Magnesia chromia catalyst

Fig. 9. Dependence of the yield of C02 upon the concentration of H3PO4 or NajSiOa added to magnesia-chromia catalyst.

The reactions studied were the extensive oxidation of isooctane and of ethylene over magnesia-chromia and copper-chromia and of ethylene over tungstic oxide. The catalysts used in the oxidation of isooctane differed greatly with respect to their activities and the observed value of activation energy and frequency factor, as is indicated in Table V. 

Fig. 14. Dependence of the logarithm of the frequency factor upon the energy of activation when different additive components are combined with magnesia-chromia and copper-chromia catalysts.

The addition of chromia and magnesia to ahimina enhances conversion of CFC-12 even at a tenq)erature of 275°C conq>ared to the other catalysts in the CMA coprecipitated catalyst. And high selectivity towards fluorine rich conqx>und CFC-13 is maintained at all temperatures. The constant high conversions beyond 375°C on more active catalysts i.e. on CMA, CA-I, CA-C indicate the possibility of occurrence the... 

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