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Method for hydrothermal synthesis of carbon-silicon composite solid acid catalyst

A technology for compounding solid acid and synthesizing carbon, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as high price and thermal instability, and achieve low cost, low emission, The effect of high acid value

Inactive Publication Date: 2012-02-29
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that it is unstable to heat and the price is too high for industrial use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, the synthesis of novel carbon-based solid acid:

[0026] 1. Preparation of carbon-silicon composite material: Dissolve 5g of glucose in 50% aqueous solution, adjust the pH value of the solution between 3 and 4 by adding hydrochloric acid dropwise, add 2.5g of orthosilicate ethyl ester dropwise, drop it in about half an hour After the addition is complete, continue to stir and hydrolyze for 15 minutes, transfer to an autoclave, heat in an oven at 180°C for 4 hours, cool to room temperature, open the autoclave, filter, wash, and dry to obtain a carbon-silicon composite material ;

[0027] 2. Preparation of carbon-silicon composite solid acid: add 2 g of the carbon-silicon material obtained above to 50 ml of concentrated sulfuric acid, heat to 150°C for sulfonation for 12 hours, cool to room temperature, introduce the mixture into 1 liter of water, and filter , washed with hot water at 80 degrees, and dried to obtain a novel carbon-silicon composite solid ac...

Embodiment 2-4

[0029] Except for the following differences, the rest are the same as in Example 1, heated at 5g of glucose, carbonized at 180°C, and ethyl orthosilicate was used according to the ratio in Table 1, and reacted for 4 hours.

[0030] Table 1

[0031] Example

Embodiment 5-8

[0033] Except following difference, all the other are with embodiment 1, and the influence result of different reactants is shown in Table 2.

[0034] Table 2

[0035] Example

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Abstract

The invention discloses a method for hydrothermal synthesis of a carbon-silicon composite solid acid catalyst, which belongs to the technical field of chemical synthesis. The method comprises the following steps: preparing aqueous solution with sugar compounds easy to be carbonated, adjusting the PH value of the solution to be 3-4, dropping ethyl orthosilicate, hydrolyzing for 15 minutes under the stirring condition, transferring the solution into a high-pressure reactor, heating for 4 hours in a baking oven of 150-200 DEG C, cooling the solution to the room temperature, opening the high-pressure reactor, filtering, washing and drying, thereby obtaining a carbon-silicon composite material, and then sulfonating the obtained carbon-silicon composite material and concentrated sulfuric acid, thereby completing the preparation of the novel carbon-silicon composite solid acid catalyst. The solid acid has the advantages that: the synthesis is green, the emissions of waste solution and waste gas are low; the acid value is high; the specific surface of the synthesized material is large; the synthesis cost is low; the catalytic effect is good; and the catalyst can be used repeatedly.

Description

technical field [0001] The invention relates to a method for synthesizing a carbon-silicon composite solid acid catalyst by a hydrothermal method, belonging to the technical field of organic chemical synthesis. Background technique [0002] In today's crisis of energy problems and environmental problems, it has become the goal of modern chemical industry to efficiently generate target products with a small amount of energy without producing unnecessary by-products. Acid catalysts are indispensable in the modern chemical industry and are widely used in the manufacture of various products such as pharmaceuticals, petrochemical products, and polymer products. However, most of the currently used liquid acid catalysts are hydrochloric acid and sulfuric acid. . The liquid catalyst used in the production process needs to be neutralized by alkali, and separated and recovered from the product by removing the salt generated by neutralization. However, a considerable amount of energy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/02B01J21/18B01J37/10B01J35/10
Inventor 齐陈泽沈永淼曾敏峰毛鑫鑫
Owner SHAOXING UNIVERSITY
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