DURABLE CHANGES OF THE CATALYTIC PROPERTIES OF ALUMINA-SUPPORTED PLATINUM INDUCED BY MICROWAVE IRRADIATION

The isomerization of 2-methylpentane over a 0.2 wt% platinum dispersed on gamma-alumina catalyst is studied when the catalyst is heated eith er by microwave irradiation or by a classical oven. The selectivity fo r isomerization is considerably increased, from 45 to 80%, when the ca talyst has been previously treated by microwaves or when the catalytic reaction is performed under the electromagnetic field. The isomerizat ion power of such an irradiated catalyst remains high even when it is subsequently tested according to classical conditions. It is consequen tly suggested that the microwaves induced durable and profitable modif ications of the catalytic behaviour of alumina-supported platinum.