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Method for preparing carboneous solid acid catalyst

A solid acid catalyst and carbon-based technology, which is applied in the preparation of solid acid catalysts and carbon-based solid acid catalysts, can solve the problems of sulfonated sulfonic acid groups, etc., and achieve reduced corrosion, safe reaction process, and low raw material prices Effect

Inactive Publication Date: 2009-07-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no research report on the sulfonation of such carbon materials to introduce sulfonic acid groups at home and abroad.

Method used

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  • Method for preparing carboneous solid acid catalyst
  • Method for preparing carboneous solid acid catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 2.021g of glucose and 2.077g of sulfosalicylic acid, add a certain amount of ethanol, stir to make them evenly mixed, place them in a stainless steel autoclave lined with polytetrafluoroethylene, and react in an oven at 180°C for 24 hours. Take it out and cool it, wash it with deionized water and ethanol, and filter it, and dry the obtained product overnight at 90°C. The surface acid content measured by acid-base titration was 1.2 mmol / g.

Embodiment 2

[0019] Weigh 2.085g of sucrose and 3.104g of sulfosalicylic acid, add a certain amount of ethanol, stir to make them evenly mixed, place them in a stainless steel autoclave lined with polytetrafluoroethylene, and react in an oven at 180°C for 24 hours. Take it out and cool it, wash it with deionized water and ethanol and filter it, and dry the obtained product overnight at 90°C. The surface acid content measured by acid-base titration was 1.1 mmol / g.

Embodiment 3

[0021] Weigh 2.090g of glucose and 2.164g of p-toluenesulfonic acid, add a certain amount of ethanol, stir to make them evenly mixed, place them in a stainless steel autoclave lined with polytetrafluoroethylene, and react in an oven at 180°C for 24 hours. Take it out and cool it, wash it with deionized water and ethanol and filter it, and dry the obtained product overnight at 90°C. The surface acid content measured by acid-base titration is 1.5 mmol / g.

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Abstract

The invention relates to a method for preparing a sulfonated carbon solid acid catalyst, which uses a sulfonic aromatic compound to replace sulfuric acid. The method uses glucide as a raw material and an aromatic compound with sulfonic group as a sulfonating reagent to generate the carbon solid acid catalyst in one step through solvent heat treatment at a temperature of between 150 and 200 DEG C. The method has the advantages that the prepared solid acid has controllable surface acid content and good stability; the glucide as the raw material has rich resource and low price; the reaction condition is mild, and the preparation process is simple; and concentrated sulfuric acid or fuming sulfuric acid are not adopted as the sulfonating reagent, so equipment can be corroded less. The solid acid can be used as the catalyst of hydrolyzation of cellulose, alkylation reaction, biodiesel preparation and other reactions. Compared with the prior sulfuric acid catalyst, the catalyst has the advantages of non corrosion, easy separation, reusage and non production of waste acid or sewage, and has better advantages in the application field with special requirement, such as fine chemistry industry and pharmaceutical synthesis.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a preparation method of a solid acid catalyst, in particular to a preparation method of a carbonaceous solid acid catalyst in which sugars are sulfonated with sulfonic acid compounds. Background technique [0002] Compared with homogeneous acid catalysts, solid acid catalysts have the advantage of being easy to separate, recycle and reuse. And the carbonaceous solid acid catalyst is relatively Nafion, Nb(OH) 5 Such solid acid catalysts have attracted great attention because of their low cost and high skeleton stability (acid-base stability, etc.). Carbon-based solid acid rich in sulfonic acid groups on the surface, because the strong acidity of sulfonic acid groups can be used for reactions that cannot be catalyzed by molecular sieves with lower acidity and smaller pores. For example, carbon-based solid acid catalysts can be used for cellulose It has a good application prospect...

Claims

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Application Information

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IPC IPC(8): B01J31/02C08B15/02C07B37/04C10L1/04
Inventor 任家文张报华王艳芹卢冠忠刘晓晖苗莹郭耘郭杨龙张志刚王筠松
Owner EAST CHINA UNIV OF SCI & TECH
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