Comprehensive kinetic model for acetylene pretreated mesoporous silica supported bimetallic Co-Ni catalyst during fischer-trospch synthesis

Document Type

Journal Article

Publication Title

Chemical Engineering Science

Volume

246

Publisher

Elsevier

School

School of Engineering

RAS ID

38841

Funders

Qianjiang Talent Scheme University of Nottingham Ningbo Municipal Commonweal Key Program UNNC FoSE New Researchers Grant

Comments

Sun, Y., Wang, Y., He, J., Yusuf, A., Wang, Y., Yang, G., & Xiao, X. (2021). Comprehensive kinetic model for acetylene pretreated mesoporous silica supported bimetallic Co-Ni catalyst during fischer-trospch synthesis. Chemical Engineering Science, 246, article 116828. https://doi.org/10.1016/j.ces.2021.116828

Abstract

A new model by incorporating the porosity field during acetylene pretreatment (PT) into the Fischer-Trospch (FT) synthesis comprehensive kinetic is proposed for quantitatively describing the product distributions using a mesoporous silica supported Co-Ni bimetallic catalyst. Coupling the quasi-homogeneous medium model with the acetylene reaction kinetics via the Langmuir-Hinshelwood-Hougen-Watson (LHHW) approach, the model yields good predictions for breakthrough curves, pressure drops, and permeability during PT process. The active carbidic intermediates formed by the acetylene PT engaged with the subsequent CO dissociation and 1-olefin re-adsorption associated secondary reactions during FT synthesis. The constructed comprehensive kinetic model can predict the olefin to paraffin ratios (OPR) versus chain length when the catalyst was pretreated. A relatively good prediction from chain length dependent model (CLD) indicates the validity of assuming that Van Waals forces play a critical role during olefin re-adsorption in the secondary reactions for chain propagations once the mesoporous supported Co-Ni bimetallic catalyst was pretreated by acetylene. The proposed model successfully bridges the gaps between the PT and FT process at the investigated experimental conditions.

DOI

10.1016/j.ces.2021.116828

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