Heterogeneous catalyst, preparation method and application of heterogeneous catalyst in catalyzing isomerization of glucose into fructose

Abstract

The invention discloses a heterogeneous catalyst and a preparation method and an application of the heterogeneous catalyst in catalysis of isomerization of glucose into fructose, and the heterogeneous catalyst is prepared by the following steps: uniformly mixing 40-80mg of activated metal organic framework material powder and 4mL of 0.01-1M Lewis acid metal ion solution according to a ratio, reacting for 8-12 hours at 80-120 DEG C, washing and drying to obtain the heterogeneous catalyst. The heterogeneous catalyst is applied to catalysis of isomerization of glucose into fructose. The heterogeneous catalyst loaded with the Lewis acid metal sites is successfully prepared. The heterogeneous catalyst prepared by the method has the catalytic effect that the fructose yield reaches 20.09% or above, the selectivity reaches 73.21% or above, and the catalytic effect is improved. The heterogeneous catalyst disclosed by the invention has the characteristics of stability, easiness in separation and high repeatability, so that the heterogeneous catalyst becomes a better choice for replacing a biological enzyme and a homogeneous catalyst.

Description

technical field [0001] The invention belongs to the field of new materials, and specifically relates to a heterogeneous catalyst, a preparation method and an application in catalyzing the isomerization of glucose into fructose. Background technique [0002] Biomass energy is renewable and extensive, and has a very bright prospect in replacing fossil energy as the main energy consumption. The transformation of biomass resources into value-added chemicals such as biofuels and polymers can be achieved through "platform compounds", which include C6 sugars (glucose and fructose) and C5 sugars (xylose, etc.). Although glucose, like fructose, can be dehydrated to generate 5-HMF and other important chemical raw materials, its conversion efficiency is not as good as fructose, and the catalytic conditions are more stringent (fructose dehydration can even be carried out without a catalyst). Therefore, compared with the two, fructose is more suitable as a chemical raw material to prepa...

AI Technical Summary

Problems solved by technology

Although the bioenzyme-catalyzed process is highly selective, it has the following disadvantages: greatly increased processing costs, the use of buffer solutions to maintain pH; a narrow range of operating temperatures; strict purity requirements for reactants; and Due to the irreversible inactivation of the enzyme, the enzyme needs to be replaced periodically, etc.

At the same time, homogeneous acids or bases have the limitations of low selectivity, difficult separation and low reproducibility

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