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The catalytic cracking of cumene to benzene and propylene is accomplished using a silica-alumina catalyst. The reaction is 1st order in cumene and the rate constant was measured to be 0.80 cm³/(s*g catalyst). Assume that the catalyst is composed of spherical pellets. The radius of the pellet is 0.16 cm, the density is 1.3 g/cm³ and the effective diffusivity is 0.0008 cm² s²¹. Is the observed rate constant the true rate constant or is there an influence of pore diffusion? Justify your answer.

The catalytic cracking of cumene to benzene and propylene is accomplished using a silica-alumina catalyst. The reaction is 1st order in cumene and the rate constant was measured to be 0.80 cm³/(s*g catalyst). Assume that the catalyst is composed of spherical pellets. The radius of the pellet is 0.16 cm, the density is 1.3 g/cm³ and the effective diffusivity is 0.0008 cm² s²¹. Is the observed rate constant the true rate constant or is there an influence of pore diffusion? Justify your answer.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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The catalytic cracking of cumene to benzene and propylene is accomplished using a silica-alumina catalyst. The reaction is 1st order in cumene and the rate constant was measured to be 0.80 cm³/(s*g catalyst). Assume that the catalyst is composed of spherical pellets. The radius of the pellet is 0.16 cm, the density is 1.3 g/cm³ and the effective diffusivity is 0.0008 cm² s²¹. Is the observed rate constant the true rate constant or is there an influence of pore diffusion? Justify your answer.
Transcribed Image Text:The catalytic cracking of cumene to benzene and propylene is accomplished using a silica-alumina catalyst. The reaction is 1st order in cumene and the rate constant was measured to be 0.80 cm³/(s*g catalyst). Assume that the catalyst is composed of spherical pellets. The radius of the pellet is 0.16 cm, the density is 1.3 g/cm³ and the effective diffusivity is 0.0008 cm² s²¹. Is the observed rate constant the true rate constant or is there an influence of pore diffusion? Justify your answer.
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