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Activity and surface properties of NiMo/SiO2–Al2O3 catalysts for hydroprocessing of heavy oils

Paper ID Volume ID Publish Year Pages File Format Full-Text
40919 45871 2012 12 PDF Available
Title
Activity and surface properties of NiMo/SiO2–Al2O3 catalysts for hydroprocessing of heavy oils
Abstract

NiMo/SiO2–Al2O3 mixed oxide supported catalysts were investigated for hydroprocessing of heavy crude oil at moderate reaction conditions. Hydrodesulfurization (HDS), hydrodemetalization (HDM), hydrodeasphaltenization (HDAs) and hydrodenitrogenation (HDN) reactions were studied as function of time-on-stream (TOS). The results indicated that HDS of crude oil corresponds to the number of active metal sites (sulfide phases) present in the catalyst, HDN is enhanced when the catalyst presents a combination of well dispersed sulfide phases and weak to moderate acidity. HDM presented a complex behavior indicating that it is affected significantly not only by the dispersion of the sulfide phase but also by the porosity and acidity of the catalyst. As expected, for HDAs both acidity and textural properties are important. The stability of the catalyst with time-on-stream was affected by coke and metals deposition. The supports and fresh catalysts were characterized by nitrogen physisorption, SEM-EDX, and FT-IR of CO and pyridine adsorption. The results confirm that NiMo/SiO2–Al2O3 catalysts are a good option for the hydrotreatment of heavy oils and that the method used here for support preparation can tune the formation of meso- or macro-porosity and the type and strength of the catalyst acid sites.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (74 K)Download as PowerPoint slideHighlights► NiMo/SiO2–Al2O3 catalysts synthesized and characterized by several techniques. ► Catalysts tested at different reaction scales including heavy oil hydrotreating. ► Sulfur removal corresponds to the number of active metal sites. ► Metal removal is affected by dispersion of sulfide phase, porosity and acidity. ► For removal of asphaltenes both acidity and textural properties are important.

Keywords
NiMo/SiO2–Al2O3 catalysts; FT-IR; CO adsorption; Hydrotreating; Heavy oil
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Activity and surface properties of NiMo/SiO2–Al2O3 catalysts for hydroprocessing of heavy oils
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 425–426, 28 May 2012, Pages 1–12
Authors
, , , , , , ,
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