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Catalytic hydrolysis of cellulose to reducing sugar over acid-activated montmorillonite catalysts
Abstract The hydrolysis of cellulose to reducing sugar in water solution over a series of solid catalysts was studied, including the H-form zeolite, montmorillonite, and acid-activated montmorillonite. The acid-activated montmorillonite and the solid reaction products were characterized by using X-ray diffraction, Fourier transform-infrared spectroscopy, scanning electron microscopy and thermal analysis. The Brøsted-acid sites of the acid-activated montmorillonite were determined. The optimum reaction time and temperature of hydrolysis were also investigated over acid-activated montmorillonite catalysts. Among the solid acid catalysts tested, acid-activated montmorillonite catalysts showed higher catalytic activity. The montmorillonite treated by H2SO4 had a higher conversion of cellulose up to 91.2%, while the montmorillonite treated by 10% H3PO4 showed a higher yield of reducing sugar of 16.9%. Anions adsorbed on montmorillonite increased the yield of reducing sugar and PO4 3− ions probably played a role in the formation of reducing sugar. The characterization results showed that acid activation had little influence on the layered structure of montmorillonite. The crystalline structure of cellulose was almost destroyed at 473K.
Graphical abstract The performances of acid-activated montmorillonite catalysts made from treatment by H2SO4, H3PO4 and p-toluenesulfonic acid in the catalytic hydrolysis of cellulose to reducing sugar were preliminarily investigated. Display Omitted Highlights ► Catalytic hydrolysis of cellulose over activated montmorillonite catalysts. ► Increasing the amount of acid sites enhanced the conversion of cellulose. ► Anion ions adsorbed on montmorillonite affected the yield of reducing sugaring. ► Presence of PO4 3– ions contributed to formation of reducing sugar. ► The crystalline structure of cellulose was disrupted at elevated temperature.
Catalytic hydrolysis of cellulose to reducing sugar over acid-activated montmorillonite catalysts
Abstract The hydrolysis of cellulose to reducing sugar in water solution over a series of solid catalysts was studied, including the H-form zeolite, montmorillonite, and acid-activated montmorillonite. The acid-activated montmorillonite and the solid reaction products were characterized by using X-ray diffraction, Fourier transform-infrared spectroscopy, scanning electron microscopy and thermal analysis. The Brøsted-acid sites of the acid-activated montmorillonite were determined. The optimum reaction time and temperature of hydrolysis were also investigated over acid-activated montmorillonite catalysts. Among the solid acid catalysts tested, acid-activated montmorillonite catalysts showed higher catalytic activity. The montmorillonite treated by H2SO4 had a higher conversion of cellulose up to 91.2%, while the montmorillonite treated by 10% H3PO4 showed a higher yield of reducing sugar of 16.9%. Anions adsorbed on montmorillonite increased the yield of reducing sugar and PO4 3− ions probably played a role in the formation of reducing sugar. The characterization results showed that acid activation had little influence on the layered structure of montmorillonite. The crystalline structure of cellulose was almost destroyed at 473K.
Graphical abstract The performances of acid-activated montmorillonite catalysts made from treatment by H2SO4, H3PO4 and p-toluenesulfonic acid in the catalytic hydrolysis of cellulose to reducing sugar were preliminarily investigated. Display Omitted Highlights ► Catalytic hydrolysis of cellulose over activated montmorillonite catalysts. ► Increasing the amount of acid sites enhanced the conversion of cellulose. ► Anion ions adsorbed on montmorillonite affected the yield of reducing sugaring. ► Presence of PO4 3– ions contributed to formation of reducing sugar. ► The crystalline structure of cellulose was disrupted at elevated temperature.
Catalytic hydrolysis of cellulose to reducing sugar over acid-activated montmorillonite catalysts
Tong, Dong Shen (Autor:in) / Xia, Xi (Autor:in) / Luo, Xi Ping (Autor:in) / Wu, Lin Mei (Autor:in) / Lin, Chun Xiang (Autor:in) / Yu, Wei Hua (Autor:in) / Zhou, Chun Hui (Autor:in) / Zhong, Zhe Ke (Autor:in)
Applied Clay Science ; 74 ; 147-153
02.09.2012
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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