Ultralow-content noble metal composite catalyst for acetylene hydrochlorination reaction and preparation method thereof

A composite catalyst and acetylene hydrochlorination technology, applied in the field of catalysis, can solve problems such as poor stability and rapid catalyst deactivation, and achieve the effects of improving performance, high added value of products, and reducing production costs

Active Publication Date: 2019-06-14
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the whole, although noble metal catalysts are used in acetylene hydrochlorination to prepare vinyl chloride, although they have good selectivity and activity, their stability is poor. The development of industrially applied acetylene hydrochlorination noble metal catalysts ca

Method used

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  • Ultralow-content noble metal composite catalyst for acetylene hydrochlorination reaction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] 1. Wash the columnar coconut shell activated carbon with tap water several times to remove the surface impurities and ash, and then slowly add it to the 10% mass fraction of nitric acid aqueous solution, and heat and boil for 1 hour. After cooling, it is repeatedly immersed and washed with deionized water until the pH value of the washing liquid is above 4, and finally dried in a blast drying box at 120° C. to obtain acid-treated cylindrical coconut shell activated carbon.

[0026] 2. According to the molar ratio of chloroauric acid to cysteine ​​of 1:10, take 0.2mL 0.25mol / L chloroauric acid aqueous solution in a beaker, add deionized water to dilute to 20mL, and then add 5mL 0.1mol / L dropwise The L-cysteine ​​aqueous solution had turbidity at the beginning, and the precipitate dissolved after being dropped to an excessive amount to obtain a gold-cysteine ​​complex solution.

[0027] 3. According to the mass content of gold in the catalyst being 0.1% and t...

Example Embodiment

[0028] Example 2

[0029] 1. Wash the flaky coconut shell activated carbon with tap water several times to remove the surface impurities and ash, and then slowly add it to the 10% nitric acid aqueous solution and heat and boil for 1 hour. After cooling, it is repeatedly soaked and washed with deionized water until the pH value of the washing liquid is above 4, and finally dried in a blast drying box at 120° C. to obtain acid-treated flaky coconut shell activated carbon.

[0030] 2. According to the molar ratio of chloroauric acid to glutamine of 1:10, take 0.1mL 0.25mol / L chloroauric acid aqueous solution in a beaker, add deionized water to dilute to 20mL, and then add 2.5mL 0.1mol / L dropwise The L-glutamine aqueous solution had turbidity at the beginning, and the precipitate dissolved after being dropped to an excessive amount to obtain a gold-glutamine complex solution.

[0031] 3. According to the mass content of gold in the catalyst being 0.05% and the mass content of cerium chl...

Example Embodiment

[0032] Example 3

[0033] 1. Wash the columnar wooden activated carbon with tap water several times to remove the surface impurities and ash, and then slowly add it to the 20% nitric acid aqueous solution and heat and boil for 1 hour. After cooling, it is repeatedly immersed and washed with deionized water until the pH value of the washing solution is above 4, and finally dried in a blast drying box at 120° C. to obtain acid-treated columnar wooden activated carbon.

[0034] 2. According to the molar ratio of chloroauric acid to cysteine ​​of 1:8, take 0.5mL 0.25mol / L chloroauric acid aqueous solution into a beaker, add deionized water to dilute to 20mL, and then add 10mL 0.1mol / L dropwise The L-cysteine ​​aqueous solution had turbidity at the beginning, and the precipitate dissolved after being dropped to an excessive amount to obtain a gold-cysteine ​​complex solution.

[0035] 3. According to the mass content of gold in the catalyst being 0.25% and the total mass content of coppe...

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Abstract

The invention discloses an ultralow-content noble metal composite catalyst for acetylene hydrochlorination reaction and a preparation method thereof, wherein the catalyst is obtained by loading a noble metal-amino acid complex and a co-catalytic component on acid-treated activated carbon, wherein amino acids are cysteine, glutamine, asparaginate and the like, the co-catalytic component is copper chloride, cobalt chloride, cerium chloride, bismuth chloride, cesium chloride and the like; and the catalyst comprises, by mass, 0.05-0.25% of a noble metal component and 0.06-0.90% of the co-catalyticcomponent. According to the preparation method, the noble metal-amino acid complex and the co-catalytic component are sequentially impregnated on the acid-treated activated carbon, the catalyst is obtained by freeze-drying, the preparation process is simple and pollution-free, the method is suitable for industrial scale production, the catalyst has excellent catalytic activity, selectivity and long service life in the acetylene hydrochlorination reaction, the acetylene conversion rate can be kept above 98.5% in a long-time operation; the chloroethylene selectivity is more than 99%.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to an ultra-low-content noble metal composite catalyst for acetylene hydrochlorination and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is the second most versatile synthetic resin in the world. In recent years, the process of producing vinyl chloride monomer by the calcium carbide method (acetylene method) has developed rapidly in my country and has become the mainstream of the PVC industry. However, the present acetylene method to prepare vinyl chloride basically adopts mercuric chloride as the active component of the catalyst. The activity and selectivity of the catalyst are relatively high, and the price is relatively low, but there is a biggest problem of poor thermal stability. In the process of use, highly toxic mercury chloride will continue to be volatilized, which will cause serious pollution to the environment while th...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J31/26B01J31/30B01J37/02B01J37/32C07C17/08C07C21/06
Inventor 李霖曾利辉金晓东曾永康张之翔杨乔森万克柔李岳锋朱柏烨
Owner XIAN CATALYST NEW MATERIALS CO LTD
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