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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

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 performance, but Fe-based catalysts usually have a high denitrification activity temperature, poor water and sulfur resistance and thermal stability, and the preparation process is complicated, which limits their large-scale industrial application.

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
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 1.9791 g Na 2 WO 4 2H 2 O, completely dissolved in 200 mL deionized water, weighed 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 drop by drop into the vigorously stirred solution, and keep the pH of the mixed solution in the range of 6-10 during the titration process. If the pH is lower than this range, add ammonia water to adjust. After the titration is completed, add ammonia water to adjust the mixture The pH of the solution was 8, and the stirring was continued for 3 hours. After the reaction, wash the precipitate with deionized water and ethanol several times until the filtrate is neutral, and put the filter cake in a drying box for 70 o C dried for 12 hours, and the dried sample was placed in a muffle furnace at 500 o C roasting for 5 ho...

Embodiment 2

[0052] Identical with embodiment 1 method, difference is: the sample after drying is put into muffle furnace 800 o C roasting 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 shows that after the catalyst is calcined at high temperature, the original highly dispersed iron and tungsten species aggregate to form a stable phase with high crystallinity. photo by SEM (see attached Figure 5 ) It can be seen that the unique flake-like structure of the product disappears, and it is completely composed of particles, and the particle size is less than 100 nm. ICP-AES confirms that its component content is identical with embodiment 1 product.

[0053] Weigh 400 mg of the above-prepared iron-tungsten composite oxide, press it into tablets, and sieve out 40-60 mesh particles as a catalyst for denitration performance t...

Embodiment 3

[0057] Identical with embodiment 1 method, difference is: the soluble iron salt of selection is ferric sulfate, takes by weighing Fe 2 (SO 4 ) 3 9.5971g as iron source. XRD results (see attached Figure 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 composed of particles.

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

[0059]

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

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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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