Question

A) It is suggested that an irreversible catalytic cracking reaction, such as A--> B+C+D  can be represented using a Langmuir-Hinshelwood model. Derive a rate equation considering following:

-The surface reaction involving the cracking of adsorbed A is the rate limiting step.

-An inert impurity (I) is also present in the feed that also compete for active site

-All species adsorbs on the catalyst sites.

B) Derive a simplified version of the equation of section (A) with weakly adsorbed products C and D

Answer 1

A) Given, An irreversible catalytic reaction A B+ C+ D Using Langmuir-Hinshelwood model; 1) Adsorption of A on catalyst site 2) Conversion of adsorbed A into B k2 3) Conversion of adsorbed A into C 4) Conversion of adsorbed A into D k-4 5) Desorption of k-5 6) Desorption of C k-5 7) Desorption of D k7

A) Given, An irreversible catalytic reaction A B+ C+ D Using Langmuir-Hinshelwood model; 1) Adsorption of A on catalyst site 2) Conversion of adsorbed A into B k2 3) Conversion of adsorbed A into C 4) Conversion of adsorbed A into D k-4 5) Desorption of k-5 6) Desorption of C k-5 7) Desorption of D k7