hydrocarbons
100
mechanism
based
reduction
metal
iii
form
sieve
ii
accompanying
oxidative
dehydrogenation
reoxidation
chemically
electrochemically
molecular sieves
conversion efficiencies
molecular sieve
transition metal
oxidative dehydrogenation
aluminophosphate molecular
/585/502/