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Modified silicon dioxide loaded polymer solid acid catalyst as well as preparation method and application thereof

A solid acid catalyst, silica technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of limiting catalyst acid site utilization efficiency, agglomeration Serious, small specific surface area of ​​the catalyst and other problems, to achieve the effect of low price, short reaction time and simple preparation method

Inactive Publication Date: 2020-11-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the specific surface area of ​​the catalyst is small (2 / g), serious agglomeration, which limits the utilization efficiency of catalyst acid sites

Method used

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  • Modified silicon dioxide loaded polymer solid acid catalyst as well as preparation method and application thereof
  • Modified silicon dioxide loaded polymer solid acid catalyst as well as preparation method and application thereof
  • Modified silicon dioxide loaded polymer solid acid catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Add 1.2g of silicon dioxide, 2.4g of silane coupling agent KH560, and 50mL of cyclohexane into a three-necked flask, and stir at 25°C for 4h to obtain a modified carrier. The structure of silane coupling agent KH560 is as follows figure 1 shown.

[0047] Add 3.5g p-hydroxybenzenesulfonic acid, 1.2g paraformaldehyde, 0.4g p-toluenesulfonic acid, 6.0g absolute ethanol to the modified carrier, polycondense at 120°C for 2 hours, cool and centrifuge to get solid product.

[0048] The solid product was washed with absolute ethanol until the supernatant was transparent, and the solid product was taken out and vacuum-dried to obtain 5.2 g of a modified silica-supported polymer solid acid catalyst.

[0049] According to infrared, thermogravimetric and nuclear magnetic detection, the mass ratio of silicon dioxide, silane coupling agent KH560 and p-hydroxybenzenesulfonic acid in the obtained catalyst is 1:2:2.9.

[0050] The infrared absorption spectrum of the polymer solid aci...

Embodiment 2

[0053] Referring to the preparation method of Example 1, the difference is that the mass of the silane coupling agent KH560 added is 2.0-9.4 g, that is, the mass ratio of silica and silane coupling agent is controlled to be 1:1.6-7.8 during the preparation process. The mass ratio of silicon dioxide, silane coupling agent KH560 and p-hydroxybenzenesulfonic acid in the obtained catalyst is 1:1.6-7.8:2.9.

Embodiment 3

[0055] Referring to the preparation method of Example 1, the difference is that the mass of p-hydroxybenzenesulfonic acid added during the preparation of the catalyst is 0.7 to 6.6 g, that is, the mass ratio of silicon dioxide and p-hydroxybenzenesulfonic acid is controlled to be 1:0.6 to 1:0.6 during preparation. 5.5. The mass ratio of silicon dioxide, silane coupling agent KH560 and p-hydroxybenzenesulfonic acid in the obtained catalyst is 1:2:0.6-5.5.

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Abstract

The invention discloses a modified silicon dioxide loaded polymer solid acid catalyst as well as a preparation method and application thereof. Modified silicon dioxide is silicon dioxide modified by asilane coupling agent KH560; a polymer is a polycondensation product of p-hydroxybenzenesulfonic acid and paraformaldehyde. The preparation method of the modified silicon dioxide loaded polymer solidacid catalyst comprises the following steps of: firstly, modifying the silicon dioxide by using the silane coupling agent KH560; and adding p-hydroxybenzenesulfonic acid and paraformaldehyde for polycondensation reaction to prepare the modified silicon dioxide loaded polymer solid acid catalyst. The preparation method is simple in process, safe and environment-friendly; the prepared modified silicon dioxide loaded polymer solid acid catalyst has very high activity and stability; the conditions for catalyzing the acetal reaction of glycerol, the esterification reaction of glycerol and the transesterification reaction of glycerol are mild; the reaction time is short; and the conversion rate of the glycerol is high.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a polymer solid acid catalyst supported by modified silicon dioxide, a preparation method thereof and an application in glycerin conversion reaction. Background technique [0002] Acid catalysts have a wide range of applications. For example, reactions such as cracking, alkylation, isomerization, hydrolysis, and hydration in traditional petroleum refining and petrochemical processes must be carried out under the action of acid catalysts; at the same time, acid Catalysts are also an essential part of recent biorefinery technologies, such as: cellulose hydrolysis, sugar dehydration, platform compound esterification, etherification and other conversion processes are inseparable from acid catalysts. [0003] Although traditional liquid acids (such as sulfuric acid, hydrochloric acid, trifluoromethanesulfonic acid, p-toluenesulfonic acid, etc.) have high catalytic activit...

Claims

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Application Information

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IPC IPC(8): B01J31/06C07C67/03C07C69/18
CPCB01J31/069C07C67/03C07C69/18
Inventor 周茹茹姜媛媛侯昭胤
Owner ZHEJIANG UNIV
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