Low-vanadium denitration catalyst and preparation method and application thereof

A denitration catalyst, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of pollution, high catalyst cost, and high toxicity of precursors, and achieve the effect of improving performance

Active Publication Date: 2009-12-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the actual use of this technology. First, the cost of the catalyst is relatively high; sec

Method used

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  • Low-vanadium denitration catalyst and preparation method and application thereof
  • Low-vanadium denitration catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: 0.1 wt% V 2 o 5 -6wt% WO 3 -1wt%CeO 2 / TiO 2 Preparation of Composite Metal Oxide Catalysts

[0019] a) Add 0.5g of oxalic acid into 20mL of deionized water, stir to dissolve, then add 0.0064g of ammonium metavanadate and 0.3379g of ammonium paratungstate in turn, heat and stir in a water bath at 40°C for 10 minutes, and form a transparent solution

[0020] b) dissolving 0.1261g of cerium nitrate in oxalic acid solution to form a solution, and then adding dropwise into the solution prepared in step a) to form a flocculent precipitate, heating and stirring in a water bath at 40°C for 30 minutes;

[0021] c) Then slowly add 4.645g of titanium dioxide powder to the solution in step b), and add a small amount of deionized water appropriately, and stir evenly for 1 hour to obtain a white slurry;

[0022] d) Put the slurry obtained in step c) into an ultrasonic cleaning machine and ultrasonically impregnate it for 2 hours, then dry it in an oven at 110°C for 1...

Embodiment 2

[0024] Example 2: 0.1 wt% V 2 o 5 -6wt% WO 3 -5wt%CeO 2 / TiO 2 Preparation of Composite Metal Oxide Catalysts

[0025] a) Add 0.5g of oxalic acid to 20mL of deionized water, stir to dissolve, then add 0.0064g of ammonium metavanadate and 0.3379g of ammonium paratungstate in turn, and heat and stir in a water bath at 40°C for 10 minutes to form a transparent solution

[0026] b) dissolving 0.6307g of cerium nitrate in the oxalic acid solution to form a solution, and then adding dropwise into the solution prepared in step a) to form a flocculent precipitate, heating and stirring in a water bath at 40°C for 30 minutes;

[0027] c) Then slowly add 4.445g of titanium dioxide powder to the solution in step b), and add a small amount of deionized water appropriately, and stir evenly for 1 hour to obtain a white slurry;

[0028] d) Put the slurry obtained in step c) into an ultrasonic cleaning machine and ultrasonically impregnate it for 2 hours, then dry it in an oven at 110°C for...

Embodiment 3

[0030] Example 3: 0.1 wt% V 2 o 5 -6wt% WO 3 -10wt%CeO 2 / TiO 2 Preparation of Composite Metal Oxide Catalysts

[0031] a) Add 0.5g of oxalic acid into 20mL of deionized water, stir to dissolve, then add 0.0064g of ammonium metavanadate and 0.3379g of ammonium paratungstate in turn, heat and stir in a water bath at 40°C for 10 minutes, and form a transparent solution

[0032] b) dissolving 1.2614g of cerium nitrate in oxalic acid solution to form a solution, and then adding dropwise to the solution prepared in step a) to form a flocculent precipitate, heating and stirring in a water bath at 40°C for 30 minutes;

[0033] c) Then slowly add 4.195g of titanium dioxide powder to the solution in step b), and add a small amount of deionized water appropriately, and stir evenly for 1 hour to obtain a white slurry;

[0034] d) Put the slurry obtained in step c) into an ultrasonic cleaning machine and ultrasonically impregnate it for 2 hours, then dry it in an oven at 110°C for 12...

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Abstract

The invention relates to a low-vanadium denitration catalyst and a preparation method and application thereof, and belongs to the technical fields of environmental materials, environmental catalysis and environmental protection. The catalyst is prepared by a co-immersion method by adopting anatase titanium dioxide as a carrier, vanadium pentoxide as a main active component and tungstic oxide and cerium oxide as minor active components. Moreover, the low-vanadium denitration catalyst is characterized in that the catalyst reduces both the dosage of highly toxic vanadium and cost, and also has a conversion rate of NOx higher than 90 percent within a temperature range from 200 to 450 DEG C. The method provided for reducing nitrogen oxide comprises the following steps: putting the catalyst in a fixed bed reactor and controlling the reaction temperature between 200 and 500 DEG C; and taking NH3 as a reducing agent and controlling air speed at 28,000h and total gas flow at 300ml/min. The low-vanadium denitration catalyst still maintains high conversion rate of NOx in the presence of water and sulfur dioxide, and is suitable for treating NOx in exhaust gases discharged from thermal power plants, smelting plants, oil plants, and the like.

Description

technical field [0001] The invention relates to a catalyst suitable for treating NOx in waste gas discharged from thermal power plants, smelters, oil refineries, etc. and a preparation method thereof, belonging to the technical fields of environmental materials, environmental catalysis and environmental protection. Background technique [0002] Nitrogen oxides are the main pollution source of the atmosphere. It not only causes acid rain, photochemical smog and other problems that damage the earth's ecological environment, but also seriously endangers human health. Therefore, how to effectively eliminate nitrogen oxides has become an important topic of concern in the field of environmental protection. Ammonia selective catalytic reduction (selective catalytic reduction, SCR) has become the mainstream denitrification technology for stationary sources such as thermal power plants due to its maturity and high efficiency, and its core problem lies in the development of catalysts....

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/22B01J23/10B01J37/34B01J37/02B01J37/08B01D53/88B01D53/56
Inventor 李俊华陈亮郝吉明
Owner TSINGHUA UNIV
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