A medium and low temperature vanadium-titanium-based SCR denitration catalyst and preparation method thereof

A denitration catalyst, vanadium-titanium-based technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical elements of heterogeneous catalysts, etc. And other issues

Active Publication Date: 2022-07-29
浙江盛旺环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a medium-low temperature vanadium-titanium-based SCR denitrification catalyst to solve the problems that the existing vanadium-titanium-based SCR denitrification catalyst cannot cover low temperature and medium temperature regions at the same time, high vanadium content, and low-temperature sulfur poisoning.

Method used

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  • A medium and low temperature vanadium-titanium-based SCR denitration catalyst and preparation method thereof
  • A medium and low temperature vanadium-titanium-based SCR denitration catalyst and preparation method thereof

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preparation example Construction

[0040] The preparation method of the medium-low temperature vanadium-titanium-based SCR denitration catalyst specifically includes the following steps:

[0041] 1S: Preparation of TiO 2 -SiO 2 carrier:

[0042]The glass microbeads, the first auxiliary agent, the second auxiliary agent, the alkali and the water are mixed, reacted at 20 to 80 ° C for 0.5 to 24 hours, and then filtered, washed and dried; wherein, the glass microbeads, the first auxiliary agent The water-solid ratio of the additive, the second additive and water is 0.05-0.5, the content of glass microbeads is 80-94.5%, the first additive is 2-5%, and the second additive is 0.5-18%; the alkali content is 1-94.5%. 7%; then the SiO 2 The base carrier and deionized water are prepared into a 5-20% suspension, the titanium donor and anhydrous ethanol are prepared into a solution with a titanium donor concentration of 0.2-5 mol / L, and then the suspension and the titanium solution are placed in the solution. After mix...

Embodiment 1

[0052] 1S: Preparation of TiO 2 -SiO 2 carrier:

[0053] Artificial glass microbeads, Ca(OH) 2 , sodium silicate and water are mixed according to the water-solid ratio of 0.15 and the alkali content of 2%. Among them, artificial glass beads, Ca(OH) 2 The contents of sodium silicate and sodium silicate are 80%, 5%, and 15% respectively; react at 40 ° C for 2 h, filter, wash, and dry for later use, thereby obtaining activated glass beads, namely SiO 2 base carrier. Then the SiO 2 The base carrier and deionized water are prepared into a 5% suspension, titanium tetrachloride and anhydrous ethanol are prepared into a solution with a titanium donor concentration of 0.5mol / L, and then the suspension and the titanium solution are mixed within 3h After completion, the pH value was controlled by hydrochloric acid to be 4, and the temperature was 60° C. After the reaction was carried out for 1 hour, it was allowed to stand for aging for 12 hours. Finally, the reaction product was f...

Embodiment 2

[0060] 1S: Preparation of TiO 2 -SiO 2 carrier:

[0061] The fly ash precipitated beads, calcium gluconate, sodium metasilicate and water are mixed according to the water-solid ratio of 0.05 and the alkali content of 3%. are 85%, 3%, and 12%; react at 50°C for 12 hours, filter, wash, and dry for later use, thereby obtaining activated glass beads, namely SiO 2 base carrier. Then the SiO 2 The base carrier and deionized water are prepared into an 8% suspension, titanium oxysulfate and anhydrous ethanol are prepared into a solution with a titanium donor concentration of 2.5mol / L, and then the suspension and the titanium solution are mixed within 2h. , the pH value was controlled to be 6 by hydrochloric acid, and the reaction temperature was 60 °C for 8 h, and then allowed to stand for 24 h. Finally, the reaction product was filtered and washed until the filtrate was clear, dried at 90°C, and calcined at 600°C for 2 h to obtain TiO 2 -SiO 2 vector.

[0062] TiO in this com...

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Abstract

The invention discloses a medium and low temperature vanadium-titanium-based SCR denitration catalyst, comprising TiO 2 ‑SiO 2 Carrier, effective component, vanadium donor; the TiO 2 ‑SiO 2 The carrier is prepared by a heterogeneous precipitation method; the effective component is at least one of transition metal active components, or at least one of rare earth element active components; the precursor of the vanadium donor is a soluble vanadium salt, Specifically, it is at least one of sodium metavanadate, ammonium metavanadate and potassium metavanadate. The catalyst has a hollow spherical coating structure. By constructing a hollow spherical coating structure composite carrier and adding active components, the heat resistance of the catalyst is improved, the reduction temperature of the catalyst is lowered, the denitration efficiency is improved, and its selective catalytic reduction and denitration activity is broadened. temperature window, to V 2 O 5 / TiO 2 ‑SiO 2 The catalyst has a good modification effect.

Description

technical field [0001] The invention belongs to the field of reducing atmospheric pollutants in the cement industry, and particularly relates to a medium-low temperature vanadium-titanium-based SCR denitration catalyst and a preparation method. Background technique [0002] Different concentrations of nitrogen oxides (NOx) are unavoidably emitted from industrial kilns and motor vehicles. Following SO 2 Since then, NOx has become one of the main air pollutants, with an annual emission of more than 10 million tons; it will cause many environmental problems such as acid rain and photochemical smog, and also seriously endanger human health. The most mature selective catalytic reduction and denitrification technology (SCR) is mainly used for the removal of NOx from fixed sources such as industrial kilns in the world. The SCR catalyst is the core component of the technology, and its chemical composition and physical structure have a crucial impact on the denitration efficiency. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01D53/86B01D53/56B01D53/60
CPCB01J23/22B01J23/002B01D53/8628B01D53/8637B01J2523/00B01J2523/41B01J2523/47B01J2523/55
Inventor 汪澜盛斌卢蓓盛树堂李冰冰孙花英
Owner 浙江盛旺环保科技有限公司
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