Oxidative coupling of methane over sodium promoted praseodymium oxide

Journal Article · Thu Dec 01 04:00:00 EST 1988 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(88)90045-0· OSTI ID:6843319

Gaffney, A M; Jones, C A; Leonard, J J; Sofranko, J A ^[1]

---

1. ARCO Chemical Company, Newton Square, PA (USA)

Unpromoted and alkali-promoted lanthanide oxides were evaluated in the oxidative coupling of methane to higher hydrocarbons. Methane conversion was carried out catalytically and in a redox mode by cycling methane and air independently over the lanthanide oxides. The sodium-promoted nonstoichiometric oxide, 4% Na on Pr{sub 6}O{sub 11}, was most active and selective, giving in the redox mode 21% methane conversion and 76% C{sub 2}{sup +} selectivity at 800 C and 1.4. WHSV (weight hourly space velocity, g CH{sub 4}/g cat. hr). At comparable conversion catalytic methane conversion had a C{sub 2}{sup +} selectivity of 64%. This selectivity deficit with respect to redox is attributed to an additional destructive route of the methyl radical, namely the reaction with molecular oxygen to yield a methylperoxy intermediate. Process variable studies support a mechanism whereby methane is activated at the metal oxide surface to form a methyl radical and in the gas phase C{sub 2}{sup +} hydrocarbon building occurs.

• OSTI ID: 6843319
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 114:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030300* -- Natural Gas-- Drilling
Production
& Processing
030400 -- Natural Gas-- Products & By-Products
AIR
ALKALI METALS
ALKANES
CATALYSTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELEMENTS
FLUIDS
GASES
HYDROCARBONS
KINETICS
METALS
METHANE
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
PROMOTERS
RARE EARTH COMPOUNDS
REACTION KINETICS
REFORMER PROCESSES
SODIUM
SPECIFICITY
SYNTHESIS