SCR catalyst powder as well as preparation method and application thereof

An SCR catalyst and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of inability to remove CVOCs, limited improvement of denitration efficiency, etc., and achieve excellent denitration and synergistic removal of CVOCs. Active, wide active temperature window, high active effect

Active Publication Date: 2019-05-10
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, traditional SCR catalysts often cannot remove the function of CVOCs while denitrifying
[0006] In addition, the inventors also found that the existing low-temperature denitrification catalysts are often only the exploration of the preparation process without changing the traditional vanadium-tungsten-titanium system, and their improvement in denitrification efficiency is limited. If you want to realize SCR denitration on the surface of the catalyst At the same time, the oxidation of CVOCs still needs to be further explored on the composition and performance of the catalyst.

Method used

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  • SCR catalyst powder as well as preparation method and application thereof
  • SCR catalyst powder as well as preparation method and application thereof
  • SCR catalyst powder as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example 1-5

[0049] Preparation Example 1-5 Preparation of SCR Catalyst Powder

[0050] The raw materials include: tungsten phosphate, vanadyl acetylacetonate, titanium dioxide, and / or molybdenum trioxide, and the content of the raw materials in each preparation example is shown in Table 1 below.

[0051] Measure the raw materials as shown in Table 1 and mix them initially, then add them into a ball mill tank and carry out ball milling for 50 min at a speed of 60 rpm, then the ball milled mixture is dried (110°C, 6h) and roasted in an air atmosphere. Carried out in a muffle furnace, including heating at a rate of 5 °C / min to 95 °C for 5 min; then heating at a rate of 8 °C / min to 280 °C and maintaining for 10 min; then heating at a rate of 8 °C / min to 500 °C keep for 2 hours. After the calcination, it is cooled with the furnace to obtain SCR catalyst powder with a particle size of 40-80 mesh.

[0052] Table 1

[0053]

preparation example 7-11

[0054] Preparation Example 7-11 Preparation of SCR Catalyst Powder

[0055] According to the preparation method and dosage of Preparation Example 1, replace the phosphotungstic acid and / or vanadyl acetylacetonate in Preparation Example 1 with the substances shown in Table 2 to prepare catalyst powder (wherein, the dash "-" in the table represents Same as the tungsten source or vanadium source of Preparation Example 1).

[0056] Table 2

[0057] Preparation example

preparation example 12

[0058] Preparation Example 12 Preparation of SCR Catalyst Powder

[0059] Raw material consumption and composition are the same as Preparation Example 1, adopt the following preparation method:

[0060] Take the raw materials for preliminary mixing, and then put them into the ball mill tank for ball milling, ball milling for 40 minutes, the speed is 30 rpm; the ball milling mixture is taken out and dried at 110°C for 8 hours, and roasted in the air atmosphere: 10°C / min at room temperature to rapidly heat up to 110°C; Slowly raise the temperature at 2°C / min to 300°C; quickly raise the temperature to 500°C at 10°C / min, and keep it at 500°C for 4 hours; finally, cool with the furnace to obtain SCR catalyst powder.

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Abstract

The invention discloses SCR catalyst powder as well as a preparation method and application thereof. The catalyst adopts tungsten phosphate serving as a tungsten source precursor, vanadium acetylacetonate serving as a vanadium source precursor and TiO2 and/or MoO3 serving as a carrier as raw materials, wherein the vanadium content in the catalyst powder is not less than 2 percent by weight. The catalyst powder has high activity while maintaining dioxin oxidation degradation and SCR reaction, and has a wide active temperature window with a temperature span of 170 to 550 DEG C.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to an SCR catalyst powder and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Flue gases from waste incineration, steel sintering, and building materials kilns contain a large amount of nitrogen oxides (NO x ) and chlorine-containing volatile organic compounds (CVOCs, Chloride Volatile Organic Compounds) and other pollutants. Nitrogen oxides (NO x ) is one of the main pollutants of global air pollution, causing photochemical smog, acid rain, ozone layer destruction and other environmental problems, seriously affecting people's livi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/198B01J35/02B01D53/86B01D53/56B01D53/70
Inventor 王栋彭悦韩奎华路春美张亢
Owner SHANDONG UNIV
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