Chemical Reaction Engineering
For a heterogeneous catalytic reaction

Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction
A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important
The catalyst does not form an intermediate complex with the reactant
The surface of the catalyst does not play an important role during reaction

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Chemical Reaction Engineering
A space time of 3 hours for a flow reactor means that

The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours
It takes three hours to dump the entire volume of the reactor with feed
Three reactor volumes of feed can be processed every hour
Conversion is cent per cent after three hours

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