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Energies 2014, 7(7), 4087-4097; doi:10.3390/en7074087

New Approach to Fuelization of Herbaceous Lignocelluloses through Simultaneous Saccharification and Fermentation Followed by Photocatalytic Reforming

1
Department of Applied Chemistry, Faculty of Engineering, University of Miyazaki, Gakuen-Kibanadai Nishi, Miyazaki 889-2192, Japan
2
Center for Collaborative Research and Community Cooperation, University of Miyazaki, Gakuen-Kibanadai Nishi, Miyazaki 889-2192, Japan
*
Author to whom correspondence should be addressed.
Received: 1 May 2014 / Revised: 13 June 2014 / Accepted: 19 June 2014 / Published: 26 June 2014
(This article belongs to the Special Issue Advances and Challenges in Cellulosic Ethanol)
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Abstract

Bio-fuelization of herbaceous lignocelluloses through a simultaneous saccharification and fermentation process (SSF) and photocatalytic reforming (photo-Reform) was examined. The SSF of the alkali-pretreated bamboo, rice straw, and silvergrass was performed in an acetate buffer (pH 5.0) using cellulase, xylanase, and Saccharomyces cerevisiae at 34 °C. Ethanol was produced in 63%–85% yields, while xylose was produced in 74%–97% yields without being fermented because xylose cannot be fermented by S. cerevisiae. After the removal of ethanol from the aqueous SSF solution, the SSF solution was subjected to a photo-Reform step where xylose was transformed into hydrogen by a photocatalytic reaction using Pt-loaded TiO2 (2 wt % of Pt content) under irradiation by a high pressure mercury lamp. The photo-Reform process produced hydrogen in nearly a yield of ten theoretical equivalents to xylose. Total energy was recovered as ethanol and hydrogen whose combustion energy was 73.4%–91.1% of that of the alkali-pretreated lignocelluloses (holocellulose).
Keywords: bamboo; rice straw; silvergrass; cellulase; xylanase; simultaneous saccharification and fermentation (SSF); hydrogen-evolution; Pt-loaded TiO2 bamboo; rice straw; silvergrass; cellulase; xylanase; simultaneous saccharification and fermentation (SSF); hydrogen-evolution; Pt-loaded TiO2
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Yasuda, M.; Kurogi, R.; Tsumagari, H.; Shiragami, T.; Matsumoto, T. New Approach to Fuelization of Herbaceous Lignocelluloses through Simultaneous Saccharification and Fermentation Followed by Photocatalytic Reforming. Energies 2014, 7, 4087-4097.

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