Method for regenerating arsenic poisoning V2O5-WO3/TiO2 catalyst

A technology of V2O5-WO3 and catalysts, which is applied in the direction of catalyst regeneration/reactivation, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., which can solve the limitations of industrialization promotion, expensive regeneration costs, and the degree of recovery Limited and other problems, to achieve the effect of low regeneration cost, easy access, and restoration of activity

Inactive Publication Date: 2017-06-09
南京智道环境材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the activity of the catalyst regenerated by this method has a certain recovery, the recovery degree is limited, and it is necessary to supplement the active components ammonium metavanadate and ammonium molybdate to enhance the activity.
However, the market price of ammonium metavanadate and ammonium molybdate is relatively high, and the regeneration cost is expensive, so there are certain restrictions on its industrialization.

Method used

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  • Method for regenerating arsenic poisoning V2O5-WO3/TiO2 catalyst
  • Method for regenerating arsenic poisoning V2O5-WO3/TiO2 catalyst
  • Method for regenerating arsenic poisoning V2O5-WO3/TiO2 catalyst

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Embodiment 1

[0019] inactive V 2 o 5 -WO 3 / TiO 2 Catalyst preparation:

[0020] Immersion Simulation V 2 o 5 -WO 3 / TiO 2 Catalyst As poisoning, using 1000ug / ml As standard solution, with the addition of As / V material ratio of 0.1, four honeycomb V 2 o 5 -WO 3 / TiO 2 The catalyst was impregnated in a beaker containing the dilution of the As standard solution for 6 hours with ultrasonic impregnation, left to stand for 6 hours, evaporated to dryness at 150°C, and finally calcined at 300°C for 6 hours in a muffle furnace under an air atmosphere to obtain simulated As Poisoned V 2 o 5 -WO 3 / TiO 2 catalyst.

Embodiment 2

[0022] (1) the section in embodiment 1 is 25 * 25mm, and the number of holes is 3 * 3, and the honeycomb block shape deactivation V that length is 40mm 2 o 5 -WO 3 / TiO 2 After the catalyst is deashed, it is placed in deionized water and cleaned with ultrasonic assistance to remove the toxic components attached to the surface of the catalyst and in the pores. The cleaning time is 60 minutes, the ultrasonic power is 300W, and it is dried at room temperature before use;

[0023] (2) 10g of FeCl 3 Dissolve the powder in 100ml deionized water to make 10mg / ml FeCl 3 Aqueous solution, place the dry deactivated catalyst prepared in step (1) in the solution for ultrasonic treatment for 30 minutes, then let it stand for 6 hours, take it out and drain;

[0024] (3) Take out the catalyst drained in step (2), soak and clean it in water for 3 hours in an ultrasonic cleaner, dissolve the regeneration solution and poisoning components remaining on the surface of the catalyst, then place ...

Embodiment 3

[0026] Change (2) step into the FeCl of 20g in embodiment 2 3 Dissolve the powder in 100ml deionized water to make 20mg / ml FeCl 3 aqueous solution, the rest of the conditions and steps remain unchanged.

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Abstract

The invention discloses a method for regenerating an arsenic poisoning V2O5-WO3/TiO2 catalyst of an SCR (Selective Catalytic Reduction) denitration technique. According to the method, a FeCl3 solution is adopted as a regenerated solution for a regeneration reaction, preferably with the combination of pretreatment such as dust removal and cleaning and aftertreatment such as roasting. By adopting the method, arsenic on the surface of the V2O5-WO3/TiO2 catalyst can be efficiently removed, the activity of the catalyst can be effectively recovered, active components of the catalyst can be effectively retained, and meanwhile the method is simple and convenient to operate, low in regeneration cost and applicable to industrial popularization and application.

Description

technical field [0001] The present invention relates to the field of catalyst regeneration, in particular to V used in arsenic poisoning selective catalytic reduction (SCR) denitration technology 2 o 5 -WO 3 / TiO 2 Catalyst regeneration method. Background technique [0002] Nitrogen oxides (NO X ) as a major air pollutant can not only cause natural disasters such as acid rain, photochemical smog, ozone layer destruction, and greenhouse effect, but also pose a great threat to the health of human beings, animals and plants, and the natural environment. use NH 3 Selective reduction of nitrogen oxides (NOX) to N as a reducing agent 2 The Selective Catalytic Reduction (SCR) method is not only the most widely used, but also relatively mature for the research on its reaction mechanism. [0003] SCR denitrification technology is widely used in the flue gas denitrification of coal-fired power plants. The core and key of the reaction lies in the catalyst. Because the burned coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/92B01D53/86B01D53/56
CPCB01J23/92B01D53/8628B01D2258/0283B01J38/485
Inventor 张亚平徐海涛周长城沈凯宋静
Owner 南京智道环境材料有限公司
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