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Silica poisoning in HDT catalysts by light coker naphtha

Paper ID Volume ID Publish Year Pages File Format Full-Text
40761 45864 2012 5 PDF Available
Title
Silica poisoning in HDT catalysts by light coker naphtha
Abstract

γ-Alumina-based HDT catalysts used as silicon traps adsorb more efficiently silicon compounds from naphtha till saturation, which occurs at a relatively low concentration (5–10 wt%). As the silicon content in the catalyst increases, the surface is progressively deactivated, mainly affecting the hydrodenitrogenation and hydrogenation activity. According to the aforementioned, the deactivation of HDT catalysts was investigated by means of a fraction of naphtha doped with silicone oil with different concentrations, which was used to contaminate the catalysts. The presence of silicon species was detected by 29Si NMR and FTIR spectroscopies. The SiOAl formation was evidenced by the B/L ratio measured for the doped HDT catalysts. The results obtained for the deactivation of HDT catalysts exposed to high silicon contents show that this factor plays a major role in the loss of activity.

Graphical abstractSilicon content on doped HDT catalyst.Figure optionsDownload full-size imageDownload high-quality image (173 K)Download as PowerPoint slideHighlights► The rate of adsorption is controlled by the transformation of silicon species. ► Silicon species interact with the alumina surface, forming Brønsted acid sites. ► The amount of silicon plays a major role for HDN and hydrogenation reactions.

Keywords
Silica poisoning; HDT alumina catalyst; Silicon compounds; Coker naphtha; Deactivation; FTIR
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 449, 27 December 2012, Pages 183–187
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