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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  • Abstract
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  • Claims
  • Application Information

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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

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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

Example Embodiment

[0026] Example 1:

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

[0028] LaMnO prepared according to the process method of Example 1 3 / HNTs composite material XRD such as figure 1 Shown. It can be seen from the figure that the composite material maintains ...

Example Embodiment

[0032] Example 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, take the halloysite concentration 20g / L, weigh 5g sodium tripolyphosphate, 10ml dispersant methyl amyl alcohol, place it in a water bath at a constant temperature of 60℃, stir for 18h, and calcinate at 450℃ 3h, granulate, go through 40-60 mesh sieve, and dry to obtain 5% LaMnO 3 / HNTs.

[0034] The subsequent SCR denitrification test is as in Example 1, and the result shows that at 160° C., the nitrogen oxide removal rate of the composite material prepared in Example 2 reaches 82%.

Example Embodiment

[0035] Example 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, take the halloysite concentration 10g / L, weigh 5g of citric acid, 7ml of dispersant methylpentanol, place it in a water bath at a constant temperature of 60℃, stir for 18h, and calcinate at 450℃ for 3h. Granulate, pass through 40-60 mesh sieve, and dry to obtain 20% LaMnO 3 / HNTs.

[0037] Subsequent SCR denitration test is as in Example 1. The results show that at 160°C, the nitrogen oxide removal rate of the composite material prepared in Example 3 reaches 78%, which is slightly lower than that of the materials in Example 1 and Example 2. Part of the agglomeration occurs after the load increases, which affects 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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