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TiO2-WO3 composite nano powder and preparation method thereof, SCR denitration catalyst and flue gas denitration method

A denitration catalyst, tio2-wo3 technology, which is applied in the field of denitration, can solve the problems of low denitration efficiency of the denitration catalyst, small specific surface area of ​​nano-powder, long preparation process, etc., and achieves reduced operating conditions and equipment requirements, low cost and simple process. Effect

Active Publication Date: 2019-12-24
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the long preparation process flow of nano powder existing in the prior art, which needs to be reacted under high temperature and high pressure conditions, and the energy consumption is large; the prepared nano powder The specific surface area of ​​the powder is small, and the denitration efficiency of the denitration catalyst prepared by the nanopowder is low. Provide TiO2-WO3 composite nanopowder and its preparation method, SCR denitrification Catalyst and flue gas denitration method, the preparation method of the TiO2-WO3 composite nanopowder has simple process, low cost, and can be realized at relatively low temperature and normal pressure , the prepared TiO2-WO3 composite nanopowder has a high specific surface area, and the denitration catalyst prepared by the composite nanopowder has a high denitration efficiency

Method used

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  • TiO2-WO3 composite nano powder and preparation method thereof, SCR denitration catalyst and flue gas denitration method
  • TiO2-WO3 composite nano powder and preparation method thereof, SCR denitration catalyst and flue gas denitration method
  • TiO2-WO3 composite nano powder and preparation method thereof, SCR denitration catalyst and flue gas denitration method

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preparation example Construction

[0030] The first aspect of the present invention provides a TiO 2 -WO 3 The preparation method of composite nanopowder, wherein, the method comprises the following steps:

[0031] (1) cleaning and ball milling the waste denitration catalyst to obtain pulverized granules, and adding a strong alkali solution for hot alkali treatment and first filtration to obtain filter residue;

[0032] (2) pickling and washing the filter residue with water, and second filtering to obtain titanium-tungsten raw powder;

[0033] (3) Roasting the titanium-tungsten raw powder to obtain TiO 2 -WO 3 Composite nanopowder.

[0034] According to the method of the present invention, the waste denitration catalyst is a titanium-based vanadium-tungsten-based honeycomb, corrugated or flat-plate denitration catalyst.

[0035] According to the method of the present invention, the cleaning includes ultrasonic cleaning and rinsing, preferably, the time of the ultrasonic cleaning is 10-60 min, and the time ...

Embodiment 1

[0053] Clean the waste SCR denitrification catalyst ultrasonically for 60 minutes, then rinse it for 60 minutes, ball mill it to 200 mesh, take 100 g of the waste denitration catalyst after ball milling and put it in a 500 ml flask, add 100 ml of NaOH with a concentration of 30% by weight and react at 145°C for 3 hours , filter to obtain a filter residue, the filter residue is washed with a sulfuric acid solution with a concentration of 3% by weight at 30°C until the pH is 6, and then the filter residue is washed with deionized water until the conductivity is 100 μS / cm, and filtered to obtain titanium-tungsten Raw powder, the titanium-tungsten raw powder is calcined according to the following roasting system: from room temperature to 100°C at a constant temperature for 2 hours at a rate of 3°C / min; then at a rate of 3°C / min to 200°C for 2 hours at a constant temperature ; Then heat up to 400°C at a constant temperature for 2.5 hours at a rate of 2°C / min; finally heat up at a ra...

Embodiment 2

[0056] Ultrasonic cleaning of the waste SCR denitration catalyst for 30 minutes, then rinsing for 30 minutes, ball milling to 400 mesh, taking 100 g of ball milled waste denitration catalyst and placing it in a 1500ml flask, adding 1000ml of NaOH with a concentration of 20% by weight and reacting at 100°C for 5 hours , filter to obtain a filter residue, the filter residue is washed with a sulfuric acid solution having a concentration of 5% by weight at 100°C until the pH is 1, and then the filter residue is washed with deionized water until the conductivity is 38 μS / cm, and filtered to obtain titanium-tungsten Raw powder, the titanium-tungsten raw powder is calcined according to the following roasting system: from room temperature to 200°C at a constant temperature for 1 hour at a rate of 1°C / min; then at a rate of 1°C / min to 300°C for 1 hour at a constant temperature ; Then heat up to 450°C for 2 hours at a rate of 1°C / min; finally heat up to 850°C for 2 hours at a rate of 1°C...

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Abstract

The invention relates to the field of denitration, and discloses TiO2-WO3 composite nano powder, a preparation method thereof, an SCR denitration catalyst and a flue gas denitration method. The preparation method of the TiO2-WO3 composite nano powder comprises the following steps: (1) cleaning and ball-milling a waste denitration catalyst to obtain crushed granules, and adding a strong alkali solution to carry out hot alkali treatment and first filtration to obtain filter residues; (2) carrying out acid pickling and water washing on the filter residues, and carrying out second filtration to obtain titanium-tungsten raw powder; and (3) roasting the titanium-tungsten raw powder to obtain the TiO2-WO3 composite nano powder. The preparation method of the TiO2-WO3 composite nano-powder is simple in process and low in cost and can be achieved at a relatively low temperature and under normal pressure, the prepared TiO2-WO3 composite nano-powder has a relatively high specific surface area, anda denitration catalyst prepared from the composite nano-powder has relatively high denitration efficiency.

Description

technical field [0001] The invention relates to the field of denitrification, in particular to TiO 2 -WO 3 Composite nanopowder and its preparation method, SCR denitrification catalyst and flue gas denitrification method. Background technique [0002] Nitrogen oxides (NOx) are currently one of the main sources of air pollution in my country, which has brought serious harm to the ecological environment and human life. Currently, the most effective denitrification technology is the selective catalytic reduction (SCR) method, the key component of which is the denitrification catalyst, which will become a waste catalyst due to various reasons in the actual operation process. [0003] A large amount of spent denitrification catalysts are produced in my country every year, and catalysts that cannot be regenerated and damaged catalysts are hazardous wastes. The waste denitrification catalyst contains titanium dioxide: 80% to 90%, tungsten trioxide 5% to 10%, vanadium pentoxide 0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/90B01D53/56
CPCB01J23/30B01D53/90B01D53/8628B01D2255/20707B01D2255/20776B01D2258/0283Y02P10/20
Inventor 何发泉王宝冬刘子林林德海马少丹马静马子然王红妍孙琦徐文强李永龙孙永伟
Owner CHNA ENERGY INVESTMENT CORP LTD
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