Preparation method of high-activity catalyst used for catalyzing isomerization of glucose

Abstract

The invention discloses a preparation method of a high-activity catalyst used for catalyzing isomerization of glucose. The preparation method specifically comprises the steps that magnesium salt, niobium hydroxide and other active centers are evenly dispersed in a high-amylose hydrogel containing urea and thiourea, after freeze drying, high-temperature roasting is carried out under the inert gas atmosphere, and the MgO / Nb2O5 catalyst taking N and S doped activated carbon as a carrier is obtained. The catalyst can be uniformly dispersed in a solvent system, reduces the aggregation among the active centers, and can efficiently catalyze the glucose isomerization into fructose under the mild conditions. The provided catalyst has the advantages that the preparation process is simple, the catalytic efficiency is high, and reliable technical support is provided for the industrialized popularization of the high value-added fructose prepared by the glucose isomerization.

Description

technical field [0001] The invention relates to a preparation method of a highly efficient and heterogeneous catalyst capable of catalyzing the isomerization of glucose into fructose, belonging to the fields of industrial catalysis and biomass-based chemicals. Background technique [0002] 5-Hydroxymethylfurfural can be prepared by dehydration and decomposition of cheap and renewable six-carbon sugars, oligosaccharides, high polysaccharides, and even straw, bagasse, and corn cobs and other biomass raw materials under the action of catalysts. As a key bridge compound between bio-based sugar chemistry and petroleum-based chemistry, it can be used to synthesize many useful compounds to replace petroleum-based chemicals, and is used in fuels, medicines, new polymer materials, plastics, fuel additives things etc. In recent years, the research on the catalytic conversion of biomass six-carbon sugars to prepare 5-hydroxymethylfurfural and the downstream conversion and utilization ...

AI Technical Summary

Problems solved by technology

However, due to the disadvantages of poor stability and long reaction time of biological enzymes to catalyze isomerase activity, a large number of scientific researchers have begun to study low-cost, easy-to-operate chemically catalyzed glucose isomerization technology.

[0007] MgO is another cheap and efficient alkaline catalyst, which can realize the isomerization of glucose into fructose under low temperature conditions. By changing the morphology and pore structure of MgO, the amount of alkali can be adjusted. After reacting in 90°C aqueous solution for 45 minutes, glucose Conversion rate and fructose selectivity are 44.1% and 75.8% respectively, a small amount of CaO impurity that exists in natural MgO can increase the alkali amount of catalyst and can effectively improve the conversion rate of glucose, but fructose selectivity then declines to some extent (Asimina A Marianou, Chrysoula M Michailof, Dimitrios K Ipsakis, Stamatia A Karakoulia, KonstantinosG Kalogiannis, Haris Yiannoulakis, Konstantinos S Triantafyllidis, A ALappas. Isomerization of glucose into fructose over natural and synthetic MgOcatalysts[J].ACS Sustainable Chemistry,(2) 16459–16470.)

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