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Study for the production of ultra-low sulfur gas oils on a highly loaded NiMoW catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
53503 46972 2016 8 PDF Available
Title
Study for the production of ultra-low sulfur gas oils on a highly loaded NiMoW catalyst
Abstract

•A highly loaded NiMoW catalyst showed high hydrodesulfurization activities of gas oils.•The distributions of refractory sulfur-containing compounds at three sulfur levels (100, 50, and 10 μg/g) were investigated.•Ultra-low sulfur gas oils were obtained by adjustments of the technical conditions.

Deep hydrodesulfurization (HDS) of gas oil has become one of the most important subjects in the production of fuels, as increasingly stringent quality standards for gas oil have been introduced all around the world. We studied the technical conditions (temperature, hydrogen pressure, liquid hourly space velocity, and H2/oil volume ratio) for the deep HDS of fluid catalytic cracking (FCC) and coking gas oils over a highly loaded NiMoW catalyst and compared its activity and the removal of the refractory dibenzothiophenes (DBTs) with those of a commercial NiMo/γ-Al2O3 catalyst and a highly loaded NiMo catalyst. The FCC gas oil, which had a lower sulfur content and simpler composition than the coking gas oil, was relatively easy to process. The coking gas oil and another FCC gas oil, of poor quality with more complex compositions, required more stringent reaction conditions. The sulfur distributions in gas oils hydrotreated to a level of 100, 50, and 10 μg/g sulfur were investigated. 4-Methyldibenzothiophene could be totally removed when the coking gas oil was hydrotreated to a level of 50 μg/g S. Only 4,6-dimethyldibenzothiophene and 2,4,6-trimethyldibenzothiophene were detected in the deep HDS to a level less than 10 μg/g S. This is attributed to the steric hindrance of substituted-alkyls at the 4 and/or 6 positions of DBT. The highly loaded NiMoW catalyst had a higher activity than a highly loaded NiMo catalyst and a commercial NiMo/γ-Al2O3 catalyst, and was more suitable for the production of ultra-low-sulfur gas oils.

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Keywords
Highly loaded catalyst; Hydrodesulfurization; NiMoW catalyst; Dibenzothiophene; 4,6-Dimethyldibenzothiophene; 2,4,6-Trimethyldibenzothiophene
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Study for the production of ultra-low sulfur gas oils on a highly loaded NiMoW catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 259, Part 2, 1 January 2016, Pages 409–416
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