Chemical Reaction Engineering
"A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?A. Inner catalyst core of radius R/8 does not participate in reaction."

Ffectiveness factor for a zero order reaction can not be 7/8 as it must always be 1
Inner catalyst core of radius R/2 does not participate in reaction
Inner catalyst core of radius 7R/8 does not participate in reaction
Inner catalyst core of radius R/8 does not participate in reaction

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

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

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Chemical Reaction Engineering
In an ideal P.F.R. at steady state conditions

The composition of reactants remains constant along a flow path
There is no lateral mixing of fluid
The conversion of the reactant varies from point to point along a flow path
There may be diffusion along the flow path

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