CATALYZED REACTIONS OF ALKYLAROMATIC HYDROCARBONS DISSOLVED IN SUPERCRITICAL FLUIDS.

Document Type

Conference Proceeding

Publication Date

12-1-1987

Abstract

The results of toluene oxidation experiments in a tubular fixed-bed reactor using an SC feed of CO//2, toluene, and air indicate that strongly acidic catalysts such as H-Y zeolite are inactive and that of the many supported metal oxides tested (Co, Mo, Co-Mo, and Ni-W oxides supported on gamma -Al//2O//3), the one whose active component was mostly CoO is the most active and also the most selective for partial oxidation to benzaldehyde and benzoic acid. Some results comparing this catalyst to a similar one containing mostly Co//3O//4 are given. The turnover numbers for partial oxidation are in the 10** minus **7-10** minus **4/s range, with the reactor operated differentially at conversions less than 2%; these rates are based on moles of total active metal. The relatively high catalyst activities in the SCF oxidation process appear to be the result of a pressure effect. The more than twofold increase in rate might be explained by the effect of pressure on the concentration-based rate constant. Another possible explanation for the pressure effect is a pressure-dependent variation of O//2 concentration in the condensed 'pore' phase of the catalyst.

Publication Source (Journal or Book title)

ACS Division of Fuel Chemistry, Preprints

First Page

359

Last Page

367

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