Dearsenification catalyst and preparation method thereof

A catalyst and catalyst quality technology, applied in catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as low arsenic adsorption capacity, adsorption medium pollution, and easy fall-off of activated carbon powder, and achieve simple preparation process and reduced The effect of cost of use

Active Publication Date: 2020-09-18
BEIJING UNIV OF CHEM TECH +1
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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

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  • Dearsenification catalyst and preparation method thereof

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[0025] As introduced in the background technology, there are certain deficiencies in the current de-arsenic catalyst and its preparation method. In addition, in order to solve the above technical problems, in the first typical implementation mode of the present disclosure, a preparation method of the arsenic-removal catalyst is provided , the method includes the following steps:

[0026] Molecular sieves-supported copper salt and nickel salt by impregnation method, dried, and then calcined in air atmosphere to form arsenic removal catalyst precursor-CuO / NiO / MS;

[0027] then in H 2 / N 2 Roasting at 750-850°C for 5-7h in a reducing atmosphere;

[0028] Then oxidize at 750-850°C for 5-7h in an oxidizing atmosphere to form CuNiO 2 / MS metal oxide solid solution, that is, arsenic removal catalyst.

[0029] Through the above method, the copper element and the nickel element can be firstly formed into an alloy, and then oxidized into a metal solid solution, and the synergy of th...

Embodiment 1

[0061] A preparation method of arsenic removal catalyst, the technological process is as follows figure 1 , the method includes the following steps:

[0062] (1) Preparation of modified macroporous Y-type molecular sieve particles: 100g modified macroporous Y-type molecular sieve powder (specific surface area 700m 2 / g, the pore diameter is about 0.8nm, the content of sodium oxide is 1.5%, the content of rare earth oxide is 12.5%, and the rare earth oxide is La 2 o 3 ), 12g macroporous alumina (specific surface area 200m 2 / g, pore diameter about 1.5nm), 3g nitric acid (78wt%), 40g deionized water are mixed, after kneading, utilize extruder to extrude into the bar of diameter 2.5mm, 100 ℃ of drying 2 hours, crushing length is 3- 8mm cylindrical pellets.

[0063] (2) Loading copper nitrate and nickel nitrate by impregnation method: under normal temperature conditions, dissolve 9.05g copper nitrate trihydrate and 1.95g nickel nitrate hexahydrate in 50g deionized water, and p...

Embodiment 2

[0067] The modified macroporous Y-type molecular sieve particles were prepared by the same method as in Embodiment 1.

[0068] Load copper nitrate and nickel nitrate by impregnation method: under normal temperature conditions, dissolve 15g copper nitrate trihydrate and 3.25g nickel nitrate hexahydrate in 50g deionized water, put 100g macroporous Y-type molecular sieve particles into the water, and pass the equal volume impregnation method , load copper nitrate and nickel nitrate on a large-pore Y-type molecular sieve, and dry at 100°C.

[0069] Aftertreatment process and with embodiment 1.

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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...

Claims

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Application Information

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IPC IPC(8): B01J29/14B01J37/14B01J37/18B01J37/08B01J37/02C10G25/00C10G29/16
CPCB01J29/146B01J37/0201B01J37/088B01J37/14B01J37/18B01J2229/186B01J2229/40C10G25/003C10G29/16C10G2300/202
Inventor 朱吉钦张傑曲令多
Owner BEIJING UNIV OF CHEM TECH
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