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Hydrogen production from cellulose, lignin, bark and model carbohydrates in supercritical water using nickel and ruthenium catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46385 46438 2012 9 PDF Available
Title
Hydrogen production from cellulose, lignin, bark and model carbohydrates in supercritical water using nickel and ruthenium catalysts
Abstract

In this study, the catalytic activity and hydrogen selectivity of Ni/α-Al2O3, Ni/hydrotalcite, Raney nickel, Ru/C and Ru/γ-Al2O3 catalysts for hydrothermal hydrogen production from lignocellulosic biomass have been evaluated. The feedstocks included glucose, cellulose, fructose, xylan, pulp, lignin and bark. The experiments were carried out at 380 °C in a batch reactor with 2 wt% feed concentration. It was found that the gasification of glucose, fructose, cellulose, xylan and pulp resulted in comparable gas yields (±10% at 60 min), whereas lignin was substantially harder to gasify. Interestingly, gasification yield of bark which has a high lignin content was comparable to those of carbohydrates after 60 min reaction time. For a given feedstock, catalyst type affected both the gasification yield and the product distribution. Ni/α-Al2O3 and Ni/hydrotalcite catalysts were not only highly active for the gasification of carbohydrates, but also had better hydrogen selectivity when compared to Raney nickel, Ru/C and Ru/γ-Al2O3. In particular, gasification of bark in the presence of these catalysts resulted in negligible amounts of alkanes.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Supported nickel catalysts had a high hydrogen selectivity. ► Ru/C was found to be more active than Ru/γ-Al2O3. ► Metal dispersion significantly affected the methane formation rate.

Keywords
Supercritical water gasification; Catalyst; Biomass; Model compounds; Hydrogen
First Page Preview
Hydrogen production from cellulose, lignin, bark and model carbohydrates in supercritical water using nickel and ruthenium catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 117–118, 18 May 2012, Pages 330–338
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis