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Magnetic catalyst for denitration of NH3-SCR smoke and application thereof

A technology of NH3-SCR and magnetic materials, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, climate sustainability, etc., to achieve gas-solid contact reduction, good regulation and control characteristics, The effect of low raw material cost

Active Publication Date: 2013-05-08
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, subject to technical bottlenecks such as catalyst molding, it can be predicted that the above-mentioned catalysts are still a long way from industrial applications.

Method used

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  • Magnetic catalyst for denitration of NH3-SCR smoke and application thereof
  • Magnetic catalyst for denitration of NH3-SCR smoke and application thereof
  • Magnetic catalyst for denitration of NH3-SCR smoke and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The nitrate of lanthanum and manganese is prepared according to the catalyst chemical formula LaMnO 3 The atomic ratio is made into an aqueous solution, and the mixed salt solution is added dropwise to the citric acid aqueous solution while stirring in a water bath at 30°C. The molar number of citric acid in the solution is equal to the molar number of lanthanum added. Continue to stir for 30 minutes after the dropwise addition, then concentrate the solution to gel, and then move it to a 110°C oven to dry for 12 hours to obtain a loose solid, then decompose it in the air at 500°C for 2 hours, and finally calcinate it at 800°C for 8 hours in an air atmosphere. After cooling, the desired catalyst carrier is obtained. Preliminary magnetic tests were carried out on the prepared catalyst carrier with a magnet, and it was found that the catalyst carrier was magnetic. ICP and EDX determine the elemental composition of the carrier as shown in Table 1, indicating that the carri...

Embodiment 2

[0037] The nitrate of lanthanum, potassium, manganese is prepared by the catalyst chemical formula La 0.8 K 0.2 MnO 3 The atomic ratio is made into an aqueous solution, and the mixed salt solution is added dropwise to the citric acid aqueous solution while stirring in a water bath at 30°C. The molar number of citric acid in the solution is equal to the molar number of lanthanum added. Continue to stir for 30 minutes after the dropwise addition, then concentrate the solution to gel, and then move it to a 120°C oven to dry for 12 hours to obtain a loose solid, then decompose it in the air at 500°C for 2 hours, and finally calcinate it at 900°C for 6 hours in an air atmosphere. After cooling, the desired catalyst carrier is obtained. Preliminary magnetic tests were carried out on the prepared catalyst carrier with a magnet, and it was found that the catalyst carrier was magnetic. ICP and EDX determine the elemental composition of the support as shown in Table 2, indicating tha...

Embodiment 3

[0044]The nitrate of lanthanum, copper, manganese is prepared according to the catalyst chemical formula LaCu 0.2 mn 0.8 o 3 The atomic ratio is made into an aqueous solution, and 28wt% ammonia water is used as a precipitating agent for dropwise addition, and the final pH value is controlled at about 10. After the precipitate was aged for 10 hours, it was suction-filtered, washed with deionized water, and washed 3 times with absolute ethanol, dried in an oven at 120°C for 12 hours, and the obtained sample was calcined at 800°C for 4 hours in an air atmosphere, and the required catalyst carrier was obtained after cooling . Preliminary magnetic tests were carried out on the prepared catalyst carrier with a magnet, and it was found that the catalyst carrier was magnetic. ICP and EDX determine the elemental composition of the support as shown in Table 3, indicating that the support structure is LaCu 0.2 mn 0.8 o 3 .

[0045] Table 3 Carrier ICP and EDX test report

[0046]...

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Abstract

The invention discloses a magnetic catalyst for denitration of NH3-SCR smoke. The NH3-SCR active component of the catalyst is magnetic iron oxide; and a carrier is perovskite type lanthanum-manganese metal oxide composite or lanthanum of which lanthanum and manganese are partially replaced by alkali metal and transition metal. The invention also discloses application of the catalyst in denitration of NH3-SCR smoke. A magnetic fluid bed reactor with coupling magnetic induction of 0.01-0.1 T is adopted to add the magnetic catalyst at an air speed of 4,000-6,000 h-1; and high NH3-SCR reaction activity is always shown under the conditions that the NH3 / NO molar ratio is 1.0-1.3, the O2 content is 2-12% and a relatively wide range of reaction temperature is from 200 DEG C to 400 DEG C, and the denitration is over 80%. Due to relatively wide range of reaction temperature, various dedusting ways are available for the catalyst, and the method is NH3-SCR technology suitable for low and medium temperature.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to 3 -Magnetic material catalyst for SCR flue gas denitrification and its application. Background technique [0002] Among the existing flue gas denitrification technologies, the most mature and commercially applied is the selective catalytic reduction method (NH 3 -SCR), which can be expressed as Reactive gas-solid reaction mode. More than 90% NO in flue gas x is NO, if the flue gas NO x Medium NO 2 / (NO+NO 2 ) volume ratio (degree of oxidation) increased to about 50%, NH 3 -SCR reaction rate will be greatly accelerated, using about 5% O in the flue gas itself 2 Partial oxidation of NO to NO 2 It is a good process route, but the reaction rate is extremely slow at this temperature, and it needs to be catalyzed by oxidation, that is, with O 2 As an oxidant, the selective catalytic oxidation of NO (O 2 -SCO) to speed up the reaction rate. [0003] It is well known tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/90B01D53/56
CPCY02C20/10
Inventor 吴忠标莫建松鞠耀明程常杰程斌
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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