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Method for regenerating arsenic poisoning SCR denitration catalyst

A denitrification catalyst and arsenic poisoning technology, applied in the field of environmental protection technology and denitrification catalysis, can solve the problems of active component dissolution and loss, catalyst high-temperature sintering, catalyst secondary poisoning, etc., and achieve specific surface area recovery, catalytic activity recovery, and favorable activity Effect

Active Publication Date: 2017-12-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Looking at the existing arsenic poisoning catalyst regeneration methods, it can be found that the wet regeneration technology has a relatively excellent arsenic removal effect, but it is often accompanied by the secondary poisoning of the catalyst and the loss of a large amount of active components; thermal reduction regeneration can be very good Avoid the above shortcomings, but the existing thermal reduction regeneration process needs to be carried out at extremely high temperature, so there are also phenomena such as high-temperature sintering of the catalyst and destruction of active sites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 has described a kind of regeneration method of arsenic poisoning SCR denitrification catalyst, and its specific steps include:

[0023] (1) Select the arsenic-poisoned vanadium-molybdenum-titanium honeycomb SCR denitrification catalyst, firstly perform mechanical deashing on it, and then blow it with 2Mpa clean and dry compressed air for 1 hour to remove the ash accumulation on the surface of the catalyst and in the pores, and cut it to a height of 60mm 5×5-hole catalyst block, then soak it in sufficient deionized water, and at the same time pass through the ozone-air mixture with an ozone concentration of 80mg / L, and clean it with ultrasonic vibration at 40°C for 20min;

[0024] (2) Move the catalyst treated in step (1) to a sufficient amount of pre-prepared 0.25mol / L monoethanolamine solution for soaking and cleaning for 40 minutes, and intermittently stir during the cleaning process;

[0025] (3) Rinse the catalyst treated in step (2) repeatedly with deion...

Embodiment 2

[0029] Embodiment 2 has also described a kind of regeneration method of arsenic poisoning SCR denitrification catalyst, and its specific steps include:

[0030] (1) Select the arsenic-poisoned vanadium-molybdenum-titanium honeycomb SCR denitrification catalyst, firstly perform mechanical deashing on it, and then blow it with 2Mpa clean and dry compressed air for 1 hour to remove the ash accumulation on the surface of the catalyst and in the pores, and cut it to a height of 60mm 5×5-hole catalyst block, then soak it in sufficient deionized water, and at the same time pass through the ozone-air mixture with an ozone concentration of 80mg / L, and clean it with ultrasonic vibration at 40°C for 20min;

[0031] (2) Move the catalyst treated in step (1) to a sufficient amount of pre-prepared 0.5mol / L monoethanolamine solution for immersion and cleaning for 30 minutes, and perform intermittent stirring during the cleaning process;

[0032] (3) Rinse the catalyst treated in step (2) rep...

Embodiment 3

[0036] Embodiment 3 also describes a regeneration method of an arsenic poisoning SCR denitration catalyst, and its specific steps include:

[0037] (1) Select the arsenic-poisoned vanadium-molybdenum-titanium honeycomb SCR denitrification catalyst, firstly perform mechanical deashing on it, and then blow it with 2Mpa clean and dry compressed air for 1 hour to remove the ash accumulation on the surface of the catalyst and in the pores, and cut it to a height of 60mm 5×5 hole catalyst block, then soak it in a sufficient amount of deionized water, and at the same time pass through the ozone-air mixture with an ozone concentration of 120mg / L, and clean it with ultrasonic vibration at 40°C for 16min;

[0038] (2) Move the catalyst treated in step (1) to a sufficient amount of pre-prepared 0.75mol / L monoethanolamine solution for soaking and cleaning for 20 minutes, and intermittently stir during the cleaning process;

[0039] (3) Rinse the catalyst treated in step (2) repeatedly wit...

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Abstract

The invention belongs to the technology of environmental protection and the field of catalytic denitration, and particularly relates to a method for regenerating an arsenic poisoning SCR denitration catalyst. The method comprises the following steps: blowing dust and removing impurities for an arsenic poisoning SCR denitration catalyst; performing ultrasonic cleaning with deionized water under a condition of introducing ozone-air mixed gas; soaking and cleaning with an alkalescence solution; performing two-stage gradient reduction by adopting different reductive gases at different temperatures; and quickly heating and roasting in the air to obtain a regenerated catalyst. After the arsenic poisoning SCR denitration catalyst is regenerated by adopting the method, the denitration efficiency is recovered to the level of fresh catalyst, the arsenic removal rate is over 99 percent, and the arsenic positioning resistance of the regenerated catalyst can be greatly promoted. Furthermore, the method is simple in process, has relatively strong operability, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of environmental protection technology and denitrification catalysis, and in particular relates to a regeneration method of an arsenic poisoning SCR denitrification catalyst. Background technique [0002] Selective catalytic reduction (SCR) denitrification method has the advantages of high denitrification efficiency, good selectivity and perfect technology, and is currently the most widely used flue gas denitrification technology. Catalyst is the core of SCR denitrification technology, and its performance directly affects the overall denitrification effect of the SCR system. However, in the actual use process, due to the very harsh working environment, the catalyst is deactivated due to wear, clogging, poisoning or sintering, etc., resulting in a significant reduction in denitration efficiency. When the catalyst cannot meet the overall denitration performance requirements of the SCR system, it is necessary to timely ...

Claims

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Application Information

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IPC IPC(8): B01J23/92B01J35/04B01J38/14B01J38/64B01J38/66B01J38/04B01J38/10B01J38/02B01D53/88B01D53/56
CPCB01D53/565B01D53/8628B01D53/88B01J23/002B01J23/92B01J38/02B01J38/04B01J38/10B01J38/14B01J38/64B01J38/66B01D2258/0283B01D2257/40B01J2523/00B01J35/56B01J2523/47B01J2523/52B01J2523/55B01J2523/68
Inventor 陆强唐昊李慧杨江毅李文艳董长青杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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