In-situ Upgrading of Napier Grass Pyrolysis Vapour Over Microporous and Hierarchical Mesoporous Zeolites

This study presents in-situ upgrading of pyrolysis vapour derived from Napier grass over microporous and mesoporous ZSM-5 catalysts. It evaluates effect of process variables such catalyst–biomass ratio and catalyst type in a vertical fixed bed pyrolysis system at 600 °C, 50 °C/min under 5 L/min nitr...

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Bibliographic Details
Published in:Waste and biomass valorization 2018-08, Vol.9 (8), p.1415-1428
Main Authors: Mohammed, Isah Yakub, Abakr, Yousif Abdalla, Kazi, Feroz Kabir
Format: Article
Language:English
Subjects:
Alkanes
Alkenes
Aromatic compounds
Biomass
Catalysis
Catalysts
Deoxygenation
Engineering
Environment
Environmental Engineering/Biotechnology
Fixed beds
Grasses
Hydrocarbons
Industrial Pollution Prevention
Oil
Original Paper
Phenols
Physicochemical properties
Polycyclic aromatic hydrocarbons
Process variables
Pyrolysis
Renewable and Green Energy
Solvents
Upgrading
Vapors
Waste Management/Waste Technology
Zeolites
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Summary:This study presents in-situ upgrading of pyrolysis vapour derived from Napier grass over microporous and mesoporous ZSM-5 catalysts. It evaluates effect of process variables such catalyst–biomass ratio and catalyst type in a vertical fixed bed pyrolysis system at 600 °C, 50 °C/min under 5 L/min nitrogen flow. Increasing catalyst–biomass ratio during the catalytic process with microporous structure reduced production of organic phase bio-oil by approximately 7.0 wt%. Using mesoporous catalyst promoted nearly 4.0 wt% higher organic yield relative to microporous catalyst, which translate to only about 3.0 wt% reduction in organic phase compared to the yield of organic phase from non-catalytic process. GC–MS analysis of bio-oil organic phase revealed maximum degree of deoxygenation of about 36.9% with microporous catalyst compared to the mesoporous catalysts, which had between 39 and 43%. Mesoporous catalysts promoted production olefins and alkanes, normal phenol, monoaromatic hydrocarbons while microporous catalyst favoured the production of alkenes and polyaromatic hydrocarbons. There was no significant increase in the production of normal phenols over microporous catalyst due to its inability to transform the methoxyphenols and methoxy aromatics. This study demonstrated that upgrading of Napier grass pyrolysis vapour over mesoporous ZSM-5 produced bio-oil with improved physicochemical properties.
ISSN:1877-2641
1877-265X
DOI:10.1007/s12649-017-9925-x