A supported manganese-based medium and low temperature denitrification catalyst, its preparation method and its application

A supported manganese-based, low-temperature denitrification 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 poor low-temperature activity of manganese-based denitrification catalysts, and achieve enhanced medium-low temperature Effects of catalytic activity and excellent low-temperature denitrification performance

Active Publication Date: 2022-02-11
SICHUAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a supported manganese-based medium-low temperature denitrification catalyst, preparation method and application thereof, which has excellent low-temperature catalytic denitrification and medium-low temperature reaction performance, and a wide operating temperature window; it can be applied to flue gas denitrification, To solve the problem of poor activity of manganese-based denitration catalysts at medium and low temperatures in the existing flue gas SCR denitration catalyst technology

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  • A supported manganese-based medium and low temperature denitrification catalyst, its preparation method and its application
  • A supported manganese-based medium and low temperature denitrification catalyst, its preparation method and its application
  • A supported manganese-based medium and low temperature denitrification catalyst, its preparation method and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The sample of supported manganese-based low-temperature denitration catalyst in this example was prepared by the following steps:

[0053] (1) Impregnation: Weigh 1.01g of manganese acetate and dissolve it in 8mL of deionized water, add 2.4g of carrier titanium dioxide, stir at room temperature for 6h, mix evenly, transfer to an oven at 80°C for 12h, grind to powder, and obtain bivalent The initial sample of manganese salt;

[0054] (2) Grinding and mixing and solid-phase interface reaction: add potassium permanganate solid to the initial sample of divalent manganese salt, and carry out sufficient grinding and mixing and solid-phase interface reaction for 20 minutes to obtain a manganese-containing precursor; wherein, potassium permanganate The molar ratio of Mn to the divalent manganese salt is 1:5, and the total mass of the divalent manganese salt and potassium permanganate is 27% of the mass of the carrier.

[0055] (3) Aging: Aging the manganese-containing precurso...

Embodiment 2

[0060] The sample of supported manganese-based low-temperature denitration catalyst in this embodiment was prepared by the following steps:

[0061] (1) Impregnation: Weigh 0.51g of manganese acetate and dissolve it in 8mL of deionized water, add 2.7g of carrier titanium dioxide, stir at room temperature for 6h, mix evenly, transfer to an oven at 80°C for 12h, grind to powder, and obtain divalent The initial sample of manganese salt;

[0062] (2) Grinding and mixing and solid-phase interface reaction: add potassium permanganate solid to the initial sample of divalent manganese salt, and carry out sufficient grinding and mixing and solid-phase interface reaction for 20 minutes to obtain a manganese-containing precursor; wherein, potassium permanganate The molar ratio of Mn to the divalent manganese salt is 2:3, and the total mass of the divalent manganese salt and potassium permanganate is 60% of the mass of the carrier.

[0063] (3) Aging: Aging the manganese-containing precu...

Embodiment 3

[0069] The sample of supported manganese-based medium-low temperature denitration catalyst in this example was prepared by the following steps:

[0070] (1) Impregnation: Weigh 0.05g of manganese acetate and dissolve it in 8mL of deionized water, and add carrier γ-Al 2 o 3 2.97 g was stirred at room temperature for 6 hours to mix evenly, then transferred to an oven at 80°C to dry for 12 hours, and then ground to powder to obtain the initial sample of divalent manganese salt;

[0071] (2) Grinding and mixing and solid-phase interface reaction: add potassium permanganate solid to the initial sample of divalent manganese salt, and carry out sufficient grinding and mixing and solid-phase interface reaction for 20 minutes to obtain a manganese-containing precursor; wherein, potassium permanganate The molar ratio of Mn to the divalent manganese salt is 2:3, and the total mass of the divalent manganese salt and potassium permanganate is 2% of the mass of the carrier.

[0072] (3) ...

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Abstract

The invention discloses a supported manganese-based medium-low temperature denitrification catalyst, its preparation and application, and belongs to the technical field of environment-friendly catalytic materials. The catalyst is prepared by adding carrier titania or aluminum oxide to divalent manganese salt solution, stirring and mixing, drying, and then adding potassium permanganate through solid phase interface reaction. The denitration catalyst provided by the present invention is used for selective catalytic reduction denitration reaction, has significantly enhanced low-temperature (100-200°C) or medium-low temperature (200-300°C) catalytic activity, and has excellent low-temperature denitrification performance at high loading capacity , a typical sample at a space velocity of 30000ml / g h, the NO conversion rate in the mixed gas reaches 98.7% at 100 °C, and the NO conversion rate at 200 °C is 98.9%; it has excellent medium temperature denitrification performance at low loading capacity, typical sample At a space velocity of 60000ml / g·h and 200°C, the conversion rate of NO in the mixed gas reaches 99.0%, and the conversion rate of NO is still 99.6% when the temperature rises to 300°C. The denitration catalyst provided by the invention has potential application value.

Description

technical field [0001] The invention relates to the technical field of environment-friendly catalytic materials, in particular to a supported manganese-based medium-low temperature denitrification catalyst, a preparation method and an application thereof. Background technique [0002] In recent years, the state has paid more and more attention to environmental protection and environmental governance, and has achieved stricter control over the discharge of pollutants. Among them, NOx is a kind of air pollutant that produces great pollution. The main source is boiler exhaust gas, nitrification plant exhaust gas, etc. In particular, coal-fired power generation still occupies an absolute dominant position in my country, producing a large amount of exhaust gas containing NOx. Selective Catalytic Reduction (SCR), the most widely used denitrification method at present, uses a reducing agent to reduce NOx to N that is harmless to the atmosphere. 2 . Common reducing agents are hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J37/08B01D53/86B01D53/56
CPCB01J23/34B01J23/002B01J37/088B01D53/8628B01D2258/0283B01D2257/404B01D2258/02
Inventor 储伟康辉叶简
Owner SICHUAN UNIV
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