Chemical Reaction Engineering
In case of staged packed bed reactors carrying out exothermic reaction, use

Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature
High recycle for pure gas
Plug flow for dilute liquid requiring no large preheating of feed
All of these

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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
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
The surface of the catalyst does not play an important role during reaction

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