Kinetics of zeolite-catalyzed heptane hydroisomerization and hydrocracking with CBMC-modeled adsorption terms: Zeolite Beta as a large pore base case

Agarwal, Umang; Rigutto, Marcello S.; Zuidema, Erik; Jansen, A. P.J.; Poursaeidesfahani, A.; Sharma, S.; Dubbeldam, David; Vlugt, T.J.H.

doi:10.1016/j.jcat.2022.09.026

Kinetics of zeolite-catalyzed heptane hydroisomerization and hydrocracking with CBMC-modeled adsorption terms

Title

Kinetics of zeolite-catalyzed heptane hydroisomerization and hydrocracking with CBMC-modeled adsorption terms: Zeolite Beta as a large pore base case

Author

Agarwal, Umang (Shell Global Solutions International B.V.)
Rigutto, Marcello S. (Shell Global Solutions International B.V.)
Zuidema, Erik (Shell Global Solutions International B.V.)
Jansen, A. P.J. (Shell Technology Centre Bangalore)
Poursaeidesfahani, A. (TU Delft Process and Energy)
Sharma, S. (Shell Technology Centre Bangalore)
Dubbeldam, David (Universiteit van Amsterdam)
Vlugt, T.J.H. (TU Delft Engineering Thermodynamics)

Department

Process and Energy

Date

2022

Abstract

A reactor model that deconvolutes thermodynamics of adsorption of hydrocarbon in the pores of zeolite Beta, obtained by Configurational-bias Monte Carlo simulations, from intrinsic, intraporous kinetics of hydroisomerization and hydrocracking reactions, provides a good quantitative description of all significant reactions in the kinetic network for interconversion and cracking of different heptane isomers. Activation enthalpies obtained for intraporous reactions follow the expected order according to the carbenium ion formalism: methyl shift< ethyl shift < isom(B) ∼ crack(B2) < crack(B1) < crack(C) ∼ crack(D) < crack(E) and apparently within each isomerization class, in terms of carbenium ions formally involved: sec → tert < sec → sec ∼ tert → tert < tert → sec. except for the ethyl shift reaction forming 3-ethylpentane. Cracking happens primarily through 2,4-dimethylpentane (type B2), regardless of the initial reactant. The model can be subsequently used to separate the effect of pore structure on selective adsorption and on intraporous reaction kinetics. Zeolite Beta will serve as a base case for a comparison of different zeolite structures.

Subject

Bifunctional catalysis
Hydrocracking
Hydroisomerization
Molecular simulation
Shape selectivity
Zeolite catalysis

To reference this document use:

http://resolver.tudelft.nl/uuid:3869e9ce-d1b9-4cca-b820-d10f3e302ea0

DOI

https://doi.org/10.1016/j.jcat.2022.09.026

ISSN

0021-9517

Source

Journal of Catalysis, 415, 37-50

Part of collection

Institutional Repository