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

Energies

Masahide Yasuda¹  Ryo Kurogi¹  Hikaru Tsumagari¹  Tsutomu Shiragami¹ 

[1] Department of Applied Chemistry, Faculty of Engineering, University of Miyazaki, Gakuen-Kibanadai Nishi, Miyazaki 889-2192, Japan; E-Mails:

关键词: bamboo;    rice straw;    silvergrass;    cellulase;    xylanase;    simultaneous saccharification and fermentation (SSF);    hydrogen-evolution;    Pt-loaded TiO₂;   

DOI  :  10.3390/en7074087

来源: mdpi

【 摘 要 】

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).

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.