Ferro-tungsten composite oxide denitrification catalyst with flower petal structure and preparation method and application of ferro-tungsten composite oxide denitrification catalyst with flower petal structure

A composite oxide and flower-shaped technology, applied in the field of catalytic denitrification, can solve the problems of poor water resistance, sulfur resistance and thermal stability, limit large-scale industrial application, high denitrification activity temperature, etc., achieve low cost, good resistance to SO2 and H2O poisoning ability, the effect of high N2 selectivity

Active Publication Date: 2014-06-25
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fe-ZSM-5 (K. Krishna, et al., Catal. Today, 2006, 114: 23), Fe2O3 (X. L. Mou, et al. , Angew. Chem. Int. Ed. 2012, 51: 1) and Fe-Ti composite oxide (F. D. Liu, et al., Chem. Commun., 2008: 2043) catalysts showed good catalytic performanc

Method used

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  • Ferro-tungsten composite oxide denitrification catalyst with flower petal structure and preparation method and application of ferro-tungsten composite oxide denitrification catalyst with flower petal structure
  • Ferro-tungsten composite oxide denitrification catalyst with flower petal structure and preparation method and application of ferro-tungsten composite oxide denitrification catalyst with flower petal structure
  • Ferro-tungsten composite oxide denitrification catalyst with flower petal structure and preparation method and application of ferro-tungsten composite oxide denitrification catalyst with flower petal structure

Examples

Experimental program
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Effect test

Example Embodiment

[0044] Example 1

[0045] Weigh 1.9791 g Na 2 WO 4 ·2H 2 O, completely dissolved in 200 mL deionized water, weigh 6.6732 g FeSO 4 ·7H 2 O and 100 mg C 6 H 8 O 6 , Completely dissolved in 100 mL deionized water. Put the tungsten-containing aqueous solution into a constant temperature water bath and keep the temperature at 35 o C. Add the iron-containing aqueous solution dropwise to the vigorously stirred solution, and keep the pH of the mixed solution in the range of 6-10 during the titration. If the pH is lower than this range, add ammonia to adjust, and after the titration, add ammonia to adjust the mixing The pH of the solution was 8, and the stirring was continued for 3 hours. After the reaction, the precipitate was washed with deionized water and ethanol several times until the filtrate became neutral, and the filter cake was placed in a drying box. o C dry for 12 hours, put the dried sample into a muffle furnace for 500 o C was calcined for 5 hours to obtain iron-tungst...

Example Embodiment

[0051] Example 2

[0052] The method is the same as in Example 1, except that the dried sample is placed in a muffle furnace for 800 o C was calcined for 5 hours to obtain iron-tungsten composite oxide. XRD results (see attached Figure 4 ) Shows that the product presents a strong diffraction peak, which is Fe 2 O 3 And Fe 2 WO 6 The mixed phase of the two phases indicates that after the catalyst is calcined at high temperature, the originally highly dispersed iron and tungsten species aggregate to form a highly crystalline stable phase. Photo by SEM (see attached Figure 5 ) It can be seen that the unique flake-like structure of the product has disappeared, and it is completely composed of particles with a particle size of less than 100 nm. ICP-AES determined that its component content is the same as the product of Example 1.

[0053] Weigh 400 mg of the iron-tungsten composite oxide prepared above, compressed into tablets, and sieved 40-60 mesh particles as a catalyst for the d...

Example Embodiment

[0056] Example 3

[0057] The method is the same as in Example 1, except that the soluble iron salt selected is trivalent iron sulfate, and Fe 2 (SO 4 ) 3 9.5971g is used as iron source. XRD results (see attached Image 6 ) Shows that the product has no obvious diffraction peaks, indicating that the catalyst is amorphous. Photo by SEM (see attached Figure 7 ) It can be seen that the product is only made up of particles.

[0058] Weigh 400 mg of the iron-tungsten composite oxide prepared above, press into tablets, sieving 40-60 mesh particles as a catalyst for denitration performance test, the denitration rate test results are shown in Table 3.

[0059]

[0060] It can be seen from the above table: the catalyst is 225-450 o In the temperature range of C, the denitration efficiency is significantly lower than that of the sample in Example 1, only in the range of 250-400 o In the range of C, the denitration efficiency is greater than 90%, while N 2 The selectivity decreased slightly...

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Abstract

The invention discloses a ferro-tungsten composite oxide. The ferro-tungsten composite oxide comprises three elements including ferrum (Fe), tungsten (W) and oxygen, wherein Fe and W are highly dispersed in the composite oxide with molar ratio of (5.8-12.9):1, preferentially, with molar ratio of 6.8:1. The ferro-tungsten composite oxide has a total or partial three-dimensional flower petal structure, and the flower petal structure is composed of multiple petals. The invention also discloses preparation and application of the ferro-tungsten composite oxide. The preparation method is simple and practicable, the adopted precursor is commonly used metal salt such as sulfate, tungstate, is low in cost, is easy to obtain, and can reach industrial production conveniently. The obtained ferro-tungsten composite oxide with the flower petal structure as the denitrification catalyst has high catalytic activity and N2 selectivity, is wide in temperature range, and high in sulfur dioxide and water poisoning resistance, and is used for purifying or eliminating nitric oxide in flue gas from a regular source, diesel exhaust and tail gas from a lean-burning gasoline engine.

Description

technical field [0001] The invention relates to an iron-tungsten composite oxide, in particular to an iron-tungsten composite oxide with a special flake-like structure, a preparation method of the composite oxide and the use of the composite oxide as a fixed source flue gas, diesel vehicle Nitrogen oxides NH in exhaust gas and lean-burn gasoline engine exhaust 3 The application of the SCR catalyst belongs to the technical field of catalytic denitrification. Background technique [0002] Nitrogen oxides (NO x ) is the main pollutant that causes acid rain and photochemical smog, and its emissions mainly come from stationary sources such as coal-fired boilers, industrial furnaces and mobile sources such as motor vehicle exhaust. My country is getting on SO 2 After the phased results of the control, during the "Twelfth Five-Year Plan" period, the NO x The total amount of emission has been controlled, that is, the NO in 2015 x The total emissions decreased by 10% compared wi...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01J35/02B01D53/94B01D53/90B01D53/56
CPCY02T10/12
Inventor 张昭良刘莹周钰浩辛颖李倩
Owner UNIV OF JINAN
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