Chemical Reaction Engineering
Organic catalysts differ from the inorganic catalyst in the sense that the former is

Active at very high temperature only
Prohibitively costly
Active at cryogenic temperatures only
Proteinous in nature

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

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

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