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Catalytic performance of CoMo/Al2O3-MgO-Li(x) formulations in DBT hydrodesulfurization

Paper ID Volume ID Publish Year Pages File Format Full-Text
53518 46973 2016 10 PDF Available
Title
Catalytic performance of CoMo/Al2O3-MgO-Li(x) formulations in DBT hydrodesulfurization
Abstract

•A higher content of Li in the catalytic formulation promotes a variety of basic sites.•Li incorporation changes the dispersion and distribution of CoMo active phases.•Li incorporation into the catalyst enhances selectivity toward biphenyl products in almost 200%.

In this work, it is reported the catalytic performance of low acidity catalysts in the hydrodesulfurization reaction of dibenzothiophene. Catalytic CoMo formulations supported on materials based on Al2O3-MgO modified with several amounts of lithium oxide (x = 1, 5 and 10 wt.% of Li2O) were used. It was correlated the effect of the atomic lithium content on the dispersion of the Mo and Co phases in their oxidized and sulfided forms, in order to explain their catalytic performance. Elemental chemical composition on the catalyst surface as well as sulfurization degree and the interaction of sulfided Co and Mo phases with the support were determined by X-ray photoelectron spectroscopy (XPS). Textural properties were measured by N2 physisorption technique; the identification of the crystalline phases was studied by X-ray powder diffraction (XRD) and Raman spectroscopy (RS). The chemical coordination state was determined from diffuse reflectance spectroscopy (DRS) measurements. Reducibility was determined by temperature programmed desorption (TPR). Dispersion of MoS2 crystallites was revealed by high resolution transmission electron microscopy (HRTEM). Catalytic activity of the formulations was evaluated using a pressurized batch reaction system through the hydrodesulfurization reaction of dibenzothiophene as a model molecule, selectivity toward direct desulfurization reaction route was studied following the biphenyl and cyclohexylbenzene reaction products identified by using gas chromatography; results show that there is an optimal amount of 3.7 at.% of Li, which maintains hydrodesulfurization function and decrease the hydrogenation function compared to the conventional CoMo catalyst.

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Keywords
Low acidity catalysts; DBT hydrodesulfurization; Direct desulfurization; CO2 thermodesorption
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Catalytic performance of CoMo/Al2O3-MgO-Li(x) formulations in DBT hydrodesulfurization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 271, 1 August 2016, Pages 35–44
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us