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Title: Catalytic gasification of wheat straw in hot compressed (subcritical and supercritical) water for hydrogen production
Authors: Nanda S.
Reddy, Sivamohan N.
Vo D.-V.N.
Sahoo B.N.
Kozinski J.A.
Published in: Energy Science and Engineering
Abstract: To supplement the increasing energy demands and cope with the greenhouse gas emissions, biofuels generated from lignocellulosic biomass are gaining widespread attention. In this study, wheat straw was used as a candidate lignocellulosic biomass to produce hydrogen fuel through hydrothermal gasification. The fluid phases of water investigated for gasification included subcritical (300 and 370°C) and supercritical (450 and 550°C) phases. Along with the effects of temperature (300-550°C), the influences of feed concentration (20-35 wt%) and reaction time (40-70 minutes) were comprehensively studied for wheat straw gasification in subcritical and supercritical water. To maximize hydrogen and total gas yields, the effects of two metal catalysts (eg, Ru/Al2O3 and Ni/Si-Al2O3) were examined. Hydrogen and total gas yields, as well as lower heating values of the gas products, were comparatively evaluated during the subcritical and supercritical water gasification of wheat straw. Supercritical water gasification of wheat straw at 550°C with 20 wt% feed concentration for 60 minutes of reaction time resulted in higher yields of hydrogen (2.98 mmol/g) and total gases (10.6 mmol/g). When compared to noncatalytic gasification, catalytic gasification using 5 wt% loading of Ru/Al2O3 and Ni/Si-Al2O3 enhanced the hydrogen yields up to 4.18 and 5.1 mmol/g, respectively, along with respective total gas yields of 15 and 18.2 mmol/g. Nonetheless, wheat straw-derived biochar produced at high supercritical water temperatures also retained high carbon content and calorific value. © 2018 The Authors. Energy Science & Engineering published by the Society of Chemical Industry and John Wiley & Sons Ltd.
Citation: Energy Science and Engineering (2018), 6(5): 448-459
Issue Date: 2018
Publisher: John Wiley and Sons Ltd
Keywords: catalyst
subcritical water
supercritical water
wheat straw
ISSN: 20500505
Author Scopus IDs: 56350215900
Author Affiliations: Nanda, S., Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, Canada
Reddy, S.N., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
Vo, D.-V.N., Faculty of Chemical and Natural Resources Engineering, Universiti Malaysia Pahang, Gambang, Pahang, Malaysia
Sahoo, B.N., Department of Mechanical Engineering, York University, Toronto, ON, Canada
Kozinski, J.A., New Model in Technology and Engineering, Hereford, Herefordshire, United Kingdom
Funding Details: Natural Sciences and Engineering Research Council of Canada (NSERC)
Corresponding Author: Kozinski, J.A.; New Model in Technology and EngineeringUnited Kingdom; email:
Appears in Collections:Journal Publications [CH]

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