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CO-insertion mechanism based kinetic model of the Fischer–Tropsch synthesis reaction over Re-promoted Co catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
54125 46998 2014 8 PDF Available
Title
CO-insertion mechanism based kinetic model of the Fischer–Tropsch synthesis reaction over Re-promoted Co catalyst
Abstract

•Detailed kinetic model of FTS over promoted Co catalyst was developed.•Model was derived based on the CO-insertion mechanism and LHHW methodology.•Chain length dependent desorption of 1-olefins is used to explain the increase in growth probability and decrease in olefin-to-paraffin ratio with increase in carbon number.•Physical meaningfulness of the model and its parameters was verified.•A good prediction of the product formation rates for C1–15n-paraffins and C2–15 1-olefins for a range of process conditions was obtained.

A detailed kinetic model of the Fischer–Tropsch synthesis (FTS) product distribution based on the CO-insertion mechanism has been derived. The model was developed using the Langmuir–Hinshelwood–Hougen–Watson approach. The intrinsic kinetic parameters were estimated using a set of data obtained in a stirred tank slurry reactor with a rhenium promoted cobalt catalyst over a range of operating conditions (T = 478, 493, 503 K; P = 1.5, 2.5 MPa; H2/CO = 1.4, 2.1; WHSV = 1.0–22.5 NL/gcat/h). Physical meaningfulness of the model and its parameters was verified. Consistent with reported measurements, model predicts that adsorbed CO is the most abundant surface species. The observed increase in the chain growth probability factor and decrease in olefin-to-paraffin ratio with increase in carbon number is explained utilizing the chain length dependent desorption of 1-olefins concept.

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Keywords
Fischer–Tropsch synthesis; Kinetic modeling; CO-insertion; Slurry reactor; Cobalt catalyst; Rhenium promoter
First Page Preview
CO-insertion mechanism based kinetic model of the Fischer–Tropsch synthesis reaction over Re-promoted Co catalyst
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 228, 1 June 2014, Pages 32–39
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis