Plate-type low-temperature catalyst adopting crosslinked nanochain self-assembly porous spherical titanium dioxide as carrier, and preparation method and application thereof

A titanium dioxide, self-assembly technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as poor selectivity, sulfur resistance, and poor activity. Achieve the effects of simple preparation process, low cost, and easy-to-obtain preparation raw materials

Inactive Publication Date: 2017-06-23
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a plate-type low-temperature catalyst with cross-linked nano-chain self-assembled porous spherical titanium dioxide as a carrier and its preparation method and application, wherein: the titanium dioxide has a relatively large specific surface area, and the preparation method adopts Mn-Ce-Co / TiO 2 Low-temperature catalyst, the catalyst has strong denitrification performance and poison resistance; the present invention solves the defects in the prior art that the catalyst has poor activity at medium and low temperature conditions or has certain medium and low temperature activity, but poor selectivity and sulfur resistance , the present invention provides a Mn-Ce-Co / TiO 2 Preparation method of low temperature catalyst and its application in flue gas denitrification

Method used

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  • Plate-type low-temperature catalyst adopting crosslinked nanochain self-assembly porous spherical titanium dioxide as carrier, and preparation method and application thereof
  • Plate-type low-temperature catalyst adopting crosslinked nanochain self-assembly porous spherical titanium dioxide as carrier, and preparation method and application thereof
  • Plate-type low-temperature catalyst adopting crosslinked nanochain self-assembly porous spherical titanium dioxide as carrier, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Dissolve 0.03 mol of ammonium hexafluorotitanate in 140 mL of deionized water, place the solution in a three-necked flask with stirring and heating in an oil bath, place 1 mol of ammonia water in a separatory funnel, and control the dropping rate to 0.5-1 drop / second, At the same time, the mixed solution was rapidly heated to 90 °C and kept at this temperature for 3.5 hours. After the ammonia water was dripped, the reaction was continued for 2 hours. After the reaction was completed, it was naturally cooled to room temperature to obtain product A; the product A was centrifuged, washed, and dried ; The product A was placed in a muffle furnace, heated to 550°C at a rate of 3°C / min, and calcined in an air atmosphere for 2 hours to obtain the final product B.

[0036]Mix 1.25 mol of product B prepared above with 6.5 g of glass fiber in a kneader and stir evenly, and add 5 g of ammonia water. Manganese acetate 0.4mol, cerium nitrate 0.08mol and cobalt nitrate 0.1mol are prep...

Embodiment 2

[0039] Dissolve 0.01 mol of titanium alkoxide in 80 mL of deionized water, place the solution in a three-necked flask with stirring and heating in an oil bath, place 1 mol of urea aqueous solution in a separatory funnel, and control the dropping rate of 0.5-1 drop / second, while Rapidly raise the temperature of the mixed solution to 60°C and keep it at this temperature for 1 hour, continue to react for 2 hours after the urea aqueous solution is dripped, and naturally cool to room temperature after the reaction to obtain product A; centrifuge, wash and dry the product A ; Place the product A in a muffle furnace, heat it to 450°C at a heating rate of 3.5°C / min, and calcinate it in an air atmosphere for 5 hours to obtain the final product B.

[0040] Mix 0.5 mol of product B prepared above with 3 g of glass fiber in a kneader and stir evenly, and add 2 g of ammonia water. 0.1mol of manganese acetate, 0.01mol of cerium nitrate and 0.05mol of cobalt sulfate are prepared into a 30mL ...

Embodiment 3

[0043] Dissolve 0.05 mol of ammonium hexafluorotitanate and titanium alkoxide in 198 mL of deionized water, place the solution in a three-necked flask with stirring and heating in an oil bath, place 1 mol of sodium hydroxide aqueous solution in a separatory funnel, and control the dropping rate 0.5-1 drop / second, at the same time, the mixed solution is rapidly heated to 75°C and kept at this temperature for 6 hours, and the reaction is continued for 2 hours after the aqueous sodium hydroxide solution is dripped, and naturally cooled to room temperature after the reaction, to obtain product A; The product A was centrifuged, washed, and dried; the product A was placed in a muffle furnace, heated to 650°C at a heating rate of 10°C / min, and calcined in an air atmosphere for 3 hours to obtain the final product B.

[0044] Mix 2 mol of product B prepared above with 10 g of glass fiber in a kneader and stir evenly, and add 8 g of ammonia water. Manganese nitrate and manganese acetate...

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Abstract

The invention discloses a plate-type low-temperature catalyst adopting crosslinked nanochain self-assembly porous spherical titanium dioxide as a carrier, and a preparation method and application thereof. The catalyst adopts the crosslinked nanochain self-assembly porous spherical titanium dioxide as the carrier, manganese-cerium-cobalt active ingredients are loaded on the carrier. The method comprises the steps of adopting a titanium precursor and an alkaline solution as raw materials, adopting a controlled release growing method for preparing titanium dioxide, and drying and roasting to obtain special porous titanium dioxide for the catalyst; preparing manganese salt, cerium salt and cobalt salt into a mixed solution, uniformly mixing and stirring ammonium hydroxide, deionized water, glass fiber and the prepared crosslinked nanochain self-assembly porous spherical titanium dioxide, adding the prepared mixed solution for continuously stirring until becoming a uniform paste, coating the paste on a coating line to form the plate-type catalyst, and calcining through a calcining line to obtain a final finished product. According to the plate-type low-temperature catalyst provided by the invention, the adopted prepared titanium dioxide is small in grain size, has a porous structure, and is large in specific surface area; with the doping of cobalt, the denitration activity and the sulfur-resistant toxic amaurosis of the catalyst are improved.

Description

technical field [0001] The invention belongs to the technical field of low-temperature catalytic denitrification, and in particular relates to a plate-type low-temperature catalyst with cross-linked nano-chain self-assembled porous spherical titanium dioxide as a carrier, a preparation method and application thereof. Background technique [0002] At present, the most widely used SCR flue gas denitrification catalyst is mainly V 2 o 5 / TiO 2 and V 2 o 5 -WO 3 / TiO 2 The catalyst has high activity and sulfur resistance, but the activation temperature is 300-450°C. Therefore, the SCR reactor can only be arranged between the economizer and the dust collector, and the domestic existing boilers are in this position Most of them do not reserve denitrification space, which brings great difficulties to the layout of the SCR reactor. At the same time, the undusted flue gas contains a large amount of fly ash, which greatly shortens the life of the catalyst. The cost of the catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/8892
Inventor 陈涛
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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