Mesoporous ZSM-5 prepared by alkaline treatment was demonstrated as an efficient catalyst for the cellulose hydrolysis in ionic liquid (IL), affording a high yield of reducing sugar. It was demonstrated that mesoporous ZSM-5 (SiO2/Al2O3 = 38) had 76.2% cellulose conversion and 49.6% yield of total reducing sugar (TRS). In comparison, the conventional ZSM-5 had a mere 41.3% cellulose conversion with 33.2% yield of TRS. The results indicated that the important role of mesopores in zeolites in elevating the TRS yield may be due to the diffusional alleviation of cellulose macromolecules. The effects of reaction time, temperature, and the ratio of catalyst to cellulose were investigated for optimal reaction conditions. It was found that IL could enter the inner channel of mesoporous ZSM-5 to promote the generation of H+ from Brönsted acid sites, which facilitated hydrolysis. Moreover, the mesoporous ZSM-5 showed excellent reusability for catalytic cycles by means of calcination of the used one, promising for its practical applications in the hydrolysis of cellulose.
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机译：通过碱性处理制备的中孔ZSM-5被证明为离子液体（IL）中的纤维素水解的有效催化剂，得到高产的还原糖。据证明，中孔ZSM-5（SiO 2 / Al 2 O 3 = 38）具有76.2％的纤维素转化率和总还原糖的49.6％的产率（TRS）。相比之下，传统的ZSM-5仅具有41.3％的纤维素转化率，其TRS的33.2％。结果表明，中孔在沸石中升高TRS产量的重要作用可能是由于纤维素大分子的扩散缓解。研究了反应时间，温度和催化剂与纤维素的比率的影响，以获得最佳的反应条件。发现IL可以进入中孔ZSM-5的内部通道，以促进Brönsted酸部位的H +的产生，促进水解。此外，中孔ZSM-5通过煅烧使用的煅烧催化循环对催化循环的优异可重用性，很有希望其在纤维素水解中的实际应用。
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