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Vanadium-doped iron-based low-temperature denitration catalyst as well as preparation method and application thereof

A low-temperature denitrification and catalyst technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reduced catalyst activity, reduced catalytic performance, and unsuitable for practical applications.

Active Publication Date: 2021-07-09
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although manganese-based catalysts have excellent catalytic performance in the field of low-temperature denitrification, SO 2 and H 2 O will chemically react with Mn and lead to a decrease in catalytic performance, so it is not suitable for practical applications
Iron-based catalysts will not interact with SO in low-temperature denitrification 2 and H 2 O reacts and is stable, but SO 2 and H 2 O will be with NH 3 (The reducing agent commonly used in low-temperature denitrification) The reaction will generate solid ammonium bisulfate to cover the surface of the catalyst and reduce the activity of the catalyst

Method used

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  • Vanadium-doped iron-based low-temperature denitration catalyst as well as preparation method and application thereof
  • Vanadium-doped iron-based low-temperature denitration catalyst as well as preparation method and application thereof
  • Vanadium-doped iron-based low-temperature denitration catalyst as well as preparation method and application thereof

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preparation example Construction

[0021] The invention provides a method for preparing a vanadium-doped iron-based low-temperature denitration catalyst, comprising the following steps:

[0022] Dissolving ferric salt, ferrous salt and pentavalent vanadium salt in water to obtain a mixed solution;

[0023] The mixed solution is mixed with the precipitant solution to undergo co-precipitation, and the obtained precipitate is dried and calcined in sequence to obtain a vanadium-doped iron-based low-temperature denitrification catalyst.

[0024] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0025] The present invention dissolves trivalent iron salt, divalent iron salt and pentavalent vanadium salt in water to obtain a mixed solution.

[0026] The present invention has no special requirements on the specific type of the ferric salt, as long as it can be dissolved in water. In the present invention, the ferric salt preferably...

Embodiment 1

[0055] (1) Take 9.0g (0.0333mol) FeCl 3 ·6H 2 O and 4.63g (0.0166mol) FeSO 4 ·7H 2 O powder was added into deionized water, and stirred to dissolve it to obtain an iron salt solution.

[0056] (2) Take 0.065g (0.0006mol) NH 4 VO 3 Dissolve in deionized water to obtain a vanadium salt solution.

[0057] (3) Slowly drop the vanadium salt solution into the iron salt solution under stirring to obtain a mixed solution (wherein the molar ratio of V:Fe is 0.01:1).

[0058] (4) Under stirring, add NH dropwise to the mixed solution in step (3) 3 ·H 2 O, adjust the pH to 9.0, wash the obtained precipitate with deionized water three times, dry at 90°C for 9h, and calcinate the obtained solid in an air atmosphere at 300°C for 2h to obtain a vanadium-doped iron-based low-temperature denitrification catalyst.

Embodiment 2

[0060] The difference with Example 1 is that the NH added in step (2) 4 VO 3 The mass is 0.132g (0.001mol), and the molar ratio of V:Fe in the mixed solution obtained in the corresponding step (3) is 0.02:1, and the rest are the same as in Example 1.

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Abstract

The invention provides a vanadium-doped iron-based low-temperature denitration catalyst as well as a preparation method and application thereof, and relates to the technical field of catalytic materials. The iron oxide and the vanadium oxide in the vanadium-doped iron-based low-temperature denitration catalyst cannot react with water and sulfur, and in the catalytic reduction reaction process of nitric oxide, generated ammonium hydrogen sulfate can be decomposed by the catalyst, so that catalyst poisoning cannot be caused; in addition, due to doping of the V element, the surface acidity of the catalyst can be improved, the oxidation-reduction capacity of the catalyst is improved, an electron synergistic effect also exists between the vanadium oxide and the iron oxide, and the activity of the catalyst is improved. The embodiment show that the performance of the catalyst still remains unchanged when the catalyst continuously operates for more than 12 hours in the presence of H2O and SO2, and the conversion rate of nitrogen oxides still reaches up to 100%, so that the catalyst has relatively high stability and catalytic activity.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a vanadium-doped iron-based low-temperature denitration catalyst and a preparation method and application thereof. Background technique [0002] Low-temperature denitrification catalysts are widely used to treat waste gas from glass, industrial boilers, waste incineration, hazardous waste and other industries. At present, in addition to nitrogen oxides, exhaust gas also inevitably contains some SO 2 and H 2 O. Although manganese-based catalysts have excellent catalytic performance in the field of low-temperature denitrification, SO 2 and H 2 O will chemically react with Mn and lead to a decrease in catalytic performance, so it is not suitable for practical applications. Iron-based catalysts will not interact with SO in low-temperature denitrification 2 and H 2 O reacts and is stable, but SO 2 and H 2 O will be with NH 3 (The reducing agent commonly used in l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J37/03B01J37/08B01D53/86B01D53/56
CPCB01J23/8472B01J37/03B01J37/082B01J23/002B01D53/8628B01D2257/404B01D2258/0283B01D2251/2062
Inventor 张杰邹模良代威力杨丽霞许勇
Owner NANCHANG HANGKONG UNIVERSITY
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