Reaction mechanism of starch hydrolysis over solid acid catalysts and its application for cellulose hydrolysis

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The mildly hydrothermal methods (below 180℃) using solid acid catalysts for the glucose production from cellulose can be one of key technologies for the future sustainable society. In this project, I studied the solid acid catalysis for the hydrolysis of soluble starch with (alfa)-1,4-glycosidic bonds and insoluble cellulose with (beta)-1,4-glycosidic bonds into glucose. Among the solid acid catalysts we tested, such as the H-form zeolite catalysts and the sulfated and sulfonated catalysts, a sulfonated activated-carbon (AC-SO_3H) catalyst show remarkably high yield of glucose, which is due to the high hydrothermal stability and the excellent catalytic property attributed to the strong acid sites of SO_3H functional groups. The catalytic hydrothermal methods using AC-SO_3H catalyst gave the highly selective glucose production from cellulose at 150℃.