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

Conversion is cent per cent after three 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
The time required to process one reactor volume of feed (measured at specified conditions) is 3 hours

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Chemical Reaction Engineering
For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is

Desorption of C
Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase
Surface reaction between absorbed A and absorbed B
Surface reaction between A in the gas phase and absorbed B

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Chemical Reaction Engineering
For a heterogeneous catalytic reaction

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

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