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Preparation and application of high-performance Fe, Ce, Mn and Ti four-component catalyst

A catalyst and four-component technology, applied in the direction of catalyst activation/preparation, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of poor low-temperature activity and weak poisoning ability, and achieve good mutual contact and low cost The effect of lowering and increasing the specific surface area

Inactive Publication Date: 2021-02-09
HEIHE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the disadvantages of the poor low-temperature activity of the existing Ce-Ti oxide catalyst for selective catalytic reduction of nitrogen oxides, and the manganese-based oxide catalyst is resistant to H 2 O and SO 2 Weak poisoning ability and other problems, provide a simple method of using n-butyl titanate as titanium source, and adding a small amount of Fe, Ce and Mn to prepare high-performance Fe, Ce, Mn, Ti four-component Fe m -Ce n -Mn 0.1-m-n o x -TiO 2 NH of complex metal oxides 3 -SCR catalyst

Method used

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  • Preparation and application of high-performance Fe, Ce, Mn and Ti four-component catalyst
  • Preparation and application of high-performance Fe, Ce, Mn and Ti four-component catalyst
  • Preparation and application of high-performance Fe, Ce, Mn and Ti four-component catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Substances such as n-butyl titanate, cerium nitrate, iron nitrate and manganese nitrate are all based on the product Fe m -Ce n -Mn 0.1-m-n o x -TiO 2 (0<m≤0.050, 0<n≤0.025) stoichiometric ratio weighing. m=0.01, 0.02, 0.03, 0.04 or 0.05; n=0.005, 0.015 or 0.025.

[0037] S1: Slowly drop n-butyl titanate into the mixture of citric acid, ethanol, glacial acetic acid and deionized water, mix well to form A solution; add cerium nitrate, iron nitrate and manganese nitrate to citric acid, ethanol, ice In the mixture of acetic acid and deionized water, mix evenly to form B solution;

[0038] S2: Mix solution A and solution B, stir at room temperature for 3 hours, take it out and place it in a blast oven at a constant temperature of 30°C to obtain a xerogel;

[0039] S3: drying the xerogel in an oven at 110°C to form a catalyst precursor;

[0040] S4: Grind the catalyst precursor into powder, press into tablets in a muffle furnace, heat up and sinter, cool to room tempe...

Embodiment 2

[0046] TiO 2 , FeO x -TiO 2 (FeO x / TiO 2 =1 / 10), MnO x -TiO 2 (MnO x / TiO 2 = 1 / 10) and Fe 0.01 -MnO x -TiO 2 ((FeO x +MnO x ) / TiO 2 =1 / 10) and other catalysts are similar to the experimental method of Example 1 or adopt existing commercially available materials to carry out tests such as the catalyst activity evaluation of Example 3 as reference substances.

Embodiment 3

[0048] in H 2 O (gas phase) volume concentration is 3% to 15%, SO 2 Concentration is 50ppm~200ppm, NO concentration is 500ppm~1200ppm, NH 3 The concentration is 500ppm~1200ppm, O 2 The volume concentration is 2% ~ 5%, N 2 Make balance gas, air speed is 30,000h -1 ~200,000h -1 And under the condition of 200℃~270℃, its anti-H 2 O and SO 2 sex.

[0049] Catalyst activity evaluation method:

[0050] NO conversion rate (%) = 100% × (NO 入口浓度(ppm) –NO 出口浓度(ppm) ) / NO 入口浓度(ppm) ;

[0051] NO here 入口浓度(ppm) Corresponding to the NO concentration entering the catalyst bed, NO 出口浓度(ppm) Corresponds to the concentration of NO after passing through the catalyst bed.

[0052] Detection method: Use a fixed bed microreactor-nitrogen oxide analyzer detection system. The nitrogen oxide analyzer is a Swiss ECO PHYSICS model, which can analyze NO online 2 , N 2 O, NO. Data were collected after each temperature point was stabilized for 1 h.

[0053]Specific steps: Put the measured...

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Abstract

The invention provides the simple preparation method of a Fem-Cen-Mn0. 1-m-nOx-TiO2 (0 < m < = 0.050, 0 < n < = 0.025) catalyst for selective catalytic reduction of nitrogen oxides, and the method hasthe advantages of cheap and easily available raw materials, no biotoxicity, simple and fast operation, low energy consumption and no special requirements on equipment, and has huge potential application prospects in the field of flue gas denitrification of coal-fired power plants. The synthesized catalyst combines the advantages of anatase TiO2, trace amounts of Fe, Ce and Mn are added, the advantages of TiO2 and CeO2 are both considered, the disadvantage of poor low-temperature activity of a Ce-Ti oxide catalyst is effectively made up, and the catalyst shows excellent catalytic performance in flue gas denitrification. The catalyst is suitable for being applied under the conditions of large airspeed range and medium and low temperature (180-390 DEG C), can show high activity, has excellent H2O and SO2 resistance and is long in service life.

Description

technical field [0001] The invention belongs to the field of catalyst preparation and application, and relates to the preparation and application of SCR (Selective Catalytic Reduction, SCR) denitrification catalyst, in particular to a high-performance Fe, Ce, Mn, Ti four-component NH 3 - SCR catalyst, preparation and use thereof. Background technique [0002] Nitrogen oxides are one of the main pollutants in the atmosphere, which can produce photochemical smog, heat island effect, acid rain, high ground ozone concentration and endanger human and animal health. my country has made it clear that NO x The emission of nitrogen oxides is one of the key pollutants to be controlled, and correspondingly higher requirements for nitrogen oxide control are put forward for large emitters such as the thermal power industry and the motor vehicle industry. NO x There are two main sources of emissions: stationary sources such as coal-fired power plants, cement plants, glass kilns, etc., ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J37/03B01J37/08B01D53/56B01D53/58B01D53/86
CPCB01D53/8628B01D53/8634B01D2257/404B01D2257/406B01D2258/0283B01J23/002B01J23/8892B01J37/036B01J37/082B01J2523/00B01J2523/3712B01J2523/47B01J2523/72B01J2523/842
Inventor 陈利强杨继明陈丽华朱明霞孙晶
Owner HEIHE UNIV
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