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Low-temperature SCR (Selective Catalytic Reduction) catalyst taking Pr-doped TiO2 as carrier and preparation method

An SCR catalyst, pr6o11-tio2 technology, applied in the field of SCR catalyst preparation, to achieve the effects of good denitration efficiency, uniform particle dispersion and simple preparation process

Active Publication Date: 2014-07-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no patents and literatures showing that a small amount of Pr is incorporated into TiO 2 In the lattice, load the active components and test their SCR activity

Method used

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  • Low-temperature SCR (Selective Catalytic Reduction) catalyst taking Pr-doped TiO2 as carrier and preparation method
  • Low-temperature SCR (Selective Catalytic Reduction) catalyst taking Pr-doped TiO2 as carrier and preparation method
  • Low-temperature SCR (Selective Catalytic Reduction) catalyst taking Pr-doped TiO2 as carrier and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 57.7 mL of tetrabutyl titanate with 66 mL of absolute ethanol and stir for 1 h to obtain solution A, and mix 19.5 mL of acetic acid with 33 mL of absolute ethanol for 1 h to obtain solution B. The solution B was slowly added dropwise to the solution A, the pH of the solution was adjusted to 2 by adding nitric acid, and the sol was obtained after stirring for 2 hours. After aging for 12h, dry at 100°C for 24h, and roast at 500°C for 4h to obtain 1#TiO 2 Carrier: In the oxalic acid solution in which 0.579g of ammonium metavanadate is dissolved, add 1.1g of ammonium molybdate and the above-mentioned 1# carrier, after ultrasonication in a water bath at 60°C for 2h, dry at 80°C for 12h, and roast at 450°C for 3h to obtain 1# catalyst , its Langmuir specific surface is 22m 2 / g.

Embodiment 2

[0024] Mix 56.5mL tetrabutyl titanate with 64.6mL absolute ethanol and stir for 1 hour to obtain A solution, then mix 3mL of 0.6mol / L praseodymium nitrate solution, 19mL acetic acid and 32.3mL absolute ethanol and stir for 1 hour A solution of B was obtained. The solution B was slowly added dropwise to the solution A, the pH value of the solution was adjusted to 1 by adding nitric acid, and the sol was obtained after stirring for 2 hours. After aging for 12h, dry at 100°C for 24h, and roast at 500°C for 4h to obtain 2#Pr 6 o 11 -TiO 2 Carrier: In the oxalic acid solution in which 0.579g of ammonium metavanadate was dissolved, 1.1g of ammonium molybdate and the above-mentioned 2# carrier were added, after ultrasonication in a water bath at 60°C for 2h, drying at 80°C for 12h, and calcination at 450°C for 3h, the catalyst 2# was obtained , its Langmuir specific surface is 64m 2 / g.

Embodiment 3

[0026] Mix 55mL of tetrabutyl titanate with 63mL of absolute ethanol and stir for 1 hour to obtain A solution, then mix 6 mL of 0.6 mol / L praseodymium nitrate solution, 18.6 mL of acetic acid and 31.6 mL of absolute ethanol and stir for 1 hour to obtain B solution. The solution B was slowly added dropwise to the solution A, the pH value of the solution was adjusted to 1 by adding nitric acid, and the sol was obtained after stirring for 1.5 h. After aging for 12h, dry at 100°C for 24h, and roast at 500°C for 4h to obtain 3#Pr 6 o 11 -TiO 2 Carrier: In the oxalic acid solution in which 0.579g of ammonium metavanadate was dissolved, 1.1g of ammonium molybdate and the above-mentioned 3# carrier were added, after ultrasonication in a water bath at 60°C for 2h, drying at 80°C for 12h, and roasting at 450°C for 3h, the 3# catalyst was obtained , its Langmuir specific surface is 119m 2 / g.

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Abstract

The invention provides a low-temperature SCR (Selective Catalytic Reduction) catalyst taking Pr-doped TiO2 as a carrier and a preparation method, and belongs to the technical field of an oxide low-temperature SCR catalyst. The low-temperature SCR catalyst takes the Pr-doped TiO2 as the carrier and is loaded with V2O5 and MoO3 as active components of the catalyst; the mass of Pr6O11 in Pr6O11-TiO2 is not greater than 15% of the mass of the TiO2; and the loading amounts of the V2O5 and the MoO3 are 0-10wt% and 0-10wt%. A preparation process of the catalyst comprises the following steps: after preparing the Pr-doped TiO2 carrier by using a sol-gel method, loading the V2O5 and the MoO3 by using an impregnation method; and drying, roasting and grinding to obtain the product. The preparation process is simple and reaction conditions are moderate; the specific surface area of the catalyst is enlarged and the dispersion of grains is uniform; and the activity of the Pr-doped catalyst is obviously higher than that of an un-doped catalyst.

Description

technical field [0001] The invention relates to a kind of TiO doped with Pr 2 The invention discloses a method for preparing an SCR catalyst as a carrier, belonging to the technical field of oxide low-temperature SCR catalysts. Background technique [0002] With the development of social productivity, energy consumption is increasing day by day, air pollution is becoming more and more serious, nitrogen oxides (including N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 , N 2 o 5 etc., referred to as NOx) is one of the main pollution sources. NOx emission sources are mainly divided into mobile sources (motor vehicle exhaust) and stationary sources (thermal power plants, industrial combustion). The China Academy of Environmental Planning predicts that my country will become the world's largest nitrogen oxide emitter around 2020. Controlling the emission of nitrogen oxides is an important issue in current environmental governance. In 2010, my country clearly put forward plans and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01D53/90B01D53/56
Inventor 何洪晁晶迪房玉娇宋丽云
Owner BEIJING UNIV OF TECH
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