The catalytic behavior of a series of MFI catalysts with different Si/Al ratio (25–300) in the direct aqueous-phase hydrolysis of α-cellulose was studied. The effects ultrasonic pretreatment time, ZnCl₂ content, zeolite pore structure and acid-basic properties on catalyst activity and products distribution were systematically investigated. The results indicated that HZSM-5 with lower Si/Al ratio was beneficial for production of glucose and LA from α-cellulose. Ultrasonic pretreatment could decrease the degree of crystallinity and polymerization of α-cellulose, enhance the accessibility of acid sites and ZnCl₂ to the loosened amorphous regions of α-cellulose in water, and improve the hydrolysis efficiency of α-cellulose. The desilicated ZSM-5 (HZSM-5-DS(0.2)) showed much higher catalytic activities as compared to commercial ZSM-5 and α-cellulose conversion reached 76.5% over HZSM-5-DS(0.2) at 200 °C. Catalytic conversion of α-cellulose consisted of at least three important parallel reactions under the present hydrothermal conditions and a plausible pathway was proposed. Effective control of these reactions would be helpful to further maximize the target product yield during the catalytic conversion of α-cellulose.

研究了一系列不同硅/铝比（25-300）的MFI催化剂在α-纤维素直接水相水解中的催化行为。系统研究了超声预处理时间，ZnCl ₂含量，沸石孔结构和酸碱性质对催化剂活性和产物分布的影响。结果表明，具有较低Si / Al比的HZSM-5有利于由α-纤维素生产葡萄糖和LA。超声预处理可降低α-纤维素的结晶度和聚合度，增强酸位和ZnCl ₂的可及性在水中α-纤维素的疏松无定形区域，并提高了α-纤维素的水解效率。与市售ZSM-5相比，脱硅酸盐的ZSM-5（HZSM-5-DS（0.2））表现出更高的催化活性，在200°C时，α-纤维素转化率比HZSM-5-DS（0.2）达到76.5％。在目前的水热条件下，α-纤维素的催化转化反应至少由三个重要的平行反应组成，并提出了一条可行的途径。对这些反应的有效控制将有助于在α-纤维素催化转化过程中进一步最大化目标产物的收率。