Ozone oxidation ammonia gas catalyst, preparation method and application thereof

An ozone oxidation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, molecular sieve catalysts, etc., can solve the problem of low ammonia removal rate, high maintenance cost, light utilization problems such as low rate, to achieve the effect of improving dispersibility and moisture resistance, improving service life, and high specific surface area

Active Publication Date: 2021-06-25
718TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The absorption method is to use acidic agents to react with ammonia gas, which requires a large amount of chemical agents; the adsorption method is to use activated carbon and other adsorbents to adsorb ammonia gas, but the adsorption amount is small, frequent replacement, and high maintenance costs; the combustion method is mainly used for In industry, it is suitable for high-temperature and high-concentration organic waste gas, but not suitable for removing ammonia at room temperature; photocatalytic removal of ammonia requires light source and low light utilization rate, and the removal rate of ammonia is not high

Method used

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  • Ozone oxidation ammonia gas catalyst, preparation method and application thereof

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Comparison scheme
Effect test

Embodiment 1

[0033] After ball milling 5g of titanium dioxide and 88g of molecular sieve for 1h, roast at 450°C for 5h to form titanium dioxide / molecular sieve; add 6.43g of copper nitrate trihydrate, 6.17g of manganese nitrate, and 1.51g of ferric nitrate into 310ml of deionized water, stir Dissolve to obtain a metal salt solution, then add titanium dioxide / molecular sieve, continue to stir, dropwise add an ammonium carbonate solution with a mass fraction of 1%, until the pH value of the metal salt solution reaches 7.5, stop dripping the ammonium carbonate solution, and continue stirring for 4h, Let it stand at room temperature for 24 hours, wash the obtained precipitate with deionized water, filter, dry at 90°C for 4 hours, add 2g of carboxymethylcellulose as a binder, knead and extrude it, and then roast at 300°C for 3 hours to obtain ozone oxidation Ammonia catalyst.

[0034] According to the amount of the metal ion of the added metal salt, it can be known that the ozone oxidation ammo...

Embodiment 2

[0036] Mix 12g of titanium dioxide and 66g of molecular sieve by ball milling for 2h, then roast at 550°C for 5h to form titanium dioxide / molecular sieve; add 17.15g of copper nitrate trihydrate, 20.57g of manganese nitrate, and 6.04g of ferric nitrate into 970ml of deionized water, stir Dissolve to obtain a metal salt solution, then add titanium dioxide / molecular sieve, continue to stir, dropwise add a sodium bicarbonate solution with a mass fraction of 5%, until the pH value of the metal salt solution reaches 8.3, stop adding, continue to stir for 6h, at room temperature Let it stand for 24 hours, wash the obtained precipitate with deionized water, filter, dry at 120°C for 6 hours, add 2g of carboxymethylcellulose as a binder, knead and press it into tablets, then break it into 2mm ~ 3mm particles, and then dry it at 450 Calcined at ℃ for 6h to obtain an ammonia catalyst for ozone oxidation.

[0037] According to the amount of the metal ion of the added metal salt, it can be...

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Abstract

The invention relates to an ozone oxidation ammonia gas catalyst as well as a preparation method and application thereof, and belongs to the technical field of environment-friendly chemical industry. The catalyst is composed of a carrier, an active component and an auxiliary component. The carrier is a molecular sieve or activated carbon. The active component is copper oxide and / or manganese oxide. The auxiliary components are ferric oxide and titanium oxide. The preparation method of the catalyst comprises the following steps: adding salt of active components and and ferric salt into water, conducting stirring and dissolving to obtain a metal salt solution, adding a carrier and titanium dioxide into the solution, continuously conducting stirring, dropwise adding a precipitator into the solution to co-precipitate the salt of the active components and ferric salt, stopping dropwise adding the precipitator when the pH value of the metal salt solution reaches 7.5-8.3, washing the obtained precipitate with water, conducting filtering, drying and molding, and then conducting roasting at 300-450 DEG C for 3-6 hours to obtain the catalyst. The catalyst is combined with ozone for use, and can be applied to ammonia gas purification.

Description

technical field [0001] The invention relates to an ozone oxidation catalyst for ammonia gas, a preparation method and application thereof. The catalyst can combine ozone at room temperature to remove ammonia gas in the environment, and belongs to the technical field of environmental protection chemical industry. Background technique [0002] With the rapid development of social industrialization and the increasing frequency of human activities, the problem of environmental pollution has become increasingly serious. The decomposition of domestic waste and interior decoration, etc., cause the indoor ammonia and benzene content to exceed the standard, which seriously threatens human health. The effective degradation and treatment of various inorganic and organic pollutants is an urgent problem to be solved at present. [0003] Ammonia is a colorless gas with a pungent smell. After being inhaled into the lungs, it easily enters the blood through the alveoli, combines with hemogl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/00B01J23/889B01D53/86B01D53/58
CPCB01J23/8892B01J23/002B01J29/00B01D53/8634B01D2251/104B01J2523/00B01J2523/17B01J2523/47B01J2523/72B01J2523/842Y02A50/20
Inventor 魏文英林碧亮张纪领陈红香
Owner 718TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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