Metal-solid acid double-center catalyst and application thereof in catalyzing dehydration-hydrogenation of xylose to prepare furfuryl alcohol

Abstract

The invention discloses a metal-solid acid double-center catalyst and an application thereof in catalyzing dehydration-hydrogenation of xylose to prepare furfuryl alcohol. The catalyst comprises an acid center and a metal center, the acid center is sulfonated and modified graphene with a two-dimensional planar structure, and the metal center is metal Ru with higher C=O-based hydrogenation activity. The loading capacity of the metal in the catalyst is 0.5 wt%-5wt%, and the mass percent of the sulfonated graphene is 95%-99.5%. The used metal-solid acid double-center catalyst shows excellent catalytic performance in catalyzing xylose to directly prepare furfuryl alcohol through a dehydration-hydrogenation one-step method; effective coupling of acid catalysis and hydrogenation reaction is realized, the economy and safety of the method are improved, the reaction is simple, the catalyst can be recycled, and the method has potential industrial application value.

Description

technical field [0001] The invention relates to a metal-solid acid double-center catalyst and its application in catalyzing the dehydration-hydrogenation of xylose to prepare furfuryl alcohol, which belongs to the technical field of catalyst preparation and application, and specifically relates to a method of using a high-efficiency metal-solid acid catalyst to catalyze xylose A method for directly preparing furfuryl alcohol through dehydration-hydrogenation reaction. Background technique [0002] Furfuryl alcohol is an important strategic chemical raw material and an important intermediate for the synthesis of polyester, furan resin, rocket fuel, fiber, spices, vitamin C and medicine. With the development of the national economy, the demand for furfuryl alcohol is large, and the current growth rate is 30% to 50%, and the price is expensive. Therefore, it is of great research significance and economic value to efficiently convert biomass to produce high value-added chemical...

AI Technical Summary

Problems solved by technology

However, the catalytic system has high active metal loading, low catalytic activity, harsh reaction conditions (high temperature, high pressure)), and poor stability of the catalyst in the liquid phase system, which limits its large-scale application.

Chinese patent CN104841436A publicly reported that metal nano-Cu is dispersed and anchored on the MgO carrier, and a Cu / MgO catalyst is prepared for the hydrogenation of furfural to prepare furfuryl alcohol. o C, under one atmospheric pressure, the conversion rate of furfural is 90%~99%, and the selectivity of furfuryl alcohol is 90%~99%, but the specific surface area of ​​the catalyst carrier is small, and the dispersion and stability of the active metal Cu are poor, which limits its large scale development

Chinese patent CN106732706 discloses a copper-based catalyst with rare earth elements as additives and copper oxide (28wt%~75wt%) as active metal, which is used to prepare furfuryl alcohol by hydrogenation of furfural in liquid phase. In a batch reactor, 200 o C, reacted for 1.5 h under the condition of 7 MPa, the conversion rate of furfural was 99.5%, and the selectivity of furfuryl alcohol was 99.7%. Polymerization occurs to generate humic substances, reducing the yield of the target product furfuryl alcohol

[0005] In summary, the preparation of furfuryl alcohol by the existing technology is mainly based on the biomass-based platform compound furfural as raw material, the raw material cost is high, there are large loading of catalytic active centers in the catalytic hydrogenation process, harsh reaction conditions, poor catalyst stability, raw material Furfural is prone to aggregation and other problems under high temperature conditions in the water phase, making it difficult to apply to large-scale industrial production