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Preparation method of cooperating catalyst for demercuration and denitration

A catalyst, SCR catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of reducing the mechanical strength of the catalyst, high service temperature, secondary pollution, etc., and achieve good mercury and denitrification performance , good low-temperature performance, and the effect of prolonging the service life

Active Publication Date: 2016-05-18
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Patent document CN104289258A discloses a regeneration technology of pickling regeneration solution for denitrification catalysts. The pickling regeneration solution used is composed of a large amount of acid solution plus 1wt‰~10wt‰ of surfactant, which will cause secondary pollution of sulfuric acid wastewater. Secondary pollution and poisoning of alum sulfate and ammonium metatungstate, and the efficiency after regeneration is generally the highest and can only reach about 40% before regeneration
Patent document CN104815675A discloses selective catalytic reduction denitrification catalyst and its regeneration method and application. The poisoned SCR catalyst is first purged with high-pressure nitrogen, and then immersed in dilute nitric acid solution with a mass concentration of 15%, cerium salt and lanthanum salt in sequence In the mixed solution and zirconium oxychloride solution, this method also uses strong acid, which not only reduces the mechanical strength of the catalyst, but also produces more waste acid, which is easy to cause secondary pollution
And the catalyst active component after the above-mentioned method regeneration is still V 2 o 5 , mainly used between the economizer and the preheater, the service temperature is high, and the service life after regeneration is short

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  • Preparation method of cooperating catalyst for demercuration and denitration

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preparation example Construction

[0021] The invention provides a method for preparing a synergistic catalyst for demercuration and denitrification, comprising the following steps:

[0022] (1) First, wash or blow with water to remove the ash on the surface of the deactivated SCR catalyst; then soak the deactivated SCR catalyst in the divalent manganese salt solution, so that the deactivated SCR catalyst can fully absorb Valence manganese ion, wherein, the divalent manganese salt is manganese nitrate Mn(NO 3 ) 2 Or manganese acetate MnAc, etc., the concentration of divalent manganese ions in the divalent manganese salt solution is 0.5mol / L-2.5mol / L; the longer the soaking time, the more sufficient the adsorption, usually 12h-36h is required, and the higher the concentration of manganese salt If the concentration is high, the soaking time can be reduced. For example, when the concentration of manganese salt is 1mol / L, it needs to be soaked for 24h; , the impregnation time is too long will affect the mechanica...

Embodiment 1

[0025] Embodiment 1 contains 3.5% mass fraction MnO x The preparation method of the new catalyst

[0026] (1) First deactivate the commercial SCR catalyst V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Perform water washing and regeneration treatment to remove the ash on the surface of the catalyst; then immerse the de-ashed SCR catalyst module (150mm×150mm×1000mm) in 100L, 1mol / L manganese nitrate aqueous solution for 24 hours.

[0027] (2) The catalyst obtained in step (1) was dried at 105°C for 24 hours, and then calcined at 500°C for 5 hours in an air atmosphere to obtain MnO x The mass fraction is 3.5% (first calculate the quality of Mn by elemental analysis, and then use MnO 2 As the theoretical composition, converted to MnO x mass) of MnO x / DSCR, denoted as 3.5wt% MnO x / DSCR.

Embodiment 2

[0028] Embodiment 2 contains 6% mass fraction MnO x The preparation method of the new catalyst

[0029] Repeat embodiment 1 with described identical steps, difference is, after described step (2), then the 3.5wt%MnO that step (2) obtains x / DSCR, immersed in 100L, in the manganese nitrate aqueous solution of 1mol / L, leave standstill for 24 hours; And repeat step (2), obtain 6wt%MnO x / DSCR.

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Abstract

The invention discloses a preparation method of a cooperating catalyst for demercuration and denitration. Firstly, an inactivated SCR (selective catalytic reduction) catalyst is soaked in a divalent manganese salt solution, so that the inactivated SCR catalyst fully adsorbs divalent manganese ions; then the inactivated SCR catalyst is dried and calcined at 300-600 DEG C until the divalent manganese ions are completely converted into MnOx; Steps (1) and (2) are repeated until the mass fraction of manganese elements in the inactivated SCR catalyst is 0.5% or more, and the cooperating catalyst for demercuration and denitration is obtained. With the adoption of the method, the inactivated SCR catalyst can be regenerated, and the main active component of the regenerated cooperating catalyst for demercuration and denitration is MnOx and can be applied to areas after dust removal equipment and before wet desulfurization equipment of a power plant for cooperating removal of mercury and NOx, so that the service life of the SCR catalyst is prolonged.

Description

technical field [0001] The invention belongs to the fields of solid waste reuse and air pollution purification, and more specifically relates to a preparation method of a mercury and denitrification synergistic catalyst. Background technique [0002] my country is a large coal-producing country in the world, with coal production accounting for 37% of the world's total. It is also a large coal-burning country. Coal is the main energy consumption, and the proportion of coal in the energy structure is as high as 75%. The pollutants produced by coal-fired NO x and mercury have long attracted widespread attention. In order to save costs, the current mainstream technology is to use existing pollutant control devices to remove the two together. [0003] Selective catalytic reduction (SCR, selectivecatalyticreduction) is currently the most widely used and most effective flue gas denitrification technology at home and abroad, and now commercial SCR catalysts have been widely used. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56B01D53/64
CPCB01D53/865B01D53/8665B01J23/34
Inventor 刘小伟周子健廖志强韩金克徐明厚
Owner HUAZHONG UNIV OF SCI & TECH