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Catalyst, preparation method thereof and method for removing nitrogen oxide

A catalyst and oxide stone technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of low catalytic activity and difficult application, and achieve the effect of improving specific surface area, increasing contact area, and promoting SCR reaction.

Inactive Publication Date: 2017-08-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the working temperature of the catalysts used in the existing selective catalytic reduction technology is relatively high, and most of them are above 300°C, and the catalytic activity is low, so its application is relatively difficult

Method used

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  • Catalyst, preparation method thereof and method for removing nitrogen oxide
  • Catalyst, preparation method thereof and method for removing nitrogen oxide
  • Catalyst, preparation method thereof and method for removing nitrogen oxide

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preparation example Construction

[0029] The preparation method of the catalyst provided in the embodiment of the present invention comprises:

[0030] In step S101, a composite material containing composite titanium dioxide and graphene oxide is prepared by a sol-gel method.

[0031] In the embodiment of the present invention, the method for preparing the composite material by the sol-gel method is as follows:

[0032] Add tetrabutyl titanate and absolute ethanol into a dry beaker, and keep stirring and mixing at room temperature (eg, 20-30° C.). The volume ratio of tetrabutyl titanate to absolute ethanol may be 20-30:40, or 22:40, or 23:40, or 25:40, or 26:40, or 28:40. Preferably, the volume ratio of tetrabutyl titanate to absolute ethanol is 25.5:40.

[0033] Further, in the stirring and mixing process, the stirring process is carried out before the action of ultrasonic waves. For example, after stirring for 30 minutes, ultrasonic treatment is performed. The treatment time of ultrasonic waves is prefer...

Embodiment 1

[0053] A catalyst containing 0.2 wt % of graphene oxide and 1 wt % of transition metal (MnOx).

[0054] The preparation method of the catalyst is as follows: 25 mL of tetrabutyl titanate and 40 mL of absolute ethanol are stirred and mixed, and then 1 mL of hydrochloric acid and 4 mL of glacial acetic acid are added to continue stirring for 30 minutes to obtain A solution. By oxidizing graphite into graphite oxide, and then ultrasonically treating the graphite oxide aqueous solution to obtain a graphene oxide concentration aqueous solution, taking 25 mL of it and mixing it with 15 mL of anhydrous ethanol, and stirring for 30 minutes to obtain B solution. The B solution was added dropwise to 60 mL of the A solution, and the gel sample was obtained by ultrasonication and stirring. The gel samples were aged in air for 48 hours, dried at 120°C and ground, then calcined at 450°C in nitrogen atmosphere for 6 hours, cooled to room temperature and ground to obtain a composite material....

Embodiment 2

[0056] A catalyst containing 1.5 wt % of graphene oxide and 10 wt % of transition metal (MnOx).

[0057] The preparation method of the catalyst is as follows: 25 mL of tetrabutyl titanate and 40 mL of absolute ethanol are stirred and mixed, and then 4 mL of glacial acetic acid and 1 mL of hydrochloric acid are added to continue stirring for 30 minutes to obtain A solution. An aqueous solution with a graphene oxide concentration of 2 mg / mL was prepared, 22 mL was mixed with 15 mL of anhydrous ethanol, and stirred for 30 minutes to obtain solution B. The B solution was added dropwise to 60 mL of the A solution, and the gel sample was obtained by ultrasonication and stirring. The gel samples were aged in air for 48 hours, dried at 120°C and ground, then calcined at 450°C in nitrogen atmosphere for 6 hours, cooled to room temperature and ground to obtain a composite material. The dipping solution was obtained by mixing manganese acetate and water, and the dipping solution was hea...

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Abstract

The invention relates to a catalyst, a preparation method thereof and a method for removing nitrogen oxide and belongs to the field of catalysts. The catalyst comprises a modified material obtained by using transition metal to dope and modify a composite material, wherein the composite material comprises titanium dioxide and graphene oxide which are composited, and the transition metal comprises one or more of Mn, Fe, V, Cu, Cr and Co. The catalyst is cheap, capable of greatly lowering the activity temperature of SCR reaction and suitable for industrial application.

Description

technical field [0001] The present invention relates to the field of catalysts, in particular, to a catalyst and a preparation method thereof, and a method for removing nitrogen oxides. Background technique [0002] Nitrogen oxide is a general term for various compounds of nitrogen and oxygen, which exist in various forms, such as nitrous oxide (N 2 O), Nitric Oxide (NO), Nitrogen Dioxide (NO) 2 ), nitrous oxide (N 2 O 3 ), nitrous oxide (N 2 O 4 ) and nitrous oxide (N 2 O 5 ), etc., among which NO accounts for more than 90%. The emission of NOx will bring serious harm to human production, activities and the natural environment, including toxic effects on the human body, the formation of acid rain or acid fog, the damage to plants, the formation of photochemical smog with hydrocarbons, and the destruction of the ozone layer. The outline of the national "13th Five-Year Plan" has clarified the binding targets for emission reduction of major pollutants. In order to comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01J23/34B01D53/8628B01D2258/0283
Inventor 楚英豪陈芊尹华强罗德明岑望来郭家秀
Owner SICHUAN UNIV
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