固体酸的比表面积对纤维二糖水解活性的影响

Effect of specific surface area of solid acid on hydrolysis activity of cellobiose

通过调控聚合物固体酸(HCPSA)的磺化条件制备了与碳基固体酸(CCSA)活性基团(—SO_(3)H)密度相同、比表面积不同的HCPSA,利用比表面积及孔径分析、XRD、FT-IR、XPS等手段对CCSA和HCPSA的结构进行表征,并将其用于催化纤维二糖的水解,研究了固体酸的比表面积对纤维二糖水解的影响。结果表明,HCPSA的催化效果明显好于CCSA。虽然CCSA比HCPSA的总酸密度高,但HCPSA中大的比表面积对HCPSA的催化活性具有促进作用。

HCPSA,a polymer solid acid,is prepared by adjusting sulfonation conditions.HCPSA has the same density as carbon-based solid acid(CCSA)sulfonic acid group(—SO_(3)H)but has different specific surface area from the latter.The structure of CCSA and HCPSA is characterized by means of specific surface area analysis,pore size analysis,XRD,FT-IR,XPS and other methods.CCSA and HCPSA are respectively used to catalyze the hydrolysis of cellobiose,and the effect of specific surface area of solid acid on the hydrolysis of cellobiose Is studied.The results show that HCPSA performs significantly better catalytic effect than CCSA.CCSA has a higher total acid density than HCPSA,but HCPSA contains a large specific surface area.Although CCSA has a higher total acid density,HCPSA can promote the catalytic activity by relying on its larger specific surface area.