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Preparation method of catalyst for denitration and dioxin degradation

A catalyst and denitrification technology, applied in chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of inability to remove dioxins, low denitrification efficiency, and low denitrification efficiency. Achieve high dioxin removal rate, increase NO conversion rate, and reduce the effect of denitrification reaction temperature

Active Publication Date: 2022-05-06
SHENZHEN HUAMING ENVIRONMENTAL PROTECTION TECH CO LTD
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Problems solved by technology

The core of SCR technology is the denitrification catalyst. At present, SNCR-SCR combination (SNCR, selective non-catalytic reduction method) is commonly used. Although the above research and practice have achieved good results, this system is still not systematically studied. And it faces the disadvantage of low denitrification efficiency at relatively low temperature, which makes the denitrification efficiency not high. In addition, the catalyst cannot remove dioxins

Method used

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  • Preparation method of catalyst for denitration and dioxin degradation
  • Preparation method of catalyst for denitration and dioxin degradation
  • Preparation method of catalyst for denitration and dioxin degradation

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preparation example Construction

[0026] see figure 1 , the present invention proposes a preparation method of a catalyst for denitrification and degradation of dioxins, comprising the following steps:

[0027] S10. After ball-milling praseodymium nitrate hexahydrate and titanium dioxide, dropwise adding an aqueous solution of polyethylene glycol to continue ball-milling, then drying and calcining to obtain an intermediate.

[0028] This step mainly prepares the intermediate praseodymium / titanium oxide carrier, polyethylene glycol is preferably polyethylene glycol 4000, and its function is a dispersant, that is, it can stabilize some small particles of the intermediate that have just been ground in time during the ball milling process. In the embodiment of the present invention, the amount of polyethylene glycol 4000 added is relatively small, and the mass fraction of the aqueous solution of polyethylene glycol 4000 is 10%.

[0029] The conditions of drying and calcination are not limited in the present inven...

Embodiment 1

[0052] (1) After 4.35 parts of praseodymium nitrate hexahydrate and 32 parts of titanium dioxide were placed in a ball mill and mixed for 30 minutes, the aqueous solution (10wt.%) of 0.05 parts of polyethylene glycol 4000 was added dropwise to the ball mill to continue ball milling for 30 minutes. drying at 450°C for 1 hour and calcining at 450°C for 3 hours to obtain an intermediate;

[0053] (2) Under stirring conditions, add 1.25 parts of oxalic acid to 40 parts of water to form an aqueous solution of oxalic acid, mix 0.58 parts of ammonium metavanadate, 0.01 part of silver tungstate, and 1.1 parts of ammonium metatungstate (tungsten content 65wt. %) and 14.3 parts of intermediates were added to the aqueous solution of oxalic acid, and after reacting for 2 hours, a mixed solution was obtained;

[0054] (3) Remove moisture from the mixed solution to obtain a solid, dry the solid at 110°C for 1 hour, calcinate at 250°C for 1 hour, and then calcinate at 450°C for 3 hours to ob...

Embodiment 2

[0056] (1) After 4.35 parts of praseodymium nitrate hexahydrate and 32 parts of titanium dioxide were placed in a ball mill and mixed for 30 minutes, the aqueous solution (10wt.%) of 0.05 parts of polyethylene glycol 4000 was added dropwise to the ball mill to continue ball milling for 30 minutes. drying at 450°C for 1 hour and calcining at 450°C for 3 hours to obtain an intermediate;

[0057] (2) Under stirring conditions, 1.25 parts of oxalic acid are added to 40 parts of water to form an aqueous solution of oxalic acid, 0.58 parts of ammonium metavanadate, 0.05 parts of silver tungstate, 1.1 parts of ammonium metatungstate (tungsten content 65wt.%) ) and 14.3 parts of intermediates were added to the aqueous solution of oxalic acid respectively, and after 2 hours of reaction, a mixed solution was obtained;

[0058] (3) Remove moisture from the mixed solution to obtain a solid, dry the solid at 110°C for 1 hour, calcinate at 250°C for 1 hour, and then calcinate at 450°C for 3...

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Abstract

The invention discloses a preparation method of a catalyst for denitration and dioxin degradation, and relates to the technical field of catalysts. The preparation method of the catalyst for denitration and dioxin degradation comprises the following steps: S10, mixing praseodymium nitrate hexahydrate and titanium dioxide, carrying out ball milling, dropwise adding an aqueous solution of polyethylene glycol, continuously carrying out ball milling, drying, and calcining to obtain an intermediate; s20, ammonium metavanadate, tungstate of precious metal, ammonium metatungstate and the intermediate are added into an aqueous solution of oxalic acid respectively, and a mixed solution is obtained after reaction; and S30, removing moisture from the mixed solution to obtain a solid, and drying and calcining the solid to obtain the catalyst for denitration and dioxin degradation. According to the invention, Pr (III) and noble metal are doped into the catalyst V2O5 / WO3 / TiO2, so that higher denitration efficiency, lower ammonia escape and higher dioxin removal rate of SCR (Selective Catalytic Reduction) under the condition of 210 DEG C are realized.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for preparing a catalyst for denitration and degradation of dioxins. Background technique [0002] Selective catalytic reduction (SCR) technology is currently the most popular denitrification technology, widely used in coal-fired power plants at home and abroad. The core of SCR technology is the denitrification catalyst. At present, SNCR-SCR combination (SNCR, selective non-catalytic reduction method) is commonly used. Although the above research and practice have achieved good results, this system is still not systematically studied. And it faces the disadvantage of low denitrification efficiency at relatively low temperature, which makes the denitrification efficiency not high. In addition, the catalyst cannot remove dioxins. Contents of the invention [0003] The main purpose of the present invention is to propose a method for preparing a catalyst for denitration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01J23/888B01D53/86B01D53/56B01D53/58B01D53/72
CPCB01J23/687B01J23/888B01J23/002B01D53/8628B01D53/8634B01D53/8668B01J2523/00B01D2257/404B01D2257/406B01D2257/708B01D2258/0283B01J2523/18B01J2523/3718B01J2523/47B01J2523/55B01J2523/69B01J2523/17Y02A50/20
Inventor 陈镖
Owner SHENZHEN HUAMING ENVIRONMENTAL PROTECTION TECH CO LTD
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