Vanadium-series loading type high-temperature SCR catalyst and preparation method thereof

An SCR catalyst and supported technology, which is applied in the field of vanadium-based supported high-temperature SCR catalyst and its preparation, can solve the problems of low mechanical strength, high activation temperature, and narrow temperature window of the catalyst, so as to broaden the activation temperature window, start The effect of lowering the active temperature and improving the denitrification efficiency

Inactive Publication Date: 2014-12-17
SOUTHEAST UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

There are many problems in the engineering application of SCR selective catalytic reduction catalysts based on it, mainly in the following three aspects: (1) The temperature window is narrow, the activation temperature is relatively high, and the reaction of this type of catalyst at low temperature The activity is low; (2) the H contained in the flue gas 2 O, SO 2 And metals such as Hg will affect the acid site of the catalyst and the surface state of the active species, thereby having a certain impact on the activity; (3) The use cost of the catalyst is high, and the mechanical strength of the vanadium / titanium catalyst is not high and the service life is short
[0005] At present, there are few studies on catalysts supported by titanium-tin solid solution at home and abroad, and the structure of its surface and its mechanism of action in catalysis are still not very clear.

Method used

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  • Vanadium-series loading type high-temperature SCR catalyst and preparation method thereof
  • Vanadium-series loading type high-temperature SCR catalyst and preparation method thereof
  • Vanadium-series loading type high-temperature SCR catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: TiO 2 -SnO 2 Preparation of support (Ti-Sn).

[0028] TiO 2 -SnO 2 Carrier Preparation: Co-precipitation method was used to prepare TiO with a molar ratio of 1:1 2 -SnO 2 composite oxides. Tin tetrachloride pentahydrate (AR, produced by Sinopharm Chemical Reagent Co., Ltd.), titanium tetrachloride (TiCl 4 ) solution (AR, density 1.73g / ml, produced by Shanghai Lingfeng Chemical Reagent Co., Ltd.), ammonia water (AR, 28wt%, produced by Shanghai Pilot Chemical Corporation), and deionized water as raw materials. Weigh 15.2051g SnCl 4 ·5H 2 O, add a small amount of water to dissolve it and transfer it into a 400ml large beaker, measure 4.7558ml TiCl 4 , under an ice-water bath, transfer to a 400ml large beaker at a rate of 1ml / min while stirring. Turn on the mechanical stirring at a stirring rate of 45 r / s, and slowly add ammonia water dropwise. After the drop is complete and stir for 30 minutes, the measured pH can be between 9 and 10. After the reacti...

Embodiment 2

[0029] Example 2: 1%V 2 o 5 / TiO 2 -SnO 2 Preparation of catalyst (V / Ti-Sn).

[0030] Carrier pretreatment: take 2 g of the titanium-tin solid solution prepared in Example 1 and dissolve it in 50 ml of deionized water to obtain an aqueous solution of the titanium-tin solid solution;

[0031] The loading of vanadium oxide with a mass percentage of 1.00%: add 0.0260g NH to the aqueous solution of the above-mentioned titanium-tin solid solution 4 VO 3 (ammonia metavanadate), 1~2g oxalic acid needs to be added during the preparation process to promote the dissolution of ammonium metavanadate; stir evenly at 40~50r / s for 2 hours at 20°C, then stir at 85°C until the water is basically evaporated to dryness ( It usually takes about 4 hours); after the water is basically evaporated to dryness, take it out, put it in an oven, dry it at 110°C for 12 hours, take it out, grind it and pass it through a 60 mesh sieve; put it in a muffle furnace and calcinate it at 450°C for 4h to obtai...

Embodiment 3

[0032] Example 3: 1% V 2 o 5 -0.1CeO 2 / TiO 2 -SnO 2 Preparation of catalyst (1%V-0.1Ce / Ti-Sn).

[0033] Carrier pretreatment: Carrier pretreatment: take 2 g of the titanium-tin solid solution prepared in Example 1 and dissolve it in 50 ml of deionized water to obtain an aqueous solution of the titanium-tin solid solution;

[0034] The loading of cerium oxide with a molar ratio of 0.1: add 0.3765g Ce(NO 3 ) 3 ·6H 2 O, stir evenly at 40~50r / s at 20°C for 2 hours, then stir at 85°C until the water is basically evaporated to dryness (usually about 4 hours); after the water is basically evaporated to dryness, take it out and put it in an oven at 110°C Dry at 450°C for 4 hours in a muffle furnace to obtain 0.1CeO 2 / TiO 2 -SnO 2 Catalyst, after grinding and passing through a 60-mesh sieve, it is standby, wherein, 0.1 represents CeO 2 / TiO 2 -SnO 2 CeO in the catalyst 2 with TiO 2 -SnO 2 The molar ratio is 0.1.

[0035] Loading of vanadium oxide with a mass percenta...

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Abstract

The invention discloses a vanadium-series loading type high-temperature SCR catalyst. The vanadium-series loading type high-temperature SCR catalyst takes a titanium tin oxide as a carrier, takes an oxide of vanadium as an active component and takes an oxide of cerium as a cocatalyst, wherein the mol ratio of cerium to titanium to tin in the catalyst is (0.1-0.3) to 1 to 1; and the mass of the oxide of vanadium accounts for 1% of the whole mass of the catalyst. The invention further discloses a preparation method of the catalyst. Compared with a single vanadium-based catalyst, the vanadium-series loading type high-temperature SCR catalyst has the advantages that CeO2 is added, so that the heat resistance of the catalyst is improved; the reduction temperature of the catalyst is reduced and the denitration efficiency is improved; a selective catalytic reduction denitration active temperature window is widened; and the modification effect on a V2O5/TiO2-SnO2 catalyst is very good.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a high-temperature denitrification SCR reaction catalyst for flue gas in a thermal power plant, in particular to a vanadium-based loaded high-temperature SCR catalyst and a preparation method thereof. Background technique [0002] In my country, the coal-based primary energy production and consumption structure has brought serious environmental pollution problems. Among them, the pollution of nitrogen oxides has been increasing, and photochemical smog pollution has even appeared in some areas. At present, the emissions of nitrogen oxides from thermal power plants account for about half of the total emissions of nitrogen oxides in the country. With the continuous increase of the number of thermal power plants, the emissions and proportion of nitrogen oxides from thermal power plants will continue to rise. Controlling the emission of nitrogen oxides has become a key pollution cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01D53/90B01D53/56
Inventor 张亚平郭婉秋王龙飞沈凯徐海涛周长城
Owner SOUTHEAST UNIV
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