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Ammonia decomposition catalyst

A technology of ammonia decomposition and catalyst, which is applied in molecular sieve catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc. It can solve the problems of NH3 conversion reduction and achieve high durability, excellent initial activity, and high NH3 decomposition rate.

Active Publication Date: 2018-12-18
NIKKI UNIVERSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been recorded in laboratory experiments that by setting the SCR layer, NO formation is reduced and N 2 selectivity, but as a whole, NH 3 Conversions are also reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0122] Hereinafter, the present invention will be described in more detail through examples. However, the present invention is not limited to these Examples.

[0123] (preparation of catalyst)

[0124]

[0125] In an evaporating dish, TiO was added to an aqueous solution of dinitrosodiammine platinum (Pt concentration: 4.5% by weight) 2 Powder (manufactured by Ishihara Sangyo Co., Ltd., average particle size: 1 μm, BET specific surface area: 60 m 2 / g), so that TiO 2 The powder is fully impregnated with the aqueous solution. Then, at a temperature of 80 to 90° C., the water was evaporated while stirring, and dried. Then, it heated to 150 degreeC further in a dryer. The obtained powder was calcined in air at a temperature of 500°C for 1 hour to obtain TiO loaded with 5.0% by weight of Pt (calculated as metal components). 2 particles (denote it as Pt(5.0) / TiO 2 ). This powder and 64.4 g of deionized water were mixed to prepare a slurry. This slurry was mixed with 249 ...

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Abstract

The invention relates to an ammonia decomposition catalyst and a purification method for ammonia waste gas with relatively high water content. An ammonia decomposition catalyst is a catalyst for treating ammonia waste gas containing moisture, which includes: a lower layer, which has noble metals, inorganic oxides, phosphorus, first proton zeolite, or reacts with Cu, Co or Fe ions an ion-exchanged first ion-exchange-type zeolite; and an upper layer provided on the above-mentioned lower layer and having a second proton-type zeolite or a second ion-exchange-type zeolite ion-exchanged with Cu, Co, or Fe ions.

Description

technical field [0001] The invention relates to an ammonia decomposition catalyst and a treatment method for waste gas containing ammonia (ammonia waste gas). More specifically, the present invention relates to an ammonia decomposition catalyst used for ammonia waste gas with a high moisture content. Background technique [0002] NH 3 Gas and ammonia are widely used in industrial applications, such as NH in sewage treatment 3 Nitrogen or containing NH used in the particle removal process in semiconductor manufacturing 3 waste water, etc. [0003] However, NH 3 Gas is a substance with a pungent smell. When it is released into the atmosphere, the discharge amount is regulated by the Bad Odor Prevention Act, and when discharged as wastewater (waste water), it becomes a substance that increases BOD, so the discharge amount is regulated by the Water Pollution Prevention Act. [0004] as removal containing NH 3 NH in the effluent (wastewater) of 3 methods, such as known to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/76B01D53/86B01J29/85
CPCB01J37/0246B01J23/42B01J29/072B01J29/7615B01D2255/20738B01D2255/20746B01D2255/20761B01D2255/502B01D2255/9022Y02C20/10B01D2255/50B01D2258/0283B01D53/8634Y02E60/36B01J35/19B01J29/85
Inventor 生驹知央梨子田敏也樱井孝信
Owner NIKKI UNIVERSAL CO LTD