Methane Activation and Conversion to Higher Hydrocarbons on Supported Ruthenium

The interaction of methane with silica-supported Ru has been investigated. Methane is found to undergo dissociative adsorption above 373 K. The prexponential factor for dissociative adsorption is 2.0×10−7–5.7×10−7and the activation energy is 5.9–7.0 kcal/mol. Three types of carbon are formed, design...

Full description

Saved in:
Bibliographic Details
Published in:Journal of catalysis 1996-06, Vol.161 (1), p.423-429
Main Authors: Carstens, Jason N., Bell, Alexis T.
Format: Article
Language:English
Subjects:
Catalysis
Catalytic reactions
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The interaction of methane with silica-supported Ru has been investigated. Methane is found to undergo dissociative adsorption above 373 K. The prexponential factor for dissociative adsorption is 2.0×10−7–5.7×10−7and the activation energy is 5.9–7.0 kcal/mol. Three types of carbon are formed, designated as Cα, Cβ, and Cγ. The distribution among these species is dependent on the total carbon coverage and the length of time that the carbon has been aged at given temperature after deposition. Aging results in the conversion of Cβto Cα. The apparent activation energy for this process is 22 kcal/mol. Hydrogenation of the carbonaceous deposit produces methane and smaller quantities of ethane and propane. The distribution among these products depends on the surface coverage of carbon and the temperature of hydrogenation. Both the distribution of carbonaceous species present on the catalyst surface after dissociative adsorption of CH4and the distribution of alkanes formed upon isothermal hydrogenation of the carbonaceous deposit depend on whether or not the catalyst has been carburized.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1996.0200