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The oxidative coupling of methane over alkali, alkaline earth, and rare earth oxides

Journal Article · · Ind. Eng. Chem. Res.; (United States)
DOI:https://doi.org/10.1021/ie00081a004· OSTI ID:6054488
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Unpromoted and promoted oxides of the alkali, alkaline earth, and rare earth metals have been tested as catalysts for the oxidative coupling of methane under a standard set of reaction conditions. The conditions were 700-900/sup 0/C, 1 atm of pressure, 60 cm/sup 3//min of CH/sub 4/, 10 cm/sup 3//min of O/sub 2/, 130 cm/sup 3//min of Ar, and a gas hourly space velocity of 37500 h/sup -1/ (NTP). Selective catalyst are solid bases exhibiting one stable oxidation state, e.g., the oxides of Li, Mg, Ca, Sr, Sc, Y, La, Nd, Sm, Eu, and Gd. Nonselective catalysts exhibit more than one stable oxidation state, e.g., the oxides of Ce, Pr, and Mn. The highest yield of higher hydrocarbon products is obtained over rare earth oxides, particularly those promoted with alkaline earth metals. AT 750/sup 0/C, 0.3 atm of CH/sub 4/, 0.05 atm of O/sub 2/, and 0.65 atm of Ar, 1 wt % of Sr/La/sub 2/O/sub 3/ converted 1.2 mol g/sup -1/ h/sup -1/ of CH/sub 4/ with 77% selectivity to higher hydrocarbons.
Research Organization:
Research Div., W. R. Grace and Co., Columbia, MD (US); Dept. of Chemical Engineering, UCLA, Los Angeles, CA (US)
OSTI ID:
6054488
Journal Information:
Ind. Eng. Chem. Res.; (United States), Journal Name: Ind. Eng. Chem. Res.; (United States) Vol. 27:9; ISSN IECRE
Country of Publication:
United States
Language:
English

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Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ALKALI METALS
ALKALINE EARTH METALS
ALKANES
CALCIUM
CATALYSTS
CATALYTIC CONVERTERS
CATALYTIC EFFECTS
CERIUM
CHEMICAL REACTIONS
COUPLING
ELEMENTS
EQUIPMENT
EUROPIUM
GADOLINIUM
HYDROCARBONS
LANTHANUM
LITHIUM
MAGNESIUM
MANGANESE
METALS
METHANE
NEODYMIUM
ORGANIC COMPOUNDS
OXIDATION
POLLUTION CONTROL EQUIPMENT
PROMETHIUM
RARE EARTHS
SAMARIUM
STRONTIUM
TRANSITION ELEMENTS
YTTRIUM