Chemical Reaction Engineering
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

None of these
Very low temperature should be used throughout the reaction
Temperature should be high in the beginning and decreased towards the end of the reaction
Very high temperature should be used throughout the reaction

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

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