Dearsenification catalyst and preparation method thereof

Abstract

The invention relates to a dearsenification catalyst and a preparation method thereof. Copper oxide and nickel oxide are loaded by an impregnation method, and then are further treated to form an oxidesolid solution of copper and nickel. According to the dearsenification agent obtained after dipping-air atmosphere roasting-reducing atmosphere roasting-oxidation / helium atmosphere roasting, a metalsolid solution of CuNiO2 is formed and is uniformly dispersed on the inner surface of a molecular sieve, especially the inner surface of a macroporous Y-type molecular sieve, so that excellent dearsenification capacity is obtained. The formation of the solid solution metal oxide can give full play to the ability of complexing metal elements with arsenic elements, and the dearsenification capacityis improved by 30% compared with that of an impregnated CuONiO dearsenification agent.

Description

technical field [0001] The disclosure relates to an arsenic removal catalyst and a preparation method thereof, and relates to the removal of arsenic compounds in light oil products containing arsenic compounds in industries and fields such as oil refining and chemical industry. Background technique [0002] The information disclosed in this background section is only intended to increase some understanding of the general background of the disclosure, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes prior art that is already known to those skilled in the art. [0003] With the depletion of oil resources, the composition of crude oil becomes more complex, and the content of crude oil produced in some oil fields is also increasing. Arsenic compounds in petroleum hydrocarbons will seriously affect their processing, mainly manifested as the poisoning effect of arsenic compounds on catalysts. In the ethylene refini...

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Problems solved by technology

[0005] The arsenic removal catalysts in the prior art include activated carbon and gamma-alumina supported metal copper, activated alumina supported noble metal (a mixture of platinum, palladium and metal nickel), gamma-alumina, aluminosilicate and kaolin mixed, etc. Although they have a certain effect of removing arsenic, they still have some disadvantages. For example, activated carbon and γ-alumina support metal copper. The disadvantages of this catalyst are, first, there is a safety hazard when the activated carbon is regenerated; second, the activated carbon powder is easy to fall off Pollution to the adsorption medium; activated alumina supports precious metals (a mixture of platinum, palladium and metallic nickel), the disadvantages of this catalyst are: first, the specific surface area of ​​activated alumina is small, and the adsorption reaction efficiency is low; second, the cost is high; third, different Metals are only mixed physically, without forming solid solutions such as alloys or metal oxides, which affects the ability to form complexes with arsenides and affects the further improvement of arsenic removal performance

In addition, they generally have the disadvantages of low arsenic adsorption capacity and low mass space velocity. For example, the arsenic adsorption capacity of activated carbon and γ-alumina supported metal copper arsenic removal catalyst, and activated alumina supported noble metal arsenic removal catalyst is 0.3 -0.4g / 100g arsenic removal catalyst, the arsenic adsorption capacity of the mixed arsenic removal catalyst of γ-alumina, aluminosilicate and kaolin is 0.1-0.15g / 100g arsenic removal catalyst; activated carbon and γ-alumina supported metal copper desorption Arsenic catalyst, and activated alumina-supported noble metal dearsenic catalyst, and a mixture of γ-alumina, aluminosilicate and kaolin. The dearsenic adsorption mass space velocity of the catalyst is 0.8-1.0h -1

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