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Catalyst for low-temperature SCR denitrification in cement industry and preparation method thereof

A cement industry and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., to achieve the effects of environmental friendliness, high-efficiency low-temperature SCR denitrification activity, and wide activation temperature range

Active Publication Date: 2019-07-02
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is aimed at the current situation and existing problems of denitrification in the existing cement industry, and proposes a catalyst for low-temperature SCR denitrification in the cement industry. Another purpose of the present invention is to provide a preparation method for the above-mentioned catalyst, which is especially suitable for the existing SNCR denitrification cement Deep denitrification of low-temperature flue gas in the plant

Method used

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  • Catalyst for low-temperature SCR denitrification in cement industry and preparation method thereof
  • Catalyst for low-temperature SCR denitrification in cement industry and preparation method thereof
  • Catalyst for low-temperature SCR denitrification in cement industry and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of active component precursor solution

[0032] Weigh 1.26g of ferric nitrate nonahydrate, add 6.30g of deionized water and place in a 40°C constant temperature water bath and stir for 20min until the solution is clear and transparent to obtain the active component precursor solution;

[0033] (2) Co-catalyst precursor ion solution configuration

[0034] Take by weighing 20.58g manganese nitrate solution and add 3.16g deionized water to mix, then stir to obtain co-catalyst precursor ion solution;

[0035] (3) Preparation of catalyst carrier

[0036] Weigh 30.00g titanium dioxide and 20.00g alumina and stir evenly as catalyst carrier;

[0037] (4) Weighing of molding additives

[0038] Take by weighing 0.25g carboxypropyl methylcellulose as molding additive;

[0039] (5) According to the weight of the carrier as 100%, the three mass percentages of the active component oxide, the cocatalyst oxide and the molding additive are respectively 1%, 10%, and 0...

Embodiment 2

[0044] (1) Preparation of active component precursor solution

[0045] Weigh 1.68g of ferric chloride hexahydrate, add 2.52g of deionized water, place in a constant temperature water bath at 60°C and stir for 20min until the solution is clear and transparent to obtain the active component precursor solution;

[0046] (2) Co-catalyst precursor ion solution configuration

[0047] Take by weighing 20.58g manganese nitrate solution and add 2.06g deionized water to mix, then stir to obtain co-catalyst precursor ion solution;

[0048] (3) Preparation of catalyst carrier

[0049] Take by weighing 50.00g titanium dioxide as catalyst carrier;

[0050] (4) Weighing of molding additives

[0051] Take by weighing 0.15g carboxymethyl cellulose and 0.10g glycerol as molding additives;

[0052] (5) According to the weight of the carrier as 100%, the three mass percentages of the active component oxide, the cocatalyst oxide and the molding additive are respectively 2%, 10%, and 0.5%, and ...

Embodiment 3

[0057] (1) Preparation of active component precursor solution

[0058] Weigh 5.04g of ferric nitrate nonahydrate, add 5.04g of deionized water, place in a constant temperature water bath at 40°C and stir for 30min until the solution is clear and transparent to obtain the active component precursor solution;

[0059] (2) Co-catalyst precursor ion solution configuration

[0060] Take by weighing 10.29g manganese nitrate solution and add 4.12g deionized water to mix, then stir to obtain co-catalyst precursor ion solution;

[0061] (3) Preparation of catalyst carrier

[0062] Weigh 60.00g titanyl sulfate and 26.67g pseudo-boehmite and stir evenly as catalyst carrier;

[0063] (4) Weighing of molding additives

[0064] Weigh 0.15g carboxymethyl cellulose and 0.10g acetamide as molding additives;

[0065] (5) According to the weight of the carrier as 100%, the three mass percentages of the active component oxide, the cocatalyst oxide and the molding additive are respectively 4%,...

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Abstract

The invention relates to a catalyst for low temperature SCR denitration in cement industry and a preparation method thereof. The catalyst adopts lanthanum oxide and / or iron oxide as the catalytic active components, adopts manganese oxide or a mixture of yttrium oxide and / or praseodymium oxide and manganese oxide as the cocatalyst, and employs titanium dioxide and / or alumina as the carrier. On the basis of the carrier mass, the mass percentage content of the active components is 0.5%-15%, and the mass percentage content of the cocatalyst is 5%-35%. The preparation method consists of: stirring the active components, a cocatalyst ion precursor composite solution, the carrier and an organic forming agent evenly, carrying out mulling, ageing and extrusion molding, and then conducting drying and roasting, thus obtaining the catalyst. The catalyst has the advantages of environment-friendly components, high NOx removal efficiency at low temperature, wide active temperature window, high mechanical strength, simple preparation process, and low cost. At 130DEG C, the SCR denitration efficiency is greater than 85%, in the temperature range of 170-250DEG C, the denitration efficiency is greater than 94%, and can reach a maximum of 99.8%. The catalyst provided by the invention has high cost performance, and is especially suitable for low temperature flue gas denitration in cement plants.

Description

technical field [0001] The invention relates to a catalyst for low-temperature SCR denitrification in the cement industry and a preparation method thereof, which belongs to the field of environmental protection catalytic materials and air pollution control, and is particularly suitable for low-temperature flue gas denitrification in the cement industry. Background technique [0002] Nitrogen oxides (NO x ) is one of the causes of pollutants such as smog and acid rain, which seriously endangers human health and the ecological environment. Cement plant NO x Emissions are second only to coal-fired power plants, becoming a key industry for air pollution control. At present, the denitrification technology in the cement industry is mainly selective non-catalytic reduction (SNCR), which has low denitrification efficiency, severe ammonia escape, and high operating costs. Therefore, there is an urgent need to develop efficient and low-cost denitrification technology for the cement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J23/34B01D53/90B01D53/56
CPCB01D53/56B01D53/90B01D2251/2062B01D2255/40B01D2258/0233B01J23/002B01J23/34B01J23/8892B01J2523/00B01J2523/31B01J2523/47B01J2523/72B01J2523/842B01J2523/3706B01J2523/3718B01J2523/36
Inventor 沈岳松金奇杰祝社民沈晓冬
Owner NANJING TECH UNIV
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