A kind of denitrification catalyst and preparation method thereof

A technology of denitrification catalyst and palladium oxide, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy poisoning and low denitrification rate, prolong service life, reduce SO2 concentration, Aggregation-inhibiting effect

Active Publication Date: 2019-01-18
SHENYANG SANJUKAITE CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of low denitrification rate and easy poisoning in existing denitrification catalysts, and to provide a denitrification catalyst with high denitrification rate and not easy to be poisoned and its preparation method

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  • A kind of denitrification catalyst and preparation method thereof

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Embodiment 1

[0038] The preparation method of the denitration catalyst described in this embodiment comprises the following steps:

[0039] (1) Add 200g of deionized water and 90g of activated alumina in a beaker equipped with a stirrer, stir, add 175g of aqueous solution containing 38wt% hydrochloric acid after mixing, and continue to stir until a uniform sol is formed;

[0040] Add 55g of heavy magnesium oxide and 80g of deionized water into another beaker equipped with a stirrer, stir evenly, transfer to the above-mentioned sol, and continue stirring for 2 hours to obtain the first slurry;

[0041] Mix 24g of cerium chloride with 50g of deionized water, stir until the solution is transparent, add ammonia water dropwise to adjust the pH value of the solution to 7, obtain a cerium-containing aqueous solution, and then transfer it to the above-mentioned first slurry to form a second slurry, Stir the second slurry at a constant temperature of 60°C, spray dry the second slurry after 5 hours,...

Embodiment 2

[0045] The preparation method of the denitration catalyst described in this embodiment comprises the following steps:

[0046] (1) Add 148g deionized water and 68g SB powder in a beaker equipped with a stirrer, stir, add 80g of aqueous solution containing 30wt% sulfuric acid after mixing, continue stirring until a uniform sol is formed;

[0047] Add 48g of activated magnesium oxide and 70g of deionized water to another beaker equipped with a stirrer, stir evenly, transfer to the above-mentioned sol, and continue stirring for 4 hours to obtain the first slurry;

[0048] Mix 6.5g of lanthanum nitrate with 10g of deionized water, stir until the solution is transparent, add ammonia water dropwise to adjust the pH value of the solution to 7, obtain an aqueous solution containing lanthanum, and then transfer it to the above-mentioned first slurry to form the second slurry, Stir the second slurry at a constant temperature of 70°C, spray dry the second slurry after 4 hours, and roast ...

Embodiment 3

[0053] The preparation method of the denitration catalyst described in this embodiment comprises the following steps:

[0054] (1) Add 170g deionized water and 74g pseudo-boehmite to a beaker equipped with a stirrer, stir, add 185g of an aqueous solution containing 25wt% nitric acid after mixing, and continue stirring until a uniform sol is formed;

[0055] Add 37g of light magnesium oxide and 50g of deionized water into another beaker equipped with a stirrer, stir evenly, transfer to the above-mentioned sol, and continue stirring for 3 hours to obtain the first slurry;

[0056] Mix 23g of cerium nitrate with 63g of deionized water, stir until the solution is transparent, then add ammonia water dropwise to adjust the pH value of the solution to 7 to obtain a cerium-containing aqueous solution, then transfer it to the above-mentioned first slurry to form the second slurry, and keep the temperature constant stirring the second slurry at 65°C, spray-drying the second slurry after...

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Abstract

The invention provides a denitration catalyst and a preparation method thereof. The denitration catalyst comprises a carrier and active components, wherein the carrier is magnesia-alumina spinel modified with the first rare earth elements, and the active components comprise palladium oxide and iron oxide; in terms of the total weight of the denitration catalyst, palladium oxide accounts for 1wt%-8wt%, iron oxide accounts for 2wt%-5wt%, oxide of the first rare earth elements accounts for 5wt%-15wt%, magnesia accounts for 20wt%-40wt%, and alumina accounts for 18wt%-67wt% ; the first rare earth elements are one or more of lanthanum, cerium, praseodymium, samarium, europium, terbium and dysprosium. The denitration catalyst has quite high denitration capacity under the specific material composition and ratio, the NO conversion rate of the denitration catalyst can be as high as 92%, and the denitration catalyst can resist poisoning of SO2 at the high temperature and has good SO2 poisoning resistant capacity.

Description

technical field [0001] The invention belongs to the technical field of petroleum refining, and in particular relates to a denitrification catalyst for removing nitrogen oxides in regenerated flue gas from catalytic cracking and a preparation method thereof. Background technique [0002] Fluid catalytic cracking (FCC) is one of the important processes in the secondary processing of petroleum. It is a process in which heavy oil undergoes cracking reaction under the action of high temperature and catalyst, and is transformed into cracked gas, gasoline and diesel oil. The coke generated in the FCC process will be deposited on the catalyst, resulting in deactivation of the catalyst. At this time, the deactivated catalyst needs to be sent to the regenerator, and the deposited coke will be burned off with the help of oxygen in the air to restore the catalysis of the deactivated catalyst. activity to regenerate the catalyst. [0003] However, as the content of heteroatoms such as s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J37/02B01D53/86B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2258/0283B01J23/8906B01J23/8946B01J37/0207B01J2523/00B01J2523/22B01J2523/31B01J2523/824B01J2523/842B01J2523/3712B01J2523/3706B01J2523/48B01J2523/3737B01J2523/3756B01J2523/3718B01J2523/3743
Inventor 陈玲玲闻学兵赵素云刘聪
Owner SHENYANG SANJUKAITE CATALYST
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