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

An SCR catalyst and catalyst technology are applied in the field of SCR catalyst preparation to achieve the effects of good denitration efficiency, good denitration efficiency and easy control of preparation conditions

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

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Problems solved by technology

So far, there are no literature and patent reports, this V 2 o 5 -MoO 3 / La 2 o 3 -TiO 2 Catalyst preparation method

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 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

[0025] Mix 55mL tetrabutyl titanate with 63mL absolute ethanol and stir for 1h to obtain A solution, then mix 18.4mL of 0.2mol / L lanthanum nitrate solution, 18.6mL acetic acid and 31.6mL absolute ethanol and stir for 1h 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#La 2 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 110m 2 / g.

Embodiment 3

[0027] Mix 52.7mL tetrabutyl titanate with 60mL absolute ethanol and stir for 1h to obtain A solution, then mix 36.8mL of 0.2mol / L lanthanum nitrate solution, 17.8mL acetic acid and 30mL absolute ethanol and stir for 1h 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 3#La 2 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 111m 2 / g.

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Abstract

The invention provides a low-temperature SCR (Selective Catalytic Reduction) denitration catalyst taking La-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 denitration catalyst takes the La-doped TiO2 as the carrier and is loaded with V2O5 and MoO3 as active components of the catalyst; the mass of La2O3 in the catalyst 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 La-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 La-doped catalyst is obviously higher than that of an un-doped catalyst.

Description

technical field [0001] The invention relates to a TiO doped with La 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 modern industry and the improvement of people's living standards, the environment on which human beings depend is facing enormous challenges, and the pollution and destruction of the environment are the most important problems. Now one of the most important sources of air pollution: 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), and its 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. In 2010, my country clearl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01J23/22B01D53/86B01D53/56
Inventor 何洪晁晶迪宋丽云房玉娇
Owner BEIJING UNIV OF TECH
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