Cellobiose hydrolysis using organic–inorganic hybrid mesoporous silica catalysts
- 作者：Jason A. Bootsma ; Brent H. Shanks
- 关键词：Cellobiose ; Disaccharide hydrolysis ; Organic– ; inorganic hybrid catalysts ; Mesoporous silica ; Corn fiber
- 刊名：Applied Catalysis A ; General
- 出版年：2007
- 期刊代码：4_0926860x
- 类别：ch
- 出版时间：31 July 2007
- 卷：327
- 期：1
- 页码：44-51
- 文件大小：469 K
摘要
The hydrolysis of cellobiose, a model system for oligosaccharide hydrolysis, was examined using organic–inorganic hybrid mesoporous catalysts. The activity of butylcarboxylic acid, propylsulfonic acid and arenesulfonic acid functionalized silicas were determined for cellobiose hydrolysis as well as glucose degradation. The hydrolysis rate constants for the three catalyst types were proportional to their pH values at ambient temperature and the apparent activation energies for the hydrolysis reaction were the same suggesting that hydrated protons were the catalytic species in the reaction. The apparent activation energy for glucose degradation was the same for each of the catalysts and was lower than that found for the hydrolysis reaction. As such, higher reaction temperature improved the selectivity of the hydrolysis reaction relative to the degradation reaction. The desirability of high reaction temperatures made the organic–inorganic hybrid materials preferable to polymer-based catalysts.