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Halloysite/lanthanon perovskite composite SCR catalyst and preparation method thereof

A technology of SCR catalyst and rare earth calcium, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the constraints on the industrial application and promotion of catalysts, and there is no high-efficiency SCR catalyst , affect the denitrification effect and other issues, and achieve the effect of facilitating catalytic activity, increasing lattice defects, and good gas permeability

Active Publication Date: 2015-06-24
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2012, Zhang Yibo and others published an article on Volume 33, Issue 9 of "Chinese Journal of Catalysis", pointing out that LaMnO 3 and BiMnO 3 There is a certain SCR denitrification activity at 100-240°C, but the applicant found that in the actual application process, these materials have the problems of low mechanical strength, high cost, and difficult recycling, which ultimately affects the denitrification effect and restricts the catalyst. Industrial application and further promotion
In recent years, there have been many reports on perovskite catalysts and halloysite as a catalyst carrier, but there is no report on the combination of the two used in low-temperature SCR denitrification, and there is no high-efficiency SCR catalyst in the low-temperature segment.

Method used

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  • Halloysite/lanthanon perovskite composite SCR catalyst and preparation method thereof
  • Halloysite/lanthanon perovskite composite SCR catalyst and preparation method thereof
  • Halloysite/lanthanon perovskite composite SCR catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1). Take 20g halloysite, dissolve it in 100mL deionized water, make the concentration of halloysite suspension be 10g / L, ultrasonic several minutes, add 2.69gLa(NO 3 ) 3 ·6H 2 O, 2.96g50%Mn(NO 3 ) 2 The solution was stirred and dissolved, and 3.48 g of citric acid was added into the mixed solution under continuous stirring, and 3 ml of dispersant ethylene glycol was added dropwise. It was placed in a water bath at a constant temperature of 80°C and reacted for 12 hours. Calcined at 550°C for 2 hours, granulated, passed through a 40-60 mesh sieve, and dried to obtain 10% LaMnO 3 / HNTs composite material, denoted as material A. The X-ray powder diffraction experiment was carried out on the obtained sample, and its morphology and structure were observed under a transmission electron microscope.

[0028] The LaMnO that prepares by embodiment 1 process method 3 / HNTs composite XRD such as figure 1 shown. It can be seen from the figure that the composite material ma...

Embodiment 2

[0033] Change La(NO 3 ) 3 ·6H 2 The amount of O is 1.35g, 50% Mn(NO 3 ) 2 The amount is 1.04g, the concentration of halloysite is 20g / L, weigh 5g sodium tripolyphosphate, 10ml dispersant methyl pentanol, put it in a water bath, keep the temperature at 60°C, stir for 18h, and calcined at 450°C 3h, granulate, pass through a 40-60 mesh sieve, and dry to obtain 5% LaMnO 3 / HNTs.

[0034] The follow-up SCR denitrification test was as in Example 1, and the results showed that at 160°C, the nitrogen oxide removal rate of the composite material prepared in Example 2 reached 82%.

Embodiment 3

[0036] Change La(NO 3 ) 3 ·6H 2 The amount of O is 1.35g, 50% Mn(NO 3 ) 2 The amount is 1.04g, the concentration of halloysite is 10g / L, 5g of citric acid and 7ml of dispersant methyl pentanol are weighed, placed in a water bath, kept at a constant temperature of 60°C, stirred for 18h, and calcined at 450°C for 3h. Granulate, pass through a 40-60 mesh sieve, and dry to obtain 20% LaMnO 3 / HNTs.

[0037] The follow-up SCR denitration test is as in Example 1. The results show that at 160°C, the nitrogen oxide removal rate of the composite material in Example 3 reaches 78%, and the effect is slightly lower than that of the materials in Example 1 and Example 2. It may be Partial agglomeration occurred after the loading increased, which affected the catalytic effect.

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Abstract

The invention belongs to the technical field of preparation of SCR catalysts in environment protection, and provides a halloysite / lanthanon perovskite composite SCR catalyst. The formula is ABO3 / HNTs, wherein A refers to a rear earth element, B is a metal cation, and HNTs is a halloysite nano tube carrier; the mass percentage of ABO3 is 5%-20%. According to the invention, the halloysite / lanthanon perovskite composite material is prepared by adopting a one-step sol-gel method; the perovskite particle size is less than 20nm, and the perovskite is uniform in load and relatively dispersive; the cost is reduced as well as the synergistic catalysis effect is developed; all metal cations in the liquid phase can be subjected to polymerization reaction by a complexing agent; a manganese ion and an aluminum ion which are contained in the carrier also can be involved in, which cannot be realized by coprecipitation of metal cations via adjusting the pH value. The manganese ion and the aluminum ion as well as lanthanon perovskite are doped, so that the lattice imperfection of an active component is increased, facilitating the improvement of the catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of SCR catalyst production in environmental protection, and in particular relates to a preparation method of halloysite / rare earth perovskite and its low-temperature SCR denitrification application. Background technique [0002] my country is a big coal-fired country, a large amount of dust generated by coal-fired power plants, SO x , NO x and harmful metal elements, seriously affecting the ecological environment of the earth and affecting human health. Nitrogen oxides are one of the main pollutants that cause acid rain and photochemical smog. After chemical reactions, nitrogen oxides NO will form NO 2 , O 3 with photochemical smog, where NO 2 There is a strong irritation to the human eyes and respiratory organs, which can cause pulmonary edema and death in severe cases. NO 2 It is also the main substance that forms acid rain, which can cause great harm to buildings and crops. Therefore, it is imperat...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01D53/86B01D53/56
Inventor 李霞章殷禹姚超罗士平陆晓旺左士祥刘文杰
Owner CHANGZHOU UNIV
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