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Hydrodesulfurization enhancement of heavy and light S-hydrocarbons on NiMo/HMS catalysts modified with Al and P

Paper ID Volume ID Publish Year Pages File Format Full-Text
39657 45830 2014 14 PDF Available
Title
Hydrodesulfurization enhancement of heavy and light S-hydrocarbons on NiMo/HMS catalysts modified with Al and P
Abstract

•Hydrodesulfurization of S-content model molecules presents in diesel and gasoline fractions.•The phosphorus enhancement both light and deep hydrodesulfurization ability.•The phosphorus enhancement amount of promoted sites in the active NiMoS phase.

Deep hydrodesulfurization (HDS) of oil fractions is a key process in petroleum refineries due to the increasing demand for S-free diesel and gasoline fractions. In this work, a series of NiMo catalysts supported on Al- and P-modified HMS mesoporous substrate were tested in the HDS of thiophene and 4,6-dimethyldibenzothiophene (4,6-DMDBT) to evaluate the effect of Al and P additives on the catalyst response in HDS reactions (thiophene at 1 bar and 4,6-DMDBT at 5.5 MPa). The catalysts were characterized by a variety of techniques (XRD, N2 adsorption–desorption, TPR, TPS, FT-IR of adsorbed pyridine, UV–vis and H2 chemisorption). NiMo/Al-HMS-P catalyst containing 1.0 wt.% of P exhibited the best performance in both HDS reactions as a consequence of the proper balance between the active phase dispersion and the largest hydrogenation ability among the studied catalysts. The 4,6-DMDBT HDS reaction proceeded toward direct desulfurization (DDS) and hydrogenation (HYD) reaction routes. Concerning the HDS of thiophene, the increase of the catalyst acidity led to the formation of butadiene and diminished the hydrogenation of olefins (formation of butane). At the reaction temperature of 320 °C, the NiMo/Al-HMS-P1.0 catalyst exhibited the highest activity and the lowest butane formation among the catalysts studied. The isomerization of olefins in the thiophene HDS reaction did not occur, in line with the observed absence of isomerization in the 4,6-DMDBT HDS reaction.

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Keywords
Hydrodesulfurization; Thiophene; 4,6-Dimethyldibenzothiophene; Catalysts; Mesoporous materials; Heavy and light S-hydrocarbons
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 484, 22 August 2014, Pages 108–121
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