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Catalytic upgrading of biomass pyrolysis vapors using transition metal-modified ZSM-5 zeolite

Paper ID Volume ID Publish Year Pages File Format Full-Text
46287 46436 2012 10 PDF Available
Title
Catalytic upgrading of biomass pyrolysis vapors using transition metal-modified ZSM-5 zeolite
Abstract

The main objective of the present work was the study of different ZSM-5 catalytic formulations for the in situ upgrading of biomass pyrolysis vapors. An equilibrium, commercial diluted ZSM-5 catalyst was used as the base case, in comparison with a series of nickel (Ni) and cobalt (Co) modified variants at varying metal loading (1–10 wt.%). The product yields and the composition of the produced bio-oil were significantly affected by the use of all ZSM-5 catalytic materials, compared to the non-catalytic flash pyrolysis, producing less bio-oil but of better quality. Incorporation of transition metals (Ni or Co) in the commercial equilibrium/diluted ZSM-5 catalyst had an additional effect on the performance of the parent ZSM-5 catalyst, with respect to product yields and bio-oil composition, with the NiO modified catalysts being more reactive towards decreasing the organic phase and increasing the gaseous products, compared to the Co3O4 supported catalysts. However, all the metal-modified catalysts exhibited limited reactivity towards water production, while simultaneously enhancing the production of aromatics and phenols. An interesting observation was the in situ reduction of the supported metal oxides during the pyrolysis reaction that eventually led to the formation of metallic Ni and Co species on the catalysts after reaction, which was verified by detailed XRD and HRTEM analysis of the used catalysts. The Co3O4 supported ZSM-5 catalysts exhibited also a promising performance in lowering the oxygen content of the organic phase of bio-oil.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ni or Co/ZSM-5 catalysts for the in situ upgrading of biomass pyrolysis vapors. ► Produced bio-oil is enriched in aromatics and phenols and is less oxygenated. ► Reduced metallic Ni and Co species are formed during the pyrolysis reaction. ► Reduced metal phases can favor hydrogen transfer reactions during pyrolysis. ► Enhanced (de)hydrogenation reactions favor production of light alkanes & aromatics.

Keywords
Lignocellulosic wood biomass; Catalytic biomass flash pyrolysis; Bio-oil; Zeolites; Transition metals; Nickel; Cobalt
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Catalytic upgrading of biomass pyrolysis vapors using transition metal-modified ZSM-5 zeolite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 127, 30 October 2012, Pages 281–290
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