Preparation method and application of calcium-magnesium double active center catalyst

Abstract

The invention discloses a preparation method and application of a calcium-magnesium double active center catalyst. The preparation method of the calcium-magnesium double active center catalyst comprises the steps that in particular, a crustacean shell and a magnesium hydroxide emulsion are used as raw materials, through the process of protein removing by enzymatic hydrolysis, gelation and high-temperature roasting, the highly dispersed MgO / CaO double active center catalyst using N-doped porous carbon as a carrier is obtained. A Ca element based on active centers is magnesium which is naturallypresent in the crustacean shell and the magnesium hydroxide emulsion and is present as ultrafine particles, and the active centers in the prepared catalyst can be uniformly dispersed in the porous carbon carrier, the catalyst has excellent catalytic activity for isomerization of glucose to fructose and the decomposition preparation of sucrose to fructose. The catalyst is simple in preparation process, high in catalytic efficiency and easy to promote.

Description

technical field [0001] The invention relates to a preparation method of a high-efficiency, heterogeneous calcium-magnesium dual-active center catalyst capable of catalyzing the isomerization of glucose into fructose and the conversion of sucrose 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, many fine chemicals, medical supplies and macrocyclic compounds can be synthesized based on it, and can be further aldolized and hydrogenated to form a liquid Fuel; As a monomer, new polymer materials with optical activity and biodegradable properties can be synthesized. ...

AI Technical Summary

Problems solved by technology

MgO is another cheap and efficient alkaline catalyst, which can realize the isomerization of glucose to 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, StamatiaA Karakoulia, Konstantinos G Kalogiannis, Haris Yiannoulakis, Konstantinos STriantafyllidis, A A Lappas. Isomerization of glucose into fructose overnatural and synthetic MgO catalysts[J].ACS Sustainable198ineeringry,6&Eng –16470.)

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