Chemical Reaction Engineering
For a heterogeneous catalytic reaction

The catalyst does not form an intermediate complex with the reactant
The surface of the catalyst does not play an important role during 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

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Chemical Reaction Engineering
Batch process is preferred over continuous process, when the

Sales demand of product is not steady
All of these
Product yields and quality can not be achieved in continuous process, because of long residence time
Same equipment can not be used for several processes of the same nature

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Chemical Reaction Engineering
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

τ = θ , for a non-isothermal reactor
τ = θ , when the fluid density changes in the reactor
τ and θ are always equal
τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant

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