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A low-temperature SCR denitrification catalyst with deliquescence resistance and preparation method thereof

A denitrification catalyst and anti-deliquescence technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to improve deliquescence resistance, improve physical service life, and good flexibility Effects on sex and plasticity

Active Publication Date: 2016-01-20
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The deliquescence resistance is the physical property of the catalyst, which is related to the physical structure of the catalyst, and can effectively resist moisture corrosion. The low-temperature SCR catalyst with deliquescence resistance has not been reported yet.

Method used

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  • A low-temperature SCR denitrification catalyst with deliquescence resistance and preparation method thereof
  • A low-temperature SCR denitrification catalyst with deliquescence resistance and preparation method thereof
  • A low-temperature SCR denitrification catalyst with deliquescence resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Dry mix. Weigh the dried carrier (titanium dioxide and nano-SiO 2 mixture of nano-SiO 2 The mass percentage is 5%) 400g, manganese oxalate 536g, cerium nitrate 520.8g, ferrous oxalate 144g, zirconium nitrate 101.7g (the manganese oxalate, cerium nitrate, ferrous oxalate, zirconium nitrate do not include the weight of crystal water , the same below), stearic acid 10g, put into the mixer together and dry blend for 20min.

[0030] 2) Granulation. Add 20 g of glycerin to the above solid powder, mix well, use a sprayer to spray an appropriate amount of deionized water, and the solid powder forms a granular form.

[0031] 3) Link particles. Add 50g of glass fiber and 2g of pulp cotton, stir for 15 minutes, and add appropriate amount of deionized water if necessary, subject to the fact that the particles become agglomerated;

[0032] 4) Adjust plasticity. Slowly add 16g of sodium carboxymethylcellulose, stir for 10 minutes and then add 2g of polyethylene oxide to prep...

Embodiment 2

[0037] 1) Dry mix. Weigh the dried carrier (titanium dioxide and nano-SiO 2 mixture of nano-SiO 2 The mass percentage is 10%) 400g, manganese oxalate 536g, cerium nitrate 347.2g, ferrous oxalate 90g, zirconium nitrate 67.8g, stearic acid 10g, put them into the mixer and dry mix them for 20min.

[0038] 2) Granulation. Add 20 g of glycerin to the above solid powder, mix well, use a sprayer to spray an appropriate amount of deionized water, and the solid powder forms a granular form.

[0039] 3) Link particles. Add 50g of glass fiber and 2g of pulp cotton, stir for 15 minutes, and add appropriate amount of deionized water if necessary, subject to the fact that the particles become agglomerated;

[0040] 4) Adjust plasticity. Slowly add 16g of sodium carboxymethylcellulose, stir for 10 minutes and then add 2g of polyethylene oxide to prepare a catalyst paste with excellent plasticity.

[0041] 5) The above catalyst paste is aged, extruded, dried and calcined to form the final...

Embodiment 3

[0044] 1) Dry mix. Weigh the dried carrier (titanium dioxide and nano-SiO 2 mixture of nano-SiO 2 The mass percentage is 8%) 400g, manganese oxalate 536g, cerium nitrate 173.6g, ferrous oxalate 36g, zirconium nitrate 33.9g, stearic acid 20g, put them into the mixer and dry mix them for 20min.

[0045] 2) Granulation. Add 30 g of glycerin to the above solid powder, mix evenly, use a sprayer to spray an appropriate amount of deionized water, and the solid powder is granulated.

[0046] 3) Link particles. Add 60g of glass fiber and 4g of pulp cotton, stir for 15 minutes, and add an appropriate amount of deionized water if necessary, subject to the fact that the particles become agglomerated;

[0047] 4) Adjust plasticity. Slowly add 12g of sodium carboxymethylcellulose, stir for 10 minutes and then add 4g of polyethylene oxide to prepare a catalyst paste with excellent plasticity.

[0048] 5) The above catalyst paste is aged, extruded, dried and calcined to form the final f...

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Abstract

The invention discloses a low-temperature SCR denitration catalyst with deliquescence-proof capability, and a preparation method thereof. The low-temperature SCR denitration catalyst is prepared by the following raw materials, based on 100 parts by weight of a carrier, 100 parts of the carrier, 67-134 parts of manganese oxalate, 43.4-130.2 parts of cerous nitrate, 9-36 parts of ferrous oxalate, 8.4-25.5 parts of zirconium nitrate, 2.5-12.5 parts of stearic acid, 13-33.5 parts of a structural assistant, 1-8 parts of a binding agent, 5-12.5 parts of an extrusion assistant and a proper amount of water. The low-temperature SCR denitration catalyst can effectively increase the deliquescence-proof capability of the catalyst in a humid environment and protect the catalyst from deliquescence and damages, thereby prolonging the physical service life of the catalyst.

Description

technical field [0001] The invention relates to the technical field of nitrogen oxide treatment, in particular to a low-temperature SCR denitrification catalyst with good deliquescence resistance in a water vapor environment and a preparation method thereof. Background technique [0002] SCR denitrification technology is the most widely used and most efficient technology for removing NOx from coal-fired boilers in power plants, kilns in cement plants, and waste incinerators. Among them, the denitrification catalyst is a key part of the implementation of this technology, generally made of titanium dioxide as a carrier, adding active substances and molding aids. According to the flue gas temperature applicable to the catalyst, the SCR process can be divided into three types: high temperature, medium temperature and low temperature. The applicable temperature of high-temperature SCR catalysts is generally above 450°C, the applicable temperature of medium-temperature SCR cataly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J35/10
Inventor 王岳军王瑞洋莫建松刘伟虞廷兴吴忠标
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH