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A kind of middle and low temperature denitrification catalyst and preparation method thereof

A low-temperature denitrification and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of loss of activity, difficulty in applying industrial flue gas environment, catalyst deactivation, etc., to achieve Improved low-temperature activity, strong resistance to hydrothermal degradation, and high N2 selectivity

Active Publication Date: 2018-11-27
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These catalysts exhibit good low-temperature activity, but in SO 2 and H 2 In the presence of O, the catalyst is prone to severe deactivation
And for manganese-based catalysts, it is easy to generate metal sulfate and lose its activity, making it difficult to apply to the real industrial flue gas environment

Method used

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  • A kind of middle and low temperature denitrification catalyst and preparation method thereof
  • A kind of middle and low temperature denitrification catalyst and preparation method thereof
  • A kind of middle and low temperature denitrification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The components of the low-temperature denitration catalyst in this example are as follows:

[0035] 70 parts of ultrafine titanium dioxide, 5 parts of strontium-doped cerium-manganese perovskite composite oxide, 2 parts of vanadium pentoxide, 5 parts of tungsten trioxide, 6 parts of molybdenum trioxide, 5 parts of tin oxide, and 5 parts of glass fiber.

[0036] The specific preparation method of the above-mentioned medium and low temperature denitration catalyst is as follows:

[0037] 1) Preparation of strontium-doped cerium-manganese perovskite-type composite oxide: Dissolve 9.4g of strontium nitrate, 171.9g of cerium nitrate, and 165g of manganese nitrate into 3000L of deionized water, stir to dissolve completely and mix evenly; add 346.7g Citric acid is stirred to dissolve; add 110g of polyethylene glycol (20% aqueous solution), and stir to make it evenly mixed with the above substances; stir and react at 80°C for 4h in a constant temperature water bath until the vi...

Embodiment 2

[0043] The components of the low-temperature denitration catalyst in this example are as follows:

[0044] 60 parts of ultrafine titanium dioxide, 15 parts of strontium-doped cerium-manganese perovskite composite oxide, 2 parts of vanadium pentoxide, 5 parts of tungsten trioxide, 6 parts of molybdenum trioxide, 2 parts of tin oxide, and 5 parts of glass fiber.

[0045] The specific preparation method of the above-mentioned medium and low temperature denitration catalyst is as follows:

[0046] 1) Preparation of strontium-doped cerium-manganese perovskite-type composite oxide: Dissolve 8.5g of strontium nitrate, 156.3g of cerium nitrate, and 150g of manganese nitrate into 3000L of deionized water, stir to dissolve completely and mix evenly; add 315.2g citric acid and stir to dissolve it; add 100g of polyethylene glycol (20% aqueous solution), stir to make it mix with the above substances evenly; stir and react at 70°C for 5h in a constant temperature water bath until the viscos...

Embodiment 3

[0052] The components of the low-temperature denitration catalyst in this example are as follows:

[0053] 50 parts of ultrafine titanium dioxide, 25 parts of strontium-doped cerium-manganese perovskite composite oxide, 2 parts of vanadium pentoxide, 5 parts of tungsten trioxide, 6 parts of molybdenum trioxide, 1 part of tin oxide, and 5 parts of glass fiber.

[0054] The specific preparation method of the above-mentioned medium and low temperature denitration catalyst is as follows:

[0055] 1) Preparation of strontium-doped cerium-manganese perovskite-type composite oxide: Dissolve 7.7.g strontium nitrate, 140.7g cerium nitrate, and 135g manganese nitrate into 3000L deionized water, stir to dissolve completely and mix evenly; add 283.7g Add 120g of polyethylene glycol (20% aqueous solution) and stir to make it mix with the above substances; stir and react at 90°C for 3h in a constant temperature water bath until the viscosity of the reaction solution increases significantly,...

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Abstract

The invention provides a medium and low temperature denitration catalyst, and belongs to the technical field of denitration catalysts. The catalyst is prepared from ultrafine titanium dioxide, strontium-doped cerium manganese calcium titanium ore type composite oxides, vanadium pentoxide, tungsten trioxide, molybdenum trioxide and stannic oxide; glass fiber is used as an enhancing agent; carboxymethylcellulose and polyoxyethylene are used as bonding agents; stearic acid is used as a lubricating agent. The invention also relates to a preparation method of the medium and low temperature denitration catalyst. The concrete preparation method comprises the steps of preparation of the strontium-doped cerium manganese calcium titanium ore type composite oxides, preparation of carrier materials, preparation of powder catalysts, extrusion forming of honeycomb-shaped catalysts and post treatment of honeycomb-shaped denitration catalysts. The denitration catalyst prepared by the method has the advantages of high denitration efficiency, good sulfur-resistant and waterproof performance, reliable production process and the like in the wide temperature range from 180 DEG C to 350 DEG C; the requirements of oxynitride removal from industrial smoke gas in industries of coking, petrifaction, furnaces and the like can be met; wide application prospects are realized.

Description

technical field [0001] The invention belongs to the technical field of denitrification catalyst and air pollution control, and specifically relates to a medium-low temperature denitrification catalyst and a preparation method thereof. Background technique [0002] NOx is one of the main pollutants in the atmosphere. It has a series of hazards such as acid rain and photochemical smog, which seriously affect the ecological environment and human health. my country is a country with abundant coal resources, and the NOx produced by coal combustion is the main source of NOx emissions from human activities. Therefore, reducing NOx emissions is the top priority of pollution reduction in my country. Selective catalytic reduction (SCR) has been widely used because of its high denitrification efficiency, mature and reliable technology. [0003] At present, flue gas denitrification catalysts mainly focus on the development and application of medium temperature denitrification catalysts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/34B01J2523/00B01J2523/24B01J2523/23B01J2523/3712B01J2523/47B01J2523/43B01J2523/55B01J2523/68B01J2523/69B01J2523/72B01J2523/41
Inventor 胡洧冰李敬王蕾王磊张向辉
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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