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Coke chemistry under vacuum gasoil/bio-oil FCC co-processing conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
53466 46971 2015 13 PDF Available
Title
Coke chemistry under vacuum gasoil/bio-oil FCC co-processing conditions
Abstract

•Two main interacting processes for coke formation are revealed.•Synergy between fossil hydrocarbons and lignocellulosic oxygenates fragments cracking routes.•Both EFAL and FAL acid centers active for co-processing.•Three types of coke identified with different structure, location and ability to be oxidized.

This study presents an in depth investigation of the coke chemistry occurring in FCC and USY catalysts during co-processing of fossil feeds (VGO type) blended with various types of upgraded bio-oils produced by fast pyrolysis of lignocellulosic bio-mass. It includes a brief survey of previous studies devoted to the effect of co-processing on FCC products yield and quality. A combination of two main processes is proposed to account for the marked increase in coke formation in the presence of oxygenated molecules in the reacting feed: (i) the conventional cracking route for the VGO fossil hydrocarbons leading to essentially graphitic coke deposited preferentially in the USY zeolite micropores, and (ii) the conversion of lignin fragments into hydrocarbons, residual light oxygenates (essentially phenolic type) and finally “bio-coke” which accumulates in mesopores as less structured coke as compared to the harder coke issued from hydrocarbons condensation. These two routes which are monitored by the catalysts structure, texture and acidity are strongly interacting via hydrogen transfer between light hydrocarbons and phenolic type fragments. A tentative mechanistic scheme is proposed.

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Keywords
FCC; Co-processing; Coke chemistry; Bio-oils; Vacuum gas oil cracking; Ultrastabilized Y zeolite
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Coke chemistry under vacuum gasoil/bio-oil FCC co-processing conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 257, Part 2, 15 November 2015, Pages 200–212
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