Modified denitration catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of impact and unfavorable catalyst life, achieve high N2 selectivity, and the preparation process is non-toxic and non-toxic Harmful, strong anti-alkali metal effect

Pending Publication Date: 2022-05-20
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this layout method effectively utilizes the heat energy of the flue gas and saves costs, it also has an adverse effect on the life of the catalyst.

Method used

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  • Modified denitration catalyst and preparation method thereof
  • Modified denitration catalyst and preparation method thereof
  • Modified denitration catalyst and preparation method thereof

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preparation example Construction

[0046] The present application also provides a method for preparing a modified denitration catalyst. The modified denitration catalyst is the above-mentioned modified denitration catalyst. Specifically, the preparation method may include the following steps:

[0047] S1: Weigh the modifying element precursor salt according to the preset ratio and dissolve it to obtain solution A;

[0048] In the embodiment of the present application, the precursor salts include but are not limited to ferric nitrate, ferric sulfate, ferric acetate, ferric chloride, cerium nitrate, cerium sulfate, cerium acetate, cerium chloride, ammonium sulfate, ammonium bisulfate and sulfuric acid one or more of.

[0049] S2: Mix the vanadium-tungsten-titanium catalyst with the solution A, impregnate at room temperature to obtain the mixed solution B.

[0050] In some embodiments, the denitration catalyst includes one or more of powdery, granular, honeycomb, corrugated and flat vanadium-tungsten-titanium cat...

Embodiment 1

[0058] Preparation method of commercial denitration catalyst (3SFeCeVWTi) modified with iron, cerium and sulfate radical:

[0059] Select a commercially available honeycomb vanadium-tungsten-titanium catalyst, crush and grind it to powder, and analyze the mass content of each component of the vanadium-tungsten-titanium catalyst by X-ray fluorescence spectroscopy, wherein, V 2 o 5 1.144%, WO 3 3.458%, TiO 2 is 90.102%.

[0060] S1: The molar ratio of Fe to V is 0.05:1, the molar ratio of Ce to V is 1.5:1, and the molar ratio of S to V is 4.5:1. Take by weighing 0.0152 gram of iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O), 0.4916 grams of cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) and 0.4488 grams of ammonium sulfate ((NH 4 ) 2 SO 4 ) is a precursor salt, which is successively added to 8 milliliters of deionized water, ultrasonically treated and stirred until fully dissolved to obtain solution A;

[0061] S2: Add 6 grams of powdered vanadium-tungsten-titanium ...

Embodiment 2

[0067] Preparation method of commercial denitration catalyst (SFeCeVWTi) modified with iron, cerium and sulfate radical:

[0068] Select a commercially available honeycomb vanadium-tungsten-titanium catalyst, crush and grind it to powder, and analyze the mass content of each component of the vanadium-tungsten-titanium catalyst by X-ray fluorescence spectroscopy, wherein, V 2 o 5 1.144%, WO 3 3.458%, TiO 2 is 90.102%.

[0069] S1: The molar ratio of Fe to V is 0.01:1, the molar ratio of Ce to V is 0.1:1, and the molar ratio of S to V is 0.1:1. Take by weighing 0.0031 gram of iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O), 0.0328 grams of cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) and 0.0100 grams of ammonium sulfate ((NH 4 ) 2 SO 4 ) is a precursor salt, which is successively added to 8 milliliters of deionized water, ultrasonically treated and stirred until fully dissolved to obtain solution A;

[0070] S2: Add 6 grams of powdered vanadium-tungsten-titanium c...

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Abstract

The invention discloses a modified denitration catalyst, which takes a denitration catalyst as a carrier and adopts at least one of iron, cerium and sulfate radical as a modification component to improve the components and surface properties of the denitration catalyst, and adopts an impregnation method to improve the components and surface properties of the catalyst on the premise of ensuring that the macroscopic form of the existing denitration catalyst is not changed. The preparation process is mild, non-toxic and harmless. According to the improved catalyst, the denitration activity of the catalyst is improved, the reaction temperature window is widened, the catalyst has high N2 selectivity, the modified commercial denitration catalyst has higher alkali metal, alkaline earth metal and heavy metal poisoning resistance, and the service life of the catalyst is effectively prolonged.

Description

technical field [0001] The present application relates to the technical field of preparation of flue gas denitration catalysts, in particular to a modified denitration catalyst and a preparation method thereof. Background technique [0002] Selective catalytic reduction of ammonia (NH 3 -SCR) technology is the most effective stationary source nitrogen oxide (NO x ) emission reduction technology. Vanadium-tungsten-titanium catalyst is currently the most widely used and mature NH catalyst in coal-fired power plants. 3 -SCR denitrification catalyst. The denitration catalyst in industrial application is a monolithic catalyst with a fixed shape, which is mainly divided into: honeycomb type, corrugated plate type and flat plate type. Vanadium-tungsten-titanium denitration catalyst has good denitration activity and high N 2 Selectivity, and has high hydrothermal stability and sulfur resistance. In order to achieve this temperature range, the denitration device is arranged bef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/888B01J27/053B01J37/02B01D53/86B01D53/56
CPCB01J23/30B01J23/888B01J23/002B01J27/053B01J37/0201B01D53/8628B01J2523/00B01D2258/0283B01D2251/2062B01J2523/3712B01J2523/47B01J2523/55B01J2523/69B01J2523/842
Inventor 王金秀易显芳陈进生
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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