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Exhaust-gas purifying catalyst compound, catalyst comprising said compound and method for preparing the compound

A technology for purifying exhaust gas and catalysts, applied in the direction of catalyst activation/preparation, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve problems such as difficult effects, and achieve the effect of simplifying the preparation method and low affinity

Inactive Publication Date: 2003-11-12
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] but it's hard to say that we're getting enough effect from these methods

Method used

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  • Exhaust-gas purifying catalyst compound, catalyst comprising said compound and method for preparing the compound
  • Exhaust-gas purifying catalyst compound, catalyst comprising said compound and method for preparing the compound
  • Exhaust-gas purifying catalyst compound, catalyst comprising said compound and method for preparing the compound

Examples

Experimental program
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Effect test

Embodiment 1

[0051] By adding 40.6g molybdenum trioxide (MoO 3 ) and 49.4g ammonium metavanadate (NH 4 VO 3 ) The resulting slurry was gently stirred at room temperature for 20 hours to allow the two compounds to react with each other and dissolve completely in water. In the solution thus obtained, the concentration of the Mo-V compound was about 18% by weight, and the ratio of V atoms to Mo atoms (V / Mo) in said compound was 3 / 2. The reddish-brown substance thus formed and dissolved in water can be represented by the structural formula (NH 4 ) 3 Mo 2 V 3 o 15 To represent.

Embodiment 2

[0060] Impregnate a network with a slurry containing 40% titanium dioxide, 20% silica sol and 1% polyvinyl alcohol, and then dry it at 150°C to obtain a catalyst substrate with a certain stiffness. The network is obtained by rubbing Combined yarns each containing 1400E glass fibers with a fiber diameter of 9 μm were woven into a plain weave at a roughness of 10 yarns / inch.

[0061] On the other hand in an additional step the 1.5kg specific surface area is about 230m 2 / g of titanium dioxide was added to 75 g of oxalic acid, water was added thereto to form a paste, and then 300 g of silica·alumina fibers were added thereto and kneaded until a uniform paste was obtained.

[0062] The paste thus obtained was placed between the two catalyst substrates obtained in the above step, and they were passed through press rolls to obtain a sheet having a thickness of 0.7 mm and containing titanium dioxide. This sheet was dried at room temperature and then calcined at 400°C for 2 hours to ob...

Embodiment 3 to 6

[0070] Each catalyst was prepared by calcining the same catalyst as that obtained in Example 2 at 200, 300, 400 and 500° C. for two hours, respectively.

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Abstract

An exhaust gas purifying catalyst compound whichis represented by a rational formula: (NH4)xMo2VxO3(3x+6) (wherein x is 2.8 to 3.2) and has a V / Mo atomic ratio of 3 / 2; and a method for preparing the catalyst compound, characterized as comprising reacting molybdenum oxide (MoO3) with ammonium metavanadate (NH4VO3) in the presence of water for a specific period of time. The catalyst is prepared without employed the activation by firing, which has been the obstacle to achieving high catalyst activity in the prior art, while realizing satisfactory complex formation of V and Mo, and thus is markedly enhanced in activity, especially at a low temperature, and also in durability.

Description

technical field [0001] The present invention relates to catalysts for purifying exhaust gases. More specifically, the present invention relates to low temperature activity and resistance to SO x Excellent performance in terms of ammonia (NH 3 ) to nitrogen oxides (NO X ) is a catalyst with high activity in the reduction reaction and the oxidation decomposition reaction of dioxins, and relates to a preparation method of the catalyst. Background technique [0002] NO contained in exhaust gas or flue gas discharged from power plants, various factories, automobiles, etc. X It is a reagent that causes photochemical smog and acid rain. as removal of NO X An effective method using ammonia (NH 3 ) as a reducing agent, the method of denitrification of exhaust gas or flue gas by selective catalytic reduction has been widely used, and the method is most often used in thermal power plants. As catalysts used in such exhaust gas or flue gas denitrification methods, titanium dioxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/94B01J21/06B01J21/12B01J23/00B01J23/22B01J23/28B01J27/24B01J31/12B01J37/02C01G39/00
CPCB01J27/24B01D2255/20723B01J23/28B01J23/002B01D53/86C01P2006/12B01D2255/20707B01J23/22B01D53/865C01P2006/82C01P2004/80B01J21/12B01J37/0213B01D53/8628B01D2255/20769B01J21/063C01P2006/60C01P2006/80C01G39/006B01J2523/00B01J2523/55B01J2523/68B01J2523/41
Inventor 加藤泰良横山公一藤泽雅敏
Owner MITSUBISHI HITACHIPOWER SYST LTD
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