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

Abstract

The invention discloses a preparation method and application of a calcium-magnesium double-active center catalyst. Specifically, crustacean shells and magnesium hydroxide emulsion are used as raw materials, and the highly dispersed N‑doped porous carbon-supported MgO / CaO dual-site catalysts. The Ca element based on the active center is naturally present in the crustacean shell and the magnesium in the magnesium hydroxide emulsion exists in ultrafine particles, and the active center in the prepared catalyst can be uniformly dispersed in the porous carbon carrier, and the catalyst is effective for glucose isotropic The reaction of fructose into fructose and the decomposition of sucrose into fructose showed excellent catalytic activity. The catalyst provided by the invention has simple preparation process, high catalytic efficiency and easy popularization.

Description

Technical field [0001] The present invention relates to a catalytic glucose isomerization into fructose, sucrose into fructose efficient, heterogeneous calcium and magnesium dual active center catalyst preparation method, belongs to the field of industrial catalysis and biomass-based chemicals. Background [0002] 5-Hydroxymethylfural can be prepared by dehydration decomposition of biomass raw materials such as inexpensive, renewable hexacarbon sugar, oligosaccharides, hypersaccharides, and even straw, bagasse, and corn cobs under the action of catalysts, and is internationally regarded as a key bridge compound between bio-based glycosaccharide chemistry and petroleum-based chemistry, based on which many fine chemicals, medical supplies and macrocyclic compounds can be synthesized, and can also be further hydroxyaldehyde condensation and hydrogenation to generate liquid fuels; as a monomer can be synthesized with optical activity, A new polymer material with biodegradable proper...

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, Stamatia A Karakoulia, Konstantinos G Kalogiannis, Haris Yiannoulakis, Konstantinos STriantafyllidis, A A Lappas. Isomerization of glucose into fructose overnatural and synthetic MgO catalysts[J]. –16470.)

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