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Acid-base bifunctional solid catalyst for preparing 5-hydroxymethylfurfural and its preparation method and application

A solid catalyst, acid-base dual-function technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of catalyst structure collapse, no mention of catalytic application, easy shedding of metal ions, etc. , to achieve the effect of less discharge of three wastes, industrial application and convenient preparation

Inactive Publication Date: 2019-07-05
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the polar reaction system of this kind of metal ionic liquid heteropolyacid catalyst, the metal ions are easy to fall off, resulting in the collapse of the catalyst structure, which is not conducive to the catalytic reaction.
Moreover, the patent only discloses the preparation method of the catalyst, and does not mention its catalytic application

Method used

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  • Acid-base bifunctional solid catalyst for preparing 5-hydroxymethylfurfural and its preparation method and application
  • Acid-base bifunctional solid catalyst for preparing 5-hydroxymethylfurfural and its preparation method and application
  • Acid-base bifunctional solid catalyst for preparing 5-hydroxymethylfurfural and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation of acid-base bifunctional solid catalyst

[0038] (1) Preparation of amine-functionalized alkylimidazole ionic liquids

[0039] Add 0.2mol of methylimidazole and 0.2mol of 2-bromoethylamine hydrobromide into a 100mL three-necked flask, add 50mL of acetonitrile, and reflux and stir for 24h under the protection of nitrogen. After the reaction is completed, use NaOH solution to neutralize to pH=7. Remove acetonitrile and water by rotary evaporation to obtain a white sticky solid, wash and filter with ethanol to remove solid NaBr, keep the filtrate, and remove ethanol by rotary evaporation of the filtrate, then dry at 80°C for 12 hours to obtain an amine-functionalized methylimidazole ionic liquid [MimAM]Br, its structural formula is:

[0040]

[0041] (2) Preparation of acid-base bifunctional solid catalyst

[0042] Dissolve the amine-functionalized methylimidazolium ionic liquid in water, and then add H 3 PW 12 o 40 Heteropolyacids were reacted, in wh...

Embodiment 2

[0051] According to the method for preparing an acid-base bifunctional solid catalyst according to Example 1, the methylimidazole ionic liquid and H 3 PW 12 o 40 The molar ratio of heteropolyacid is 2:1 to prepare the catalyst [MimAM] 2 HPW 12 o 40 , all the other conditions are identical with embodiment 1. The specific method is as follows:

[0052] Dissolve the amine-functionalized methylimidazolium ionic liquid in water, and then add H 3 PW 12 o 40 Heteropolyacids were reacted, in which the amine-functionalized methylimidazolium ionic liquid was reacted with H 3 PW 12 o 40 The molar ratio of heteropolyacid was 2:1, solid precipitated immediately, stirred at 25°C for 24h, filtered, washed twice with deionized water, and then dried at 80°C for 12h to obtain acid-base bifunctional solid catalyst [MimAM] 2 HPW 12 o 40 , whose structural formula is:

[0053]

[0054] For Catalyst [MimAM] 2 HPW 12 o 40 Carry out pyridine adsorption infrared detection, its pyri...

Embodiment 3

[0058] According to the method for preparing an acid-base bifunctional solid catalyst in Example 1, the methylimidazole in Example 1 is changed to butylimidazole, and the remaining preparation steps are the same as in Example 1 to obtain an acid-base bifunctional solid catalyst [BimAM]H 2 PW 12 o 40 , whose structural formula is:

[0059]

[0060] According to the application of acid-base bifunctional solid catalyst in embodiment 1, the catalyst [MimAM]H in embodiment 1 2 PW 12 o 40 Change to Catalyst [BimAM]H 2 PW 12 o 40 , and all the other steps are the same as in Example 1. Among them, the catalyst recovery rate is 92.8%, the glucose conversion rate is 100%, and the HMF yield rate is 70.3%.

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Abstract

The invention relates to the technical field of chemical catalysis, in particular to an acid-base bifunctional solid catalyst for preparing 5-hydroxymethylfurfural, a preparation method and application thereof. The acid-base bifunctional solid catalyst uses an amino-functionalized alkylimidazole ionic liquid as a cationic precursor, and uses H 3 PW 12 o 40 The heteropolyacid is an anion precursor, which is prepared by hydrothermal synthesis. Then the prepared acid-base bifunctional solid catalyst is used for the preparation of 5-hydroxymethylfurfural. The invention not only retains the high catalytic activity of the ionic liquid and the heteropolyacid, realizes the acid-base synergistic catalysis in the solid catalyst, but also has the advantages of convenient preparation, less consumption and good stability. The invention has the advantages of simple process, wide selection range of raw material biomass sugar, mild reaction conditions, and less discharge of three wastes, and is beneficial to realize the industrial application of dehydration of biomass sugar to prepare HMF.

Description

technical field [0001] The invention relates to the technical field of chemical catalysis, in particular to an acid-base bifunctional solid catalyst for preparing 5-hydroxymethylfurfural, a preparation method and application thereof. Background technique [0002] Coal, oil, natural gas and other fossil resources are the energy basis for the development of the world today. However, the reserves of fossil resources are limited and the regeneration cycle is long. In recent years, the ever-increasing demand for energy has forced people to look for green and renewable energy that can replace fossil resources. Biomass is considered to be an ideal alternative energy source because of its wide range of sources, abundant reserves, cheap and easy access. 5-Hydroxymethylfurfural (HMF) is a key platform compound between biomass chemistry and petrochemistry, which can prepare hundreds of chemicals through reactions such as oxidation, hydrogenation, esterification, polymerization and hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/46B01J31/18B01J27/188B01J35/02B01J37/10
CPCY02P20/584
Inventor 赵萍萍崔洪友张云云王勇宋峰孙秀玉
Owner SHANDONG UNIV OF TECH
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