A spherical porous catalyst particle of radius R is subjected to reactant A whic

MCQ Practice

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 $$frac{7}{8}$$. Which of the following statement is true?

Subject: Chemical EngineeringTopic: Chemical Reaction Engineering

Inner catalyst core of radius $$frac{{text{R}}}{8}$$ does not participate in reaction

Inner catalyst core of radius $$frac{{text{R}}}{2}$$ does not participate in reaction

Inner catalyst core of radius $$frac{{7{text{R}}}}{8}$$ does not participate in reaction

Effectiveness factor for a zero order reaction can not be $$frac{7}{8}$$ as it must always be 1

Correct Answer: A