Copper oxide catalyst for preparing chlorine gas from chlorine hydride by catalytic oxidation, and preparation method and application thereof

A technology for catalytic oxidation and hydrogen chloride, applied in the direction of metal/metal oxide/metal hydroxide catalyst, preparation with chloride, catalyst activation/preparation, etc., can solve problems such as increased catalyst viscosity, high cost of ruthenium compounds, and equipment corrosion , to improve the activity and stability, the preparation method is simple and easy, and the effect of prolonging the service life

Inactive Publication Date: 2012-09-12
SHANGHAI CHLOR ALKALI CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This chemical reaction has the following characteristics: ①This is a strongly exothermic reversible reaction, limited by thermodynamic equilibrium, the equilibrium conversion rate of HCl is low
Raising the reaction temperature is beneficial to increase the reaction rate, but it will reduce the equilibrium conversion rate; although lowering the reaction temperature can increase the equilibrium conversion rate, it will reduce the reaction rate
②Because the equilibrium conversion rate is not high, unreacted HCl and possibly condensed H 2 O is combined to generate hydrochloric acid, which brings serious equipment corrosion problems, and the condensed H 2 O increases the viscosity of the catalyst and reduces the fluidization performance of the catalyst
③ During the high-temperature reaction process, the active components of the catalyst are easily lost, resulting in deactivation of the catalyst
Due to the higher reaction temperature of CuCl 2 The active components are easy to lose, resulting in a short service life of the catalyst
[0010] Although the above-mentioned existing patented technologies have their own characteristics, they also have their own shortcomings, such as: containing toxic component Cr element, high cost of ruthenium compound, CuCl 2 Disadvantages such as easy high temperature loss of active components

Method used

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  • Copper oxide catalyst for preparing chlorine gas from chlorine hydride by catalytic oxidation, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation method of the activated alumina modified by rare earth oxide comprises the following steps:

[0033] Aluminum nitrate and cerium nitrate are mixed and dissolved, and ammonia water is added to the mixed solution under stirring until the pH is 8.6 to obtain alumina gel;

[0034] The weight percent content of cerium nitrate is 3.40% of the total weight of aluminum nitrate and cerium nitrate;

[0035] After washing and filtering the obtained gel, dry it at 90°C for 12 hours, then pretreat it in a tube furnace at 500°C for 4 hours, and finally calcinate the obtained product at 1100°C for 24 hours to prepare ceria-modified activated alumina , the weight percent content of cerium oxide is 8.7%;

[0036] 14.25gCuCl 2 2H 2 O and 3.75g KCl were dissolved in 31.5mL of deionized water, and then an equal volume of 57.5g of ceria-modified activated alumina support was impregnated, and finally stirred at 60°C for 2h, kept at 40°C for 12h, and dried at 120°C for 12h ,...

Embodiment 2

[0044] Carrier: the preparation method of activated alumina modified by rare earth oxide, comprising the following steps:

[0045] Aluminum nitrate and lanthanum nitrate are mixed and dissolved, and ammonia water is added to the mixed solution until the pH is 8.6 under stirring to obtain an alumina gel;

[0046] The weight percent content of lanthanum nitrate is 3.38% of the total weight of aluminum nitrate and lanthanum nitrate;

[0047] After washing and filtering the obtained gel, dry it at 90°C for 12h, then pretreat it in a tube furnace at 500°C for 4h, and finally calcinate the obtained product at 1100°C for 24h to obtain a rare earth oxide-modified active Aluminum oxide; Lanthanum oxide weight percent content is 8.7%;

[0048] 14.25gCuCl 2 2H 2 O and 3.75g KCl were dissolved in 31.5mL deionized water, and then 57.5g of lanthanum oxide-modified activated alumina carrier () was impregnated with an equal volume, and finally stirred at 60°C for 2h, kept at 40°C for 12h, ...

Embodiment 3

[0055] Aluminum nitrate and lanthanum nitrate are mixed and dissolved, and ammonia water is added to the mixed solution until the pH is 8.6 under stirring to obtain an alumina gel;

[0056] The weight percentage content of lanthanum nitrate is 2.6% of aluminum nitrate and lanthanum nitrate gross weight;

[0057] After washing and filtering the obtained gel, dry it at 90°C for 12h, then pretreat it in a tube furnace at 500°C for 4h, and finally calcinate the obtained product at 1100°C for 24h to obtain a rare earth oxide-modified active Aluminum oxide; Lanthanum oxide weight percent content is 6.9%;

[0058] 11.88gCuCl 2 2H 2 O and 3.12g KCl were dissolved in 33.8mL of deionized water, and then 60.4g of lanthanum oxide-modified activated alumina carrier was impregnated with equal volume, and finally stirred at 60°C for 2h, kept at 40°C for 12h, and dried at 120°C for 12h , Calcined at 400°C for 4h in an air atmosphere to prepare a supported copper oxide catalyst.

[0059] T...

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Abstract

The invention provides a copper oxide catalyst for preparing chlorine gas from chlorine hydride by catalytic oxidation, and a preparation method and application thereof. The catalyst is prepared from the following components in percentage by weight: 1-20% of CuO, 1-15% of K2O and 65-98% of support, wherein the support is rare-earth oxide modified activated alumina. The invention belongs to an environment-friendly low-cost catalyst; and the rare-earth oxide modified activated alumina is used as the support to enhance the activity and stability of the catalyst and prolong the service life of the catalyst. An isometric impregnation method is utilized to directly support copper and potassium chloride onto the rare-earth oxide modified activated alumina support, and roasting is carried out in an air atmosphere to obtain the supported copper oxide catalyst. The preparation method is simple and easy to implement, and has the advantages of high catalyst activity and high stability.

Description

technical field [0001] The invention relates to a supported copper oxide catalyst for producing chlorine by catalytic oxidation of hydrogen chloride and a preparation method thereof. Background technique [0002] Since Deacon proposed in 1868 to use manganese or copper salts as catalysts to oxidize hydrogen chloride to chlorine with air, the technology of hydrogen chloride catalytic oxidation to chlorine has attracted much attention. However, the rapid development of the chlor-alkali industry has restricted the application of the Deacon method. At present, most of the chlorine gas is produced by electrolysis of sodium chloride aqueous solution. [0003] As the growth rate of chlorine gas demand far exceeds that of sodium hydroxide, attention to Deacon process has increased significantly. Deacon process can avoid sodium hydroxide produced in chlor-alkali industry and achieve a good chlor-alkali balance. At present, the total amount of industrial by-product hydrogen chloride ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J37/02C01B7/04
Inventor 马斌全郭杨龙袁茂全冯看卡陈斌武卢冠忠
Owner SHANGHAI CHLOR ALKALI CHEM
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