College of Chemistry and Molecular Engineering, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, PR China.
Carbohydr Polym. 2013 Oct 15;98(1):146-51. doi: 10.1016/j.carbpol.2013.05.074. Epub 2013 Jun 4.
Sulfonated hierarchical H-USY zeolite was prepared and characterized by X-ray diffraction, N2 physisorption, Fourier transform infrared spectroscopy, inductively coupled plasma atomic emission spectroscopy, temperature-programmed desorption of ammonia, and acid-base titration. It was proved that sulfonic group was successfully anchored onto the hierarchical H-USY zeolite. The acidity of the hierarchical H-USY was remarkably improved. Sulfonated hierarchical H-USY zeolite was efficient for the hydrolysis of hemicellulose and cellulose. The yield of TRS for hydrolysis of hemicellulose reached 78.0% at 140 °C for 9h. For hydrolysis of α-cellulose, 60.8% conversion with 22.4% yield of glucose was obtained. Even for microcrystalline cellulose, 43.7% conversion with 15.1% yield of glucose can be obtained. These results are much higher than those obtained over hierarchical H-USY zeolite, indicating that both the acidity and the pore structure determine the activity of zeolite as catalyst in the hydrolysis of biomass.
磺化分级 H-USY 沸石通过 X 射线衍射、N2 物理吸附、傅里叶变换红外光谱、电感耦合等离子体原子发射光谱、氨程序升温脱附以及酸碱滴定进行了制备和表征。结果证明，磺酸基成功地锚定在分级 H-USY 沸石上。分级 H-USY 的酸度显著提高。磺化分级 H-USY 沸石对半纤维素和纤维素的水解具有很高的催化活性。在 140°C 下反应 9 小时，半纤维素水解的 TRS 产率达到 78.0%。对于α-纤维素，转化率为 60.8%，葡萄糖产率为 22.4%。即使对于微晶纤维素，也可以获得 43.7%的转化率和 15.1%的葡萄糖产率。这些结果明显高于在分级 H-USY 沸石上获得的结果，表明酸度和孔结构都决定了沸石作为催化剂在生物质水解中的活性。
