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Vanadium-titanium-iron concentrate catalyst for NO catalytic oxidation and preparation method thereof

A vanadium-titanium iron concentrate, catalytic oxidation technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of high preparation cost of precious metal catalyst and limited industrial Application and popularization, difficulty in reactor design, etc., to achieve good NO catalytic conversion efficiency, easy control of the process, and simple preparation methods

Active Publication Date: 2017-03-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation cost of noble metal catalysts is obviously high, which limits its industrial application and promotion.
Invention patent CN1736558A discloses a catalyst for catalytic oxidation of NOx under microwave-assisted conditions. The catalyst uses Al 2 o 3 as carrier, MnO 2 As an active component, the catalytic oxidation efficiency of NO is high, but the maintenance cost is high and the reactor design is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The catalyst is vanadium ilmenite concentrate (containing Fe 50wt%, TiO 2 11.5wt%, V 2 O 5 0.5wt%, Al 2 O 3 2.1wt%, Mn0.2wt%) as carrier, active component manganese oxide (with MnO 2 The quality score is 5.5%.

[0020] Add vanadium ilmenite concentrate into deionized water, stir evenly, let stand for precipitation, remove the supernatant, and dry it in an oven to constant weight, select vanadium ilmenite concentrate powder with a particle size of 100-200 mesh, which is the catalyst carrier ; Dissolve manganese nitrate in water to prepare 100 mL of immersion solution with manganese nitrate mass fraction of 1.5%, add 12.5 g of vanadium ilmenite concentrate at a liquid-solid ratio of 8:1, and place it in a water bath at 75 °C for 5 hours. Transfer to a constant temperature oven, dry at 75°C for 4 hours, and then dry at 103°C to constant weight; roast the dried product in a muffle furnace at 530°C for 5 hours, cool and shape into 3-5mm particles to obtain vanadium-t...

Embodiment 2

[0023] The catalyst is vanadium ilmenite concentrate (containing Fe 50wt%, TiO 2 11.5wt%, V 2 O 5 0.5wt%, Al 2 O 3 2.1wt%, Mn0.2wt%) as carrier, active component manganese oxide (with MnO 2 meter) quality score is 11.5%.

[0024] Add vanadium ilmenite concentrate into deionized water, stir evenly, let stand for precipitation, remove the supernatant, and dry it in an oven to constant weight, select vanadium ilmenite concentrate powder with a particle size of 100-200 mesh, which is the catalyst carrier ; Dissolve manganese nitrate in water to prepare 100 mL of immersion solution with manganese nitrate mass fraction of 3.0%, add 11 g of vanadium ilmenite concentrate at a liquid-solid ratio of 9:1, and place it in a water bath at 80 °C for stirring for 6 hours. Transfer to a constant temperature oven, dry at 75 °C for 5 hours, and then dry at 103 °C to constant weight; roast the dried product in a muffle furnace at 400 °C for 6 hours, and then form into 3-5mm particles aft...

Embodiment 3

[0027] The catalyst is vanadium ilmenite concentrate (containing Fe 55wt%, TiO 2 15.0wt%, V 2 O 5 0.4wt%, Al 2 O 3 1.6wt%, Mn0.4wt%) as carrier, active component manganese oxide (with MnO 2 Count) quality fraction is 13.0%.

[0028] Add vanadium ilmenite concentrate into deionized water, stir evenly, let stand for precipitation, remove the supernatant, and dry it in an oven to constant weight, select vanadium ilmenite concentrate powder with a particle size of 100-200 mesh, which is the catalyst carrier ; Dissolve manganese acetate in water to prepare 100 mL of immersion solution with a mass fraction of manganese acetate of 3.0%, add 10 g of vanadium ilmenite concentrate at a liquid-solid ratio of 10:1, and place it in a water bath at 80 °C for 6 hours of stirring and reaction. Transfer to a constant temperature oven, dry at 75 °C for 6 hours, and then dry at 103 °C to constant weight; roast the dried product in a muffle furnace at 300 °C for 5 hours, and then form int...

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Abstract

The invention discloses a vanadium-titanium-iron concentrate catalyst for NO catalytic oxidation and a preparation method thereof and belongs to the technical field of pollutant catalytic conversion in air pollution control engineering. Nitrogen oxides in high-temperature flue gas mainly include NO, oxidation of NO into NO2 by a catalyst is the precondition for an existing wet desulfurization system to gain good nitrogen oxide purification effect. The NO catalytic oxidation composite catalyst is prepared from vanadium-titanium-iron concentrate as a support and manganese oxides as active ingredients by means of impregnation. The materials for the catalyst of the invention are low in price and easy to obtain, the preparation method is simple, a catalytic conversion temperature window is wide, the highest conversion ratio of NO to NO2 is up to 81.7%, nitrogen oxides can be purified under cooperation of wet desulfurization process, and the catalyst has a promising industrial application prospect.

Description

technical field [0001] The invention discloses a vanadium ilmenite concentrate catalyst for catalytic oxidation of NO and a preparation method thereof, and belongs to the technical field of catalytic conversion of pollutants in air pollution control engineering. Background technique [0002] Nitrogen oxides (NO x ) are typical air pollutants, and there are many types, including NO, NO 2 , N 2 O 3 , N 2 O 5 Wait. With the increasing demand for fossil fuels in industrial development, the emission of nitrogen oxides is increasing. In 2014, my country's nitrogen oxide emissions reached 20.78 million tons, and it is expected to reach 35.4 million tons in 2030. Nitrogen oxides are extremely harmful to human health and the ecological environment. Strengthening the prevention and control of nitrogen oxides pollution is an important issue to be solved urgently in air pollution control projects. [0003] The nitrogen oxides in industrial flue gas are mainly NO, NO 2 exists in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01D53/8628B01J23/8892B01D2257/404B01D2255/20707B01D2255/20738B01D2255/2073B01D2255/20723B01D2255/2092
Inventor 刘树根王洁谢容生张秋林宁平宋忠贤
Owner KUNMING UNIV OF SCI & TECH
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