Express your view on space velocity ?

It describes the effects of transport phenomena due to gas flow, catalyst and reactor geometry.

It also explains how to design an experiment in order to avoid mass transport limitations and to ensure chemical kinetics control (a must for catalytic activity measurements)

I hope that this might help answer your question.

I agree with everyone and would like to add also that when comparing catalysts on a reaction, we should know whether there are mass transfer limitations present or not

I agree with everyone and would like to add also that when comparing catalysts on a reaction, we should know whether there are mass transfer limitations present or not

To be totally honest in comparing catalytic activities, we should design in order to eliminate mass transfer phenomena, however the knowledge of conversions achieved per unit mass of catalyst with mass transfer limitations has its own value in many cases.

however the knowledge of conversions achieved per unit mass of catalyst with mass transfer limitations has its own value in many cases.

Mass transfer limitations can be important in some cases. In the case of a suspension of photocatalytic