Adsorption arsenic removal catalyst and preparation method thereof

A catalyst and arsenic removal technology, which is applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problems of low arsenic removal efficiency of the catalyst, complex process operation, small adsorption capacity, etc., and achieve excellent arsenic removal performance , Improve reaction efficiency, improve the effect of dispersion

Pending Publication Date: 2022-04-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The main purpose of the present invention is to provide an adsorption arsenic removal catalyst and its preparation method, to overcome the defects of the existing preparation methods or complex process operation, or the prepared catalyst has low arsenic removal efficiency, small adsorption capacity and short service life

Method used

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  • Adsorption arsenic removal catalyst and preparation method thereof
  • Adsorption arsenic removal catalyst and preparation method thereof
  • Adsorption arsenic removal catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Mix 500g of activated carbon, 1000g of pseudo-boehmite, 30g of turnip powder and 20g of methyl cellulose for 5 minutes, add 1600g of aqueous solution containing 5% nitric acid, roll for 30 minutes and then knead for 30 minutes, extrude with a Φ3.0 orifice plate, Drying at 120°C for 2 hours, and calcining at 450°C for 4 hours in an oxygen-free atmosphere to obtain carrier Z-1. Dissolve the metal salt containing copper nitrate in deionized water, and use the equal volume saturated impregnation method to load the above impregnation solution on the carrier Z-1, let it stand and dry for 12 hours, then dry it at 120°C for 2 hours, and bake it at 300°C for 4 hours. Catalyst C1 is obtained.

Embodiment 2

[0050] Mix 500g of activated carbon, 500g of pseudo-boehmite, 50g of turnip powder and 50g of methyl cellulose for 5 minutes, add 1000g of aqueous solution containing 5% nitric acid, roll for 30 minutes and then knead for 30 minutes, extrude with a Φ3.0 orifice plate, Drying at 120°C for 2 hours, and calcining at 450°C for 4 hours in an oxygen-free atmosphere to obtain carrier Z-2. Dissolve the metal salt containing copper nitrate in deionized water, and use the equal volume saturated impregnation method to load the above impregnation solution on the carrier Z-2, let it stand and dry for 12 hours, then dry at 120°C for 2 hours, and bake at 300°C for 4 hours, finally Catalyst C2 is obtained.

Embodiment 3

[0052] Mix 1000g of activated carbon, 500g of pseudo-boehmite, 80g of turnip powder and 80g of ethyl cellulose for 5 minutes, add 1600g of aqueous solution containing 5% nitric acid, roll for 30 minutes and then knead for 30 minutes, extrude with a Φ3.0 orifice plate, Dry at 120°C for 2h, and calcined at 450°C for 4h in an oxygen-free atmosphere to obtain carrier Z-3. Dissolve the metal salt containing copper nitrate in deionized water, and use the equal volume saturated impregnation method to load the above impregnation solution on the carrier Z-3, let it stand and dry for 12 hours, then dry at 120°C for 2 hours, and bake at 300°C for 4 hours, finally Catalyst C3 is obtained.

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Abstract

The invention discloses a catalytic cracking gasoline adsorption dearsenification catalyst with large specific surface area, hierarchical pore distribution and high dearsenification performance and a preparation method thereof, and the method comprises the following steps: 1) mixing active carbon and pseudo-boehmite in proportion, grinding, stirring, adding a pore-enlarging agent and an acid solution, extruding into strips, drying, and roasting under an anaerobic condition to prepare a carbon-alumina composite carrier; (2) adjusting the pH value of the metal precursor solution, and impregnating the solution containing the active metal precursor into the carrier by adopting an isovolumetric saturated impregnation method; and 3) drying the catalyst, and roasting in an oxygen-free environment to obtain the finished product catalyst. The carrier with a composite pore channel structure can improve diffusion, reaction and escape of reactant molecules in pore channels, and the reaction efficiency is improved; metal with partially filled d tracks is selected as active metal, so that the acting force between the arsenide and the metal can be improved, and the arsenide is deeply removed; the pH value of the metal precursor solution is adjusted to be higher than the isoelectric point of the metal oxide or hydroxide, the acting force between the metal and the carrier can be weakened, the dispersity of the metal is improved, and finally the arsenic removal efficiency of the catalyst is improved.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for adsorption and removal of arsenic in the field of petrochemical industry, and is especially suitable for the field of low-temperature adsorption and removal of arsenic in liquid petroleum hydrocarbons. Background technique [0002] With the depletion of petroleum resources, the composition of crude oil is more complex, and the content of arsenic in crude oil produced in some oil fields increases year by year. Hydrogenation catalysts contain Group VIII elements, and organic arsenic and inorganic arsenic in oil will be reduced to AsH under high-temperature hydrogenation conditions 3 , trivalent As has active reducing properties, it is easy to combine with the d-orbital electrons of group VIII elements to form a coordination bond to poison and deactivate the catalyst, and this poisoning is difficult to eliminate through activation or regeneration methods, so the raw material oil A very small ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J21/04B01J35/10B01J32/00B01J37/02B01J37/08B01J23/72B01J23/755B01J23/80B01J23/885B01J23/835B01J23/847B01J23/89B01J37/03C10G25/00
CPCB01J21/18B01J21/04B01J37/0201B01J37/082B01J23/72B01J23/755B01J23/80B01J23/885B01J23/835B01J23/8472B01J23/8926B01J35/1019B01J35/1023B01J35/1042B01J35/1061B01J35/0066B01J37/03C10G25/003C10G2300/202
Inventor 李阳姜增琨冯琪何盛宝葛少辉赵秦峰鞠雅娜钟海军吕忠武李天舒
Owner PETROCHINA CO LTD
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