Cyclohexane dehydrogenation over a strained-layer Cu/Ru catalyst

Journal Article · Fri Aug 01 00:00:00 EDT 1986 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(86)90123-5· OSTI ID:5522276

Peden, C H.F.; Goodman, D W

The present studies are part of a continuing effort to identify those properties of a bimetallic system which can be related to its special catalytic properties. The specific model system of Cu and Ru was chosen due to the immiscibility of these two metals as well as the pivotal role played by this metal pair in historical bimetallic studies. The immiscibility of these two metals facilitates coverage determination by temperature-programmed desorption (TPD) and circumvents the many complications associated with the assay of alloy surface composition. The results are discussed from previous studies which have addressed the geometric and electronic structure of Cu overlayers on Ru(0001), the adsorption of CO and H/sub 2/ on submonolayer-to-multilayer deposits of Cu, as well as the measurement of the high-pressure kinetics of the methanation and ethane hydrogenolysis reactions on this model bimetallic catalyst. These results suggest that Ru specific rates for methanation and ethane hydrogenolysis on supported Cu/Ru catalysts approximate those values found for pure Ru. As a consequence, the rates for the cyclohexane dehydrogenation reaction on supported Cu/Ru, similarly corrected, must exceed those specific rates found for pure Ru. (The uncorrected specific rates for the supported Cu/Ru system remain essentially unchanged upon addition of Cu to Ru.) An activity enhancement for cyclohexane dehydrogenation in the mixed Cu/Ru system relative to pure Ru is most surprising given that Cu is less active for this reaction than Ru. In this note, the authors report just such an activity enhancement for the addition of Cu to a model Ru(0001) catalyst. 16 references.

• Research Organization: Sandia National Labs., Albuquerque, NM
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5522276
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 100:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
ALLOYS
BIMETALS
CATALYSIS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COPPER ALLOYS
CYCLOALKANES
CYCLOHEXANE
DEHYDROGENATION
DISPERSIONS
ELECTRONIC STRUCTURE
ETHANE
FISCHER-TROPSCH SYNTHESIS
HYDROCARBONS
KINETICS
MIXTURES
ORGANIC COMPOUNDS
PLATINUM METAL ALLOYS
REACTION KINETICS
REFORMER PROCESSES
RUTHENIUM ALLOYS
SURFACE PROPERTIES