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Used to oxidize no to no 2 Catalysts and methods for their preparation and use

A catalyst and titanium dioxide technology, applied in the field of catalyst and its preparation, can solve the problems of limited application, high cost, poor environmental adaptability, etc., and achieve the effect of good application prospect and wide reaction activity temperature window.

Active Publication Date: 2017-02-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, platinum-based catalysts have been proved to have high activity for the catalytic oxidation of NO, but the cost is too high, the environmental adaptability is poor, and the oxidation rate of NO generally does not exceed 80%, which is a great limitation. its application in business

Method used

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  • Used to oxidize no to no <sub>2</sub> Catalysts and methods for their preparation and use
  • Used to oxidize no to no <sub>2</sub> Catalysts and methods for their preparation and use
  • Used to oxidize no to no <sub>2</sub> Catalysts and methods for their preparation and use

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Weigh 10g of mixed crystal titanium dioxide (average particle size 25nm, of which the anatase type accounts for about 75% by weight, and the rutile type accounts for about 25% by weight), dissolve it in 50ml of distilled water and heat it to 80°C to maintain a constant temperature. 4.45g manganese acetate (C 4 h 6 MnO 4 4H 2 O) added to the solution and evaporated to dryness with electromagnetic stirring. The obtained sample was placed in an oven at 110° C. for 12 hours, and then calcined at 300° C. for 6 hours in an air atmosphere. Finally, the obtained catalyst is crushed and sieved to obtain 40-60 mesh particles. The mass fraction of manganese element relative to the mixed crystal titanium dioxide in the obtained catalyst is 10%, which is marked as AR-10-300.

Embodiment 2

[0041]Weigh 10g of mixed crystal titanium dioxide (average particle size 25nm, of which the anatase type accounts for about 75% by weight, and the rutile type accounts for about 25% by weight), dissolve it in 50ml of distilled water and heat it to 80°C to maintain a constant temperature. 4.45g manganese acetate (C 4 h 6 MnO 4 4H 2 O) added to the solution and evaporated to dryness with electromagnetic stirring. The obtained sample was placed in an oven at 110° C. for 12 hours, and then calcined at 400° C. for 6 hours in an air atmosphere. Finally, the obtained catalyst is crushed and sieved to obtain 40-60 mesh particles. The mass fraction of manganese element relative to the mixed crystal titanium dioxide in the obtained catalyst is 10%, which is marked as AR-10-400.

Embodiment 3

[0043] Weigh 10g of mixed crystal titanium dioxide (average particle size 25nm, of which the anatase type accounts for about 75% by weight, and the rutile type accounts for about 25% by weight), dissolve it in 50ml of distilled water and heat it to 80°C to maintain a constant temperature. 4.45g manganese acetate (C 4 h 6 MnO 4 4H 2 O) added to the solution and evaporated to dryness with electromagnetic stirring. The obtained sample was placed in an oven at 110° C. for 12 hours, and then calcined at 500° C. for 6 hours in an air atmosphere. Finally, the obtained catalyst is crushed and sieved to obtain 40-60 mesh particles. The mass fraction of manganese element relative to the mixed crystal titanium dioxide in the obtained catalyst is 10%, which is marked as AR-10-500.

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Abstract

The invention provides a catalyst for oxidizing NO into NO2 as well as a preparation method and a using method thereof. The catalyst comprises a carrier and an active component, wherein the carrier is mixed-crystal titanium dioxide including anatase titanium dioxide and rutile titanium dioxide; the active component is oxide containing a manganese element. The catalyst provided by the invention is wide in reaction activity temperature window; ideal NO oxidation efficiency can be achieved within a wide temperature range. A test shows that high NO oxidation efficiency can be achieved by the catalyst; the NO oxygenation efficiency can be up to 90%.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for oxidizing NO into NO 2 Catalysts and methods for their preparation and use. Background technique [0002] Nitrogen oxides (NOx) from fossil fuel combustion x ) is one of the main air pollutants. NO x There are multiple hazards to the environment and human health, including acid rain, photochemical smog, ozone layer depletion, and the greenhouse effect. for NO x At present, the most widely used control method is the selective catalytic reduction technology (SCR) based on vanadium-tungsten-titanium catalysts. The technology targets NO x It has high removal efficiency and good operation stability, but there are still many problems, such as high reaction temperature, large floor space, ammonia as a reducing agent, and secondary pollution caused by ammonia leakage. Wait. [0003] as NO x The main source of emissions, NO from coal-fired boilers x 90-95% of NO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCY02C20/10
Inventor 禚玉群安忠义陈昌和佟会玲
Owner TSINGHUA UNIV