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Low-temperature sulfur-resistant and water-resistant denitration catalyst as well as preparation method and application thereof

A denitration catalyst, catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of limiting the application range of catalysts, poor water and sulfur resistance, etc. , enhance hydrophobicity, reduce the effect of sulfate formation

Active Publication Date: 2021-06-18
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing low-temperature denitrification catalysts often have poor water and sulfur resistance, which limits the application range of this type of catalyst

Method used

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  • Low-temperature sulfur-resistant and water-resistant denitration catalyst as well as preparation method and application thereof
  • Low-temperature sulfur-resistant and water-resistant denitration catalyst as well as preparation method and application thereof
  • Low-temperature sulfur-resistant and water-resistant denitration catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, the weight ratio of each component in the catalyst is: 0.5 parts of vanadium pentoxide, 3 parts of neodymium oxide, 3 parts of nickel oxide, 8 parts of manganese oxide, and 85.5 parts of titanium dioxide.

[0029] The preparation method of the above-mentioned SCR denitration catalyst with water resistance and sulfur resistance comprises the following steps:

[0030] 1) Add ammonium metavanadate and oxalic acid in equal molar ratio into deionized water, heat in a water bath at 60°C, and stir evenly until the solution is completely transparent;

[0031] 2) Add neodymium oxide, nickel oxide, titanium dioxide, and manganese oxide to the solution in step 1), and mix uniformly to obtain a mixed solution A with a solid content of 30 wt.%. The pH of the solution is controlled between 3 and 5. The mixed solution A was coated on the porous cordierite carrier by impregnation method, and the coating amount of the catalyst coating was 120 g / L.

[0032] 3) Dry th...

Embodiment 2

[0034] In this embodiment, the weight ratio of each component in the catalyst is: 3 parts of vanadium pentoxide, 3 parts of neodymium oxide, 3 parts of nickel oxide, 8 parts of manganese oxide, and 83 parts of titanium dioxide.

[0035] The preparation method of the above-mentioned SCR denitration catalyst with water resistance and sulfur resistance comprises the following steps:

[0036] 1) Add ammonium metavanadate and oxalic acid in equal molar ratio into deionized water, heat in a water bath at 60°C, and stir evenly until the solution is completely transparent;

[0037] 2) Add neodymium oxide, nickel oxide, titanium dioxide, and manganese oxide to the solution in step 1), and mix uniformly to obtain a mixed solution A with a solid content of 30 wt.%. The pH of the solution is controlled between 3 and 5. The mixed solution A was coated on the porous cordierite carrier by impregnation method, and the coating amount of the catalyst coating was 120 g / L.

[0038] 3) Dry the po...

Embodiment 3

[0040] In this embodiment, the weight ratio of each component in the catalyst is: 6 parts of vanadium pentoxide, 3 parts of neodymium oxide, 3 parts of nickel oxide, 8 parts of manganese oxide, and 80 parts of titanium dioxide.

[0041] The preparation method of the above-mentioned SCR denitration catalyst with water resistance and sulfur resistance comprises the following steps:

[0042] 1) Add ammonium metavanadate and oxalic acid in equal molar ratio into deionized water, heat in a water bath at 60°C, and stir evenly until the solution is completely transparent;

[0043] 2) Add neodymium oxide, nickel oxide, titanium dioxide, and manganese oxide to the solution in step 1), and mix uniformly to obtain a mixed solution A with a solid content of 30 wt.%. The pH of the solution is controlled between 3 and 5. The mixed solution A was coated on the porous cordierite carrier by impregnation method, and the coating amount of the catalyst coating was 120 g / L.

[0044] 3) Dry the poro...

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Abstract

The invention discloses a low-temperature sulfur-resistant and water-resistant denitration catalyst as well as a preparation method and application thereof, which belongs to the technical field of catalysts. The catalyst comprises a porous ceramic carrier and a catalyst coating coated on the carrier, the size of the porous ceramic carrier is (25-150) mm*(25-150) mm*(25-100) mm, and the number of pores is 25-300; the active components of the catalyst coating comprise vanadium pentoxide, neodymium oxide, nickel oxide, manganese oxide and titanium dioxide, V2O5 accounts for 0.5-6 wt% of the catalyst, Nd2O3 accounts for 1-6 wt% of the catalyst, NiO accounts for 0.8-6 wt% of the catalyst, MnO accounts for 5-10 wt% of the catalyst, and TiO2 accounts for 82-97.7 wt% of the catalyst. The denitration catalyst provided by the invention has higher low-temperature activity, widens an active temperature window, also has the advantages of sulfur resistance, water resistance and environmental friendliness, and can be widely applied to tail gas denitration treatment of thermal power plants and cement plants.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to SCR denitrification catalysts with water and sulfur resistance, especially V 2 o 5 -Nd 2 o 3 -NiO-MnO / TiO 2 Low-temperature sulfur-resistant and water-resistant denitrification catalyst and its preparation method and application. Background technique [0002] NOx is not only the main contributor to acid rain, but also the prerequisite for the formation of near-surface atmospheric ozone pollution, photochemical smog, secondary fine particle pollution, and surface eutrophication. Prominent atmospheric environmental hotspot issues. [0003] At present, the SCR method is considered to be the best denitrification technology. It uses ammonia or other reducing agents to selectively reduce NOx to N under the action of a specific catalyst. 2 Methods. Among them, NH 3 The SCR technology as a reducing agent has been widely used because of its high efficiency and no secondary polluti...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01J23/002B01J23/8892B01D53/8628B01J2523/00B01J2523/3725B01J2523/47B01J2523/55B01J2523/72B01J2523/847
Inventor 董林郝士杰孙敬方汤常金蔡宁生赵勇刚仝庆
Owner NANJING UNIV
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