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Slurry-phase hydrocracking of vacuum residue with a disposable red mud catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
40634 45860 2012 7 PDF Available
Title
Slurry-phase hydrocracking of vacuum residue with a disposable red mud catalyst
Abstract

In this study, red mud (RM) was used as a catalyst in slurry-phase hydrocracking of vacuum residue (VR) in batch system. Without RM, thermal cracking occurred and a lighter fraction and higher conversion was achieved than in the presence of catalyst. However, the catalytic cracking obviously inhibited both the coke formation and residue cracking reaction. We investigated the influence of reaction temperature, reaction time and RM concentration on VR conversion. Reaction temperature and time significantly improved the yield of naphtha, diesel and vacuum gas oil; unfortunately, they also increased the gas fraction, which is an undesirable product. Catalyst concentration negligibly affected the VR conversion while vacuum gas oil fraction in product distribution increased with catalyst concentration, indicating that the cracking reaction was suppressed in the presence of catalyst. Through the characterization of fresh and spent catalysts by diverse techniques, it has been determined that the crystalline iron oxide of RM transforms into pyrrhotite (Fe(x−1)Sx), an active phase for the hydrocracking reaction, due to presence of sulfur in VR. Our results show that RM is possibly self-activated during the reaction and the pretreatment step can be eliminated.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (144 K)Download as PowerPoint slideHighlights► Red mud was used as a catalyst in slurry-phase hydrocracking of vacuum residue. ► The conversion of feedstock to distillate was thermally controlled. ► Coke formation and cracking reaction were suppressed in the presence of catalyst. ► Pyrrhotite (Fe(x−1)Sx) was formed during reaction due to presence of sulfur in feed. ► Red mud was possibly self-activated during the reaction.

Keywords
Red mud; Vacuum residue; Slurry-phase; Hydrocracking
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Slurry-phase hydrocracking of vacuum residue with a disposable red mud catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 447–448, 7 December 2012, Pages 186–192
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