By W G Frankenberg

ISBN-10: 0080565131

ISBN-13: 9780080565132

ISBN-10: 0120078090

ISBN-13: 9780120078097

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Extra resources for Advances in Catalysis and Related Subjects, Volume 9

Example text

Roy. A177, 62 (1940). 7. Twigg, G. , and Rideal, E. , Trans. Faraday Soc. 36, 533 (1940). 8. Kehrer, V. , J. Phys. Chem. 68. 550 (1954). 9. Dowden, D. , J . Chem. p. 242 (1950). 6 A Study of the Ethylene-Deuterium Catalytic System DONALD 0. SCHISSLER,* SIDNEY 0. THOMPSON,? AND JOHN TURKEVICH Department of Chemistry, Princeton University, Princeton, New Jersey, and the Brookhaven National Laboratory, Upton, Long Island, New York A report is given of the reaction of ethylene and deuterium over nickel on kieselguhr, nickel wire, palladium on charcoal, and palladium on silica gel catalysts at temperatures from -98 t o 110" and at pressures of 50 atm.

Following exposure to argon the hydrogen and ethylene were introduced in three ways. If the crystal was exposed first to ethylene alone and then to a hydrogen-ethylene mixture, the activity was reduced. If the hydrogen and ethylene were added simultaneously or the hydrogen first, the catalyst was active. The argon treatment produced surfaces which were less active in every case, the difference being about 20-30 % . Nickel crystals were exposed to ethylene alone at a higher temperature in hope of correlating the rates of hydrogenation of ethylene with its rates of decomposition on different faces.

Also the ratio of cis- to trans-l,2-dimethylcyclohexaneis the same as in a completely reduced sample. These facts exclude the formation of an isomeric olefin which escapes from the catalyst into the bulk phase because the possible olefins do not react at significantly different rates under these conditions. This last fact is consistent with published information (16). Furthermore, the isomerization of the principal product, cis-l ,2dimethylcyclohexane, was not detected under the reaction conditions in ten times the reaction time.

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Advances in Catalysis and Related Subjects, Volume 9 by W G Frankenberg


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