Preparation method and application of nitrogen-doped titanium dioxide denitration catalyst

A denitration catalyst, titanium dioxide technology, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., to achieve the effects of strong controllability, low preparation temperature, and increased Fermi level

Pending Publication Date: 2022-03-29
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of how to improve the existing denitration catalyst without using active components, and to provide a preparation method and application of a nitrogen-doped titanium dioxide denitration catalyst, which is filled with N-TiO 2 in NH 3 -A blank in the field of SCR denitrification, and also provides new ideas for the synthesis of denitrification catalysts, opening up a new era of synthesis of denitrification catalysts without active components

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  • Preparation method and application of nitrogen-doped titanium dioxide denitration catalyst
  • Preparation method and application of nitrogen-doped titanium dioxide denitration catalyst
  • Preparation method and application of nitrogen-doped titanium dioxide denitration catalyst

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preparation example Construction

[0024] The first aspect of the present invention provides a method for preparing a nitrogen-doped titanium dioxide denitration catalyst, wherein the method includes: (1) performing surface hydrogenation reduction on a titanium source to obtain black TiO 2 powder; (2) the black TiO 2 The powder is doped with nitrogen to obtain N-TiO 2 catalyst.

[0025] In the present invention, step (1) is used to construct defects by surface hydrogenation of the titanium source, resulting in a large number of oxygen vacancies and Ti 3+ , so as to form an oxygen cycle with the reaction gas; step (2) is used to stabilize oxygen vacancies through nitrogen doping while increasing the Fermi level, making it easier for electrons to escape, N-TiO 2 Provides redox performance while enhancing N-TiO 2 denitrification efficiency.

[0026] In some embodiments of the present invention, the surface hydrogenation can realize that the hydrogenated titanium source has a certain number of oxygen vacancies ...

Embodiment 1

[0055] This example is used to illustrate the preparation method of nitrogen-doped titania catalyst

[0056] (1) First, carry out hydrogenation reduction on the surface of titanium dioxide, under normal pressure, 99.99% H 2 Under the atmosphere, the hydrogen flow rate is 200mL / min, hydrogenation is carried out in a tube furnace at 450°C, kept for 11h, and then lowered to room temperature to prepare black TiO 2 powder.

[0057] (2) Then, the black TiO 2 For nitrogen doping, under normal pressure, NH 3 / N 2 Under an atmosphere with a volume ratio of 1:99, purge in a fixed bed at 300 °C for 1 h, and then cool down to room temperature to obtain N-TiO 2 catalyst.

[0058] figure 1 N-TiO of the present invention 2 The XPS spectrum of the catalyst. From figure 1 It can be seen that in the high-resolution spectrum corresponding to N1s, the binding energy at 399.59eV corresponds to the gap N (Ti-O-N), which proves that the obtained product is nitrogen-doped titanium dioxide. ...

Embodiment 2

[0062] This example is used to illustrate the preparation method of nitrogen-doped titania catalyst

[0063] (1) First, carry out hydrogenation reduction on the surface of titanium dioxide, under normal pressure, 99.99% H 2 Under the atmosphere, the hydrogen flow rate is 100mL / min, hydrogenation is carried out in a tube furnace at 500°C, kept for 12h, and then lowered to room temperature to prepare black TiO 2 powder.

[0064] (2) Then, the black TiO 2 For nitrogen doping, under normal pressure, NH 3 / N 2 Under an atmosphere with a volume ratio of 1:99, purge in a fixed bed at 300°C for 1.5h, and then cool down to room temperature to obtain N-TiO 2 catalyst.

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Abstract

The invention relates to the technical field of flue gas denitration catalysts, and discloses a preparation method and application of a nitrogen-doped titanium dioxide denitration catalyst. The preparation method of the nitrogen-doped titanium dioxide denitration catalyst comprises the following steps: (1) carrying out surface hydrogenation reduction on a titanium source to obtain black TiO2 powder; and (2) carrying out nitrogen doping on the black TiO2 powder to obtain the N-TiO2 catalyst. The crystal form of the N-TiO2 catalyst is an anatase type, and the N-TiO2 catalyst has oxygen vacancies and Ti < 3 + >; on the basis of the total weight of the N-TiO2 catalyst, the content of the nitrogen element is 0.4-0.5 wt%, and N atoms enter TiO2 crystal lattices in an interstitial doping (Ti-O-N) manner. The denitration efficiency of the nitrogen-doped TiO2 denitration catalyst at the temperature of 300-400 DEG C can reach 90% or above, the N2 selectivity can reach 92% or above, and the nitrogen-doped TiO2 denitration catalyst can be applied to NH3-SCR denitration.

Description

technical field [0001] The invention relates to the technical field of flue gas denitration catalysts, in particular to a preparation method and application of a nitrogen-doped titanium dioxide denitration catalyst. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants, an important factor for the formation of acid rain, one of the important precursors for the formation of ozone and photochemical smog, and the formation of regional ultrafine particle (PM2.5) pollution and haze important reason. [0003] Coal-fired power plants are one of the main sources of NOx emissions. At present, the NOx emission of power plants in my country adopts the most stringent emission limit in the world, and the best technical way to meet the standard is selective catalytic reduction of ammonia (NH 3 -SCR) NOx. Conventional commercial V 2 o 5 / WO 3 -TiO 2 Catalyst, its optimal activity temperature range is 350-450°C. where V 2 o 5 Main active ingredient...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/56
CPCB01J27/24B01D53/8628B01D2251/2062B01D2258/0283
Inventor 李歌王宝冬马子然马静王红妍陈静允
Owner CHNA ENERGY INVESTMENT CORP LTD
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