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Effect of operating conditions on the coke nature and HZSM-5 catalysts deactivation in the transformation of crude bio-oil into hydrocarbons

Paper ID Volume ID Publish Year Pages File Format Full-Text
55136 47041 2012 8 PDF Available
Title
Effect of operating conditions on the coke nature and HZSM-5 catalysts deactivation in the transformation of crude bio-oil into hydrocarbons
Abstract

A study has been carried out on the effect of operating conditions (bio-oil/methanol ratio in the feed, temperature) on the deactivation of HZSM-5 catalysts used in the production of hydrocarbons by catalytic conversion of crude bio-oil continuously fed into a fluidized bed reactor. The bio-oil to be fed into the reactor has previously been subjected to an on-line thermal transformation in which the pyrolytic lignin derivatives have been re-polymerized. The coke deposited on the catalyst has been studied using different analytical techniques (FTIR spectroscopy, MS/FTIR-TPO, 13C CP-MAS NMR spectroscopy). The results evidence a direct relationship between coke deposition and deactivation and the concentration of bio-oil oxygenates in the reaction medium. Consequently, bio-oil conversion should be promoted in order to mitigate coke deposition. This is achieved using a HZSM-5 zeolite catalyst with a reduced SiO2/Al2O3 ratio and increasing reaction temperature and methanol/bio-oil ratio in the feed. The acidity of the HZSM-5 zeolite also has an influence on the nature of the coke, given that it contributes to increasing coke condensation towards polycondensed aromatic structures, although this has a minor effect on bio-oil conversion decrease with time on stream. The results obtained evidence the interest of the initiatives for co-feeding bio-oil with methanol to obtain hydrocarbons.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (263 K)Download as PowerPoint slideHighlights► Thermal and catalytic processes in-line for the upgrading of bio-oil on HZSM-5 catalysts. ► The coke is deposited heterogeneously inside and outside the zeolite crystals. ► The deactivation is less pronounced with the less acidic catalyst. ► The higher coke content is explained by the higher concentration of oxygenates and olefins. ► The increase in SiO2/Al2O3 ratio produced more aromatic and developed coke.

Keywords
Crude bio-oil; Methanol; Coke; Deactivation; Zeolite MFI
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Effect of operating conditions on the coke nature and HZSM-5 catalysts deactivation in the transformation of crude bio-oil into hydrocarbons
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 195, Issue 1, 15 November 2012, Pages 106–113
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us