Preparation of rare earth phosphate and application of rare earth phosphate in catalyzing biomass sugar to synthesize 5-HMF (5-hydroxymethylfurfural)

Abstract

The invention discloses a series of rare earth phosphates and application thereof in catalyzing biomass sugar to synthesize 5-HMF (5-hydroxymethylfurfural). Accordingly, the inventor also establishes a preparation method of the corresponding rare earth phosphate, and the rare earth phosphate is synthesized by taking rare earth metal nitrate or rare earth metal chloride and NH4H2PO4 as raw materials and adopting a hydrothermal method or a coprecipitation method. Rare earth metal cations in the rare earth phosphate solid acid are Lewis acid sites, so that the isomerization rate-limiting step of biomass sugars such as glucose is promoted; the P-OH group on the surface provides # imgabs0 # acid sites, the continuous dehydration reaction of fructose is accelerated, and high-yield and high-selectivity preparation of 5-HMF is realized. The preparation method disclosed by the invention has the advantages of economy, high efficiency, environment friendliness, easiness in post-treatment and the like. The obtained double-acid rare earth phosphate solid acid has good and even excellent catalytic activity on biomass sugars such as various monosaccharides, disaccharides and polysaccharides. Under mild optimized reaction conditions, efficient catalytic conversion of various biomass sugars can be realized, and the catalyst is good in cycling stability and has a good industrial prospect.

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