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Ammonia gas purification catalyst

A catalyst, ammonia technology, applied in physical/chemical process catalysts, molecular sieve catalysts, catalyst activation/preparation and other directions, can solve the problems of difficulty in application, accelerate catalyst pulverization, affect the subsequent use of ammonia gas, etc., to improve service life, Reduce chance and overcome the effect of long purification process

Active Publication Date: 2022-04-01
大连华邦化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the deoxidizer is applied to ammonia, the existing copper element will complex with ammonia, which accelerates the pulverization of the catalyst and increases the copper ions in ammonia, which affects the subsequent use of ammonia, especially It is difficult to apply to electronic special gases with high requirements for copper ions

Method used

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  • Ammonia gas purification catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of ammonia purification catalyst of the present invention is prepared according to the following method successively:

[0026] a. Weigh 40g of nickel nitrate and 12g of magnesium nitrate and dissolve in 250g of deionized water, and use ultrasonic treatment for 2 hours; add 0.5g of Tween and stir for 1 hour, then add 195g of manganese nitrate solution with a mass concentration of 50%, and 160g of ferric nitrate, Lanthanum nitrate 9.5g, stirred for 1 hour to obtain a mixed solution;

[0027] b. Add 12 g of MCM-22 molecular sieves and continue to stir for more than 1 hour, add ammonia gas as a precipitant for precipitation, filter after the precipitation is complete, and dry to obtain a solid mixture;

[0028] c. pulverizing the solid mixture, adding an adhesive to carry out molding treatment, and obtaining a blank;

[0029] d. The billet is dried and calcined to obtain an ammonia purification catalyst.

Embodiment 2

[0031] A kind of ammonia purification catalyst of the present invention is prepared according to the following method successively:

[0032] a. Weigh 18g of basic nickel carbonate and 8g of basic magnesium carbonate, dissolve them in 100g of dilute nitric acid, and use ultrasonic treatment for 2 hours; add 0.5g of Tween and stir for 1 hour, then add 64g of manganese carbonate to obtain mixed solution A; then weigh Ferric nitrate 160g, lanthanum nitrate 9.5g are dissolved in 200g deionized water to obtain mixed solution B, mixed solution A and mixed solution B are mixed to form mixed solution;

[0033] b. Add 12 g of MCM-22 molecular sieves to the mixed solution and stir for more than 1 hour, add sodium carbonate as a precipitating agent for precipitation, filter after the precipitation is complete, and dry to obtain a solid mixture;

[0034] c. pulverizing the solid mixture, adding an adhesive to carry out molding treatment, and obtaining a blank;

[0035] d. The billet is dr...

Embodiment 3

[0037] a. Weigh 40g of nickel nitrate and 12g of magnesium nitrate and dissolve them in 250g of deionized water, and use ultrasonic treatment for 2 hours; add 0.5g of cetyltrimethylammonium bromide and stir for 1 hour; add manganese nitrate with a mass concentration of 50% 195 g of solution, 160 g of ferric nitrate, and 9.5 g of lanthanum nitrate were stirred for more than 1 hour to obtain a mixed solution;

[0038] b. Add 12 g of MCM-41 molecular sieves to the mixture and stir for more than 1 hour, add ammonia gas as a precipitant for precipitation, filter after the precipitation is complete, and dry to obtain a solid mixture;

[0039] c. pulverizing the solid mixture, adding an adhesive to carry out molding treatment, and obtaining a blank;

[0040] d. The billet is dried and calcined to obtain an ammonia purification catalyst.

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Abstract

The invention discloses an ammonia gas purification catalyst, which is composed of an active component, an auxiliary agent, a carrier and a binder according to a mass ratio of (5-75): (5-10): (10-55): (5-10), the active component is oxides of Ni, Fe and Mn, and the mass ratio is (5-10): (10-40): (5-30); the auxiliaries are oxides of Mg and La in a mass ratio of (1-8): (1-5), and the carrier is a molecular sieve; the preparation method comprises the following steps: dissolving a nickel salt and a magnesium salt in a solvent, treating in ultrasonic waves for at least 2 hours, adding a surfactant, stirring for at least 1 hour, adding a manganese salt, an iron salt and a lanthanum salt, and stirring for at least 1 hour to obtain a mixed solution; mixing and stirring the mixed solution and a molecular sieve for at least one hour, adding ammonia water or sodium carbonate, filtering after complete precipitation, and drying to obtain a solid mixture; the solid mixture is smashed, an adhesive is added for forming treatment, and a blank is obtained; and drying and roasting the blank to obtain the ammonia gas purification adsorbent.

Description

technical field [0001] The invention relates to the field of gas purification, in particular to an ammonia gas purification catalyst. Background technique [0002] With the rapid development of the semiconductor industry, ammonia is not only used as an etching gas, but also used to prepare nitrides such as aluminum, gallium, and indium, so the purity requirements for ammonia are getting higher and higher. The impurities in ammonia mainly include oil, metal ions, water, hydrogen, oxygen, carbon monoxide, carbon dioxide, methane, sulfide and particulate matter, etc. The purity of ammonia needs to be further purified in addition to improving the purity of synthesis gas (nitrogen and hydrogen) deal with. [0003] The traditional purification treatment mainly adopts the method of rectification to remove oil, a large amount of hydrogen, oxygen, carbon monoxide, carbon dioxide, methane, etc. in ammonia through rectification to obtain electronic grade ammonia of 5N~6N (99.999~99.99...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01J29/04B01J29/03B01J37/34C01C1/02
CPCY02P20/52
Inventor 侯鹏钱吉李文强
Owner 大连华邦化学有限公司