Preparation method and application of sulfonic acid functionalized inorganic-organic hybrid polymer catalyst

Abstract

The invention discloses a preparation method of a sulfonic acid functionalized inorganic-organic hybrid polymer catalyst. The method has a simple process and is convenient to operate without the needof specific precision and expensive devices. No precious metal participates in the preparation of the catalyst, and the catalyst simultaneously contains multiple catalytic sites such as Lewis acid sites / Lewis basic sites and Br-nsted acid sites and has good catalytic activity and cost advantage. According to the method for preparing the catalyst, lower alcohol, which is cheap and easily available,can be used simultaneously as an in situ hydrogen donor, an etherification reactant and a reaction medium, and 5-hydroxymethylfurfural is subjected to continuous reduction and etherification to be converted into corresponding 2,5-dialkyloxymethyl furan by a stepwise temperature control method. The whole process requires no additional exogenous hydrogen donor or other reaction solvent. The reaction system composition is safe and simple, which facilitates separation of the target product. More importantly, the stepwise temperature control method enables the Lewis acid sites / Lewis basic sites and Br-nsted acid sites of the catalyst to perform the catalytic action respectively at an appropriate temperature, and intermediate products and the target product can be stepwise and continuously generated. Thus, formation of other by-products can be avoided, and the method is also beneficial to enhance selectivity and yield of the intermediate products and the target product.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a preparation method of a sulfonic acid functionalized inorganic-organic hybrid polymer catalyst and its use in catalyzing the reductive etherification of 5-hydroxymethylfurfural to prepare 2,5-dialkoxymethylfuran in the application. Background technique [0002] Biomass is the only renewable resource containing carbon in nature, which has the advantages of various types, abundant reserves and low price. In recent years, the conversion of biomass resources into high-quality vehicle liquid fuels has attracted the attention of many scientists at home and abroad. For now, although bioethanol is the most common and commonly used bio-based vehicle liquid fuel, its disadvantages such as low energy density, low octane number and low compatibility of gasoline and diesel make it not the most ideal bio-based fuel. Liquid fuel for vehicles. Compared with bioethanol, 2,5-di...

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Problems solved by technology

[0003] Chinese patent ZN201210326624.3 discloses a method for preparing 2,5-diethoxymethylfuran from 5-hydroxymethylfurfural. The catalysts used in this method are Pt / C and Ru / Al 2 o 3 Such noble metal catalysts are expensive and costly; the hydrogen donor used is H 2 , there is a large potential safety hazard in the reaction process, and the utilization rate of atoms is low

[0004] Chinese patent CN106946820A discloses a method for preparing 2,5-furandimethanol and its etherification products from 5-hydroxymethylfurfural. The catalyst used in the method is ZrO 2 / Beta1401, ZrO 2 / MCM-41, ZrO 2 / USY and ZnO-ZrO 2 / SBA-15 and other supported catalysts, the preparation process is cumbersome and the preparation time is long; the required reaction temperature is as high as 180°C, the energy consumption of the reaction process is high, and the economy is poor

[0005] Chinese patent CN106957289A discloses a method for in situ catalyzing carbohydrates to prepare furan ethers, the catalyst used in this method is AlCl 3 , SnCl 4 and ZrOCl 2 and other metal chloride catalysts, which are highly corrosive, and hydrochloric acid will be produced during the reaction, which is also highly corrosive, and has extremely high requirements for reaction equipment; the required reaction temperature is as high as 240 ° C, and there is also high energy consumption and economical lack of sex