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Hydroprocessing of heavy gas oils using FeW/SBA-15 catalysts: Experimentals, optimization of metals loading, and kinetics study

Paper ID Volume ID Publish Year Pages File Format Full-Text
54866 47029 2013 11 PDF Available
Title
Hydroprocessing of heavy gas oils using FeW/SBA-15 catalysts: Experimentals, optimization of metals loading, and kinetics study
Abstract

In the present work, a series of FeW/SBA-15 catalysts were prepared and screened for their hydrodesulfurization and hydrodenitrogenation activities using bitumen-derived heavy gas oil from Athabasca. A systematic process optimization study has been conducted to investigate the optimum process conditions required to evaluate kinetic parameters for these reactions. Catalyst metal loadings were varied from 0 to 5 and 15 to 45 wt.% for Fe and W, respectively; resulting in an optimum catalyst (Cat-5) with metal loadings of 3.0 and 30.0 wt.% for Fe and W, respectively. Several techniques were employed to characterize the prepared catalysts and activity results have been correlated with that obtained from characterization. Hydrotreating experiments were performed in a continuous flow micro trickle-bed reactor at the temperatures, pressures, and LHSVs of 633–693 °K, 7.6–9.6 MPa, and 0.5–2 h−1, respectively, with H2 flow rate and catalyst weight maintained constant at 50 mL/min and 1.5 g, respectively, in all cases. Three kinetic models were applied to fit experimental data obtained from HDS and HDN reaction studies evaluated within temperature range of 633–693 °K. The optimum operating conditions for maximum sulfur and nitrogen conversions occurred at temperature, pressure, and LHSV of 673 °K, 8.8 MPa, and 1 h−1, respectively. Experimental data fitted with the Power Law model yielded reaction orders of 2.0 and 1.5 for HDS and HDN reactions, respectively; and activation energies of 129.6 kJ/mol and 150.6 kJ/mol, respectively. By fitting a modified power law model (Multi-parameter model) to the kinetic data yielded hydrodesulfurization (HDS) and hydrotreating (HDN) reactions orders of 2.2 and 1.8, with respective activation energies of 126.7 kJ/mol and 118.8 kJ/mol.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (56 K)Download as PowerPoint slideHighlights► Process variables optimization study is critical to investigate the optimum process conditions. ► Catalyst with metal loadings of 3.0 wt.% Fe and 30.0 wt.% W was found to be optimum. ► Reaction orders of 2.0 and 2.2 was found for HDS reaction by the Power Law and Multi-parameter models.

Keywords
SBA-15; FeW Catalyst; HDS; HDN; Kinetics; Power Law; Multi-parameter models
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Hydroprocessing of heavy gas oils using FeW/SBA-15 catalysts: Experimentals, optimization of metals loading, and kinetics study
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 207, 30 May 2013, Pages 101–111
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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