Chemical Reaction Engineering
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the

Catalyst size is increased or the catalyst diffusivity is increased
Catalyst size is increased or the catalyst diffusivity is reduced
Catalyst size is reduced or the catalyst diffusivity is increased
Catalyst size is reduced or the catalyst diffusivity is reduced

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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
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
Conversion is cent per cent after three hours

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