it is suggested to subject the catalyst - supporting structure with attached to it catalyst to electromagnetic field generated inside the catalytic reactor by an induction coil or by microwave - generator , with the support structure being made from materials exhibiting a significantly lesser absorption of the electromagnetic energy than the catalyst material so that absorption by the catalyst or by catalyst carrier material of energy from the electromagnetic field results in fast heating of the catalyst to its working temperature without a significant heating of the catalyst support structure , thus with a small overall consumption of energy .