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Catalytic hydroprocessing of lignin under thermal and ultrasound conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
55334 47048 2012 8 PDF Available
Title
Catalytic hydroprocessing of lignin under thermal and ultrasound conditions
Abstract

Lignin isolated from Miscanthus × giganteus using acidic (FAL) and basic (AL) conditions was thereafter subjected to catalytic depolymerization under thermal or ultrasonic activation. The characterization of lignin samples was achieved by thermogravimetric analysis and FTIR. Three different classes of catalysts containing nickel as the active species have been prepared in this respect: (i) nano-Ni(0) by reduction of NiCl2 with NaBH4 under ultrasonication, (ii) Fe3O4–(NiMgAlO)x and (NiAlO)x by calcination of Mg(Ni)–Al hydrotalcite incorporating Fe3O4, followed by reduction with hydrogen, and (iii) NiO(1 1 1) nanosheets by reduction of Ni(NO3)2 with urea using benzyl alcohol as a structure directing agent. The catalysts were characterized by XRD and XPS techniques. Reduced mixed oxides displayed a moderate activity while a significant increase in conversion (up to 90%) was observed with nano-Ni(0) and NiO(1 1 1) nanosheets catalysts. The conversion and the mass distribution of the reaction products were strongly related to the procedure used for the extraction of lignin. In all the reactions AL samples had a greater extent of depolymerization. The performance from the tested catalysts under ultrasonic conditions was inferior to those tested under conventional heating conditions. The nature of the solvent was also found to be very important to this process, with the ionic liquid, 1-butyl-3-methylimidazolium acetate ([BMIM]OAc) demonstrating the best results in autoclave conditions and methanol under ultrasonic conditions.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (160 K)Download as PowerPoint slideHighlights► Lignin isolated from Miscanthus × giganteus using acidic and basic conditions. ► Catalytic depolymerization under thermal activation. ► Catalytic depolymerization under ultrasonic activation. ► NiO(1 1 1) nanosheet catalysts. ► Fe3O4–(NiMgAlO)x and (NiAlO)x prepared by calcination of Mg(Ni)–Al hydrotalcite.

Keywords
Lignin; Alkaline treatment; Acidic treatment; Depolymerization; Nano-catalysts; Low-molecular compounds
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 196, Issue 1, 30 November 2012, Pages 3–10
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