Mn-Ce supported low temperature denitration catalyst and preparation method thereof

A low-temperature denitrification and load-type technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as complex control steps, microstructure changes, and pore structure collapse, so as to avoid grain growth. Large, crystal-shaped and controllable, well-dispersed effects

Active Publication Date: 2016-05-11
WUHAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

But currently, CeO 2 It is mainly used as a carrier additive; and the common preparation methods of supported metal oxide catalysts are generally precipitation method, sol-gel method and impregnation method, etc. In the preparation process of these methods, many factors need to be considere

Method used

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Effect test

Embodiment 1

[0025] A kind of Mn-Ce load type low-temperature denitration catalyst, its preparation method comprises the following steps:

[0026] 1) Preparation of cerium oxide: Dissolve 50g of cerium nitrate, 15g of urea and 1g of PAA in 200ml of distilled water, stir for 10 minutes and mix evenly, pour into the reactor after completely dissolving, heat to 160°C for 12h, and the obtained products are successively passed through Filtration, washing, drying (110°C, 6h), roasting at 400°C for 3 hours, and grinding to obtain nano ceria powder;

[0027] 2) Hydrothermal deposition of the active ingredient and the carrier: first add the nano-cerium oxide obtained in step 1) into a beaker of 100ml distilled water, and ultrasonically disperse in an ultrasonic cleaner for 10 minutes to obtain a mixed suspension; then add high Potassium manganate, manganese nitrate and glacial acetic acid, wherein the mol ratio of nano cerium dioxide, potassium permanganate, manganese nitrate and glacial acetic aci...

Embodiment 2

[0030] A kind of Mn-Ce load type low-temperature denitration catalyst, its preparation method comprises the following steps:

[0031] 1) Preparation of cerium dioxide: Dissolve 100g of cerium nitrate, 50g of urea and 5g of PAA into 400ml of distilled water, stir for 10 minutes and mix evenly, pour into the reactor after completely dissolving, heat to 90°C for 20h, and the obtained products are successively passed through Filtration, washing, drying (90°C, 18h), roasting at 500°C for 2 hours, and grinding to obtain nano ceria powder;

[0032] 2) Hydrothermal deposition of active ingredients and carriers: first, add nano ceria obtained in step 1) into a beaker of 100ml distilled water, disperse ultrasonically in an ultrasonic cleaner for 20 minutes, and mix to obtain a suspension, then add high manganese Potassium permanganate, manganese nitrate and glacial acetic acid, wherein the molar ratio of cerium dioxide, potassium permanganate and manganese nitrate is 1:0.2:0.1:0.05, and...

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Abstract

The invention discloses a Mn-Ce supported low temperature denitration catalyst and a preparation method thereof. The catalyst is mainly composed of cerium nitrate hexahydrate, urea, PAA, potassium permanganate, manganese nitrate, and glacial acetic acid; and is prepared by the following steps: preparing a cerium dioxide carrier and loading active components on the carrier through hydrothermal deposition. Common chemical reagents such as cerium nitrate, urea, and the like are used to prepare the nano cerium dioxide catalyst; the preparation process is simple and controllable; compared with the cerium dioxide purchased in the market, the catalyst has the advantages of good dispersing property, small particles, larger specific surface area, better oxygen storing and releasing ability, and strong antitoxin performance; the neutralization reactions between potassium permanganate and manganese nitrate are utilized, cerium dioxide is taken as the substrate to carry out redox reactions to obtain a mixture precipitate of manganese oxides and cerium dioxide, and then the mixture precipitate is subjected to a post treatment to obtain the supported manganese-based low temperature denitration catalyst. According to the preparation method, only a hydrothermal method is adopted, the related technology is simple, the cost is low, and the efficiency is high.

Description

technical field [0001] The invention belongs to the field of industrial flue gas treatment, and in particular relates to a Mn-Ce loaded low-temperature denitrification catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is a general term for various compounds of nitrogen and oxygen, mainly from flue gas discharged from stationary sources such as thermal power plants and motor vehicle exhaust, etc., and almost 95% (volume fraction) of NO in flue gas x It exists in the form of NO, so the conversion of NO is the removal of NO x key steps. to NO x Emission control includes two aspects: combustion process control and post-combustion flue gas denitrification. Among many denitrification technologies, selective catalytic reduction technology (SCR) is the most mature denitrification technology with the highest denitrification rate and the most applications. This technology uses ammonia or other reducing agents to selectively reduce NO ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/34
Inventor 谢峻林张哲何峰方德胡华李凤祥
Owner WUHAN UNIV OF TECH
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