Contribution to the Study of Catalytic Hydrogen-Deuterium Exchange Between Hydrogen and Hydrocarbons; CONTRIBUTION A L'ETUDE DE L'ECHANGE CATALYTIQUE HYDROGENE- DEUTERIUM ENTRE L'HYDROGENE ET LES HYDROCARBURES

Thesis/Dissertation · Sat Dec 20 04:00:00 EST 1958

OSTI ID:4169614

Ravoire, J

The hydrogen-deuterium exchange between molecular hydrogen and hydrocarbons over a platinum and charcoal catalyst was studied in a static system. The change in isotopic composition of molecular hydrogen was followed by a thermal conductivity method. Cyclopentane and cyclohexane were chosen because of their stability. A reversible inactivation of the catalyst was observed with both hydrocarbons. The reasons for this inactivation are unknown but it was shown that reactivation led to satisfactory reproducibility. A kinetic study was done with cyclohexane in the range 30 to 160 deg C, and 40 to360 mm for the pressure of hydrogen, and 10 to 70 mm for the pressure of cyclohexane. The order of the reaction with respect to cyclohexane pressure is always close to zero; the order with respect to that of hydrogen is 0.5 above 100 deg C. It decreases with increasing temperature and becomes negative (--0.5 at30 deg C), characterizing an inhibition by hydrogen. At the same time, the apparent activation energy goes from 6 to 13 kcal/mole. (auth)

• Research Organization: France. Commissariat a l'Energie Atomique, Paris
• NSA Number: NSA-14-008393
• OSTI ID: 4169614
• Report Number(s): CEA-1066
• Country of Publication: France
• Language: English

Related Subjects

ACTIVATED CARBON
CATALYSIS
CHEMISTRY
CYCLOALKANES
DEUTERIUM
HEXANE
HYDROCARBONS
HYDROGEN
ISOTOPIC EXCHANGE
PENTANE
PLATINUM
PRESSURE
REACTION KINETICS
STABILITY
TEMPERATURE
THERMAL CONDUCTIVITY