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

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 ...

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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

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