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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258801.pdf


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