Accession Number : ADA258801
Title : Mechanism-Imposed Limitations on the Yield of Higher Hydrocarbons from the Oxidative Coupling of Methane, and Alternate Approaches to Methane Conversion
Descriptive Note : Technical rept.
Corporate Author : CALIFORNIA INST OF TECH PASADENA DIV OF CHEMISTRY AND CHEMICAL ENGINEERING
Personal Author(s) : Labinger, J A
Report Date : Apr 1991
Pagination or Media Count : 12
Abstract : The conversion of methane to higher hydrocarbons via oxidative coupling over metal oxide catalysts is the subject of intense study as a route for natural gas upgrading. Detailed study on the reaction of methane over a mixed manganese-magnesium oxide implicates a mechanism involving generation of methyl radicals at the surface, followed by radical coupling as well as other radical reactions in the gas phase as the predominant mode of carbon-carbon bond formation. Analysis of the consequences of this mechanisms suggests that there is an inherent limit on yield, including a major adverse pressure effect, that may severely impact the potential utility of this route. Among several possible approaches to circumventing this limitation, a novel class of catalyst - transition metal-exchanged P -alumina -- has been found to be highly active for complete oxidation of methane. Results of catalytic and characterization studies will be presented.
Descriptors : *CONVERSION , *METHANE , *NATURAL GAS , *SYNTHETIC FUELS , METALS , TRANSITION METALS , METHYL RADICALS , MANGANESE OXIDES , MAGNESIUM OXIDES , COUPLINGS , SURFACES , OXIDATION , HYDROCARBONS , PRESSURE , YIELD , CATALYSTS
Subject Categories : Organic Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE