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选用纤维二糖作为探针分子,探索纤维素催化转化制备乙二醇过程的反应路径.分别考察了纤维二糖和葡萄糖在双组分催化剂H2WO4和Ru/C下的催化反应活性.结果表明,乙二醇不仅来自于纤维二糖水解产物葡萄糖的逆羟醛缩合作用,同时也可以来自于纤维二糖的直接逆羟醛缩合过程.而且,纤维二糖的直接逆羟醛缩合作用对糖苷键的水解也有一定的促进作用.比较发现,钨基催化剂作用下纤维二糖的逆羟醛缩合反应活性比葡萄糖要低,因此乙醇醛可以缓慢产生并在Ru/C催化剂上迅速加氢生成乙二醇.使得以纤维二糖作为原料比以葡萄糖作为原料时获得更高的乙二醇收率.
The cellobiose was used as the probe molecule to explore the reaction pathway of cellulose conversion to ethylene glycol.The catalytic activity of cellobiose and glucose on two-component catalysts H2WO4 and Ru / C were investigated respectively.The results showed that, Ethylene glycol is not only derived from the inverse aldol condensation of the cellobiose hydrolyzate glucose, but also from the direct inverse aldol condensation of cellobiose, and the direct inverse aldol condensation of cellobiose affects the glycosidic bond Of the hydrolysis also has a certain role in promoting.Compared with the role of tungsten-based catalyst under the reaction of cellobiose inverse aldol reaction than glucose is low, so glycoal can be slowly produced and rapidly hydrogenated on the Ru / C catalyst to generate ethylene two The alcohol makes higher ethylene glycol yield obtained when cellobiose is used as a raw material than when glucose is used as a raw material.