KINETICS AND MECHANISMS OF CATALYTIC REDUCTION PROCESSES. Final Terminal Report
Studies were made of the nature of catalysts, reactants, and extraneous material in catalytic reduction reactions. An investigation was made of the decomposition of nitric oxide on an aluminum oxide catalyst. The resulting rate of decomposition was correlated for all runs as a function of nitric oxide concentration. The mechanism suggested is the reaction of two nitric oxide molecules, absorbed on adjacent single sites as the slow step, with nitrogen and nitric oxide in equilibrium between gas and adsorbed phases. On prolonged heating of the aluminum oxide at 742 deg C, the catalyst activity decreased. The kinetics of dehydrogenation of methylcyclohexane to toluene on a chromia- alumina catalyst were studied at atmospheric pressure in the temperature range 380 to 480 deg C. The catalyst exhibited reversibly unstable activity in the temperature range 380 to 420 deg C. At 420 deg C and above the activity remained stable. It was concluded that the rate of formation of toluene was controlled by the rate of surface reaction of methylcyclohexane adsorbed on a single site and that the rate was retarded by the presence of hydrogen. A flow reactor, operated differentially at atmospheric pressure, was used to study the catalytic reduction to nitric oxide by hydrogen and by methane at temperatures of 375 to 800 deg C. The catalyst used was oxides of copper, zinc, and chromium. Both reduction to nitrogen and reduction to ammonia were studied. The kinetics of the dehydrogenation of isopropanol to acetone on a zinc oxide catalyst at atmospheric pressure and in the temperature range of 271 to 316 deg C using a tubular flow reactor was studied. Results showed that the rate-controlling step of the reaction is either single or dual site surface reaction rate. (M.C.G.)
- Research Organization:
- Illinois. Univ., Urbana. Engineering Experiment Station
- NSA Number:
- NSA-17-018011
- OSTI ID:
- 4736778
- Report Number(s):
- TID-18423
- Country of Publication:
- United States
- Language:
- English
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