Regeneration method of lead poisoning Mn-Ce carbon-based SCR low-temperature denitration catalyst

A denitrification catalyst and low-temperature denitrification technology, applied in the direction of catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of unsatisfactory regeneration effect of Mn-Ce carbon-based low-temperature denitrification catalyst, deactivation mechanism and There are few researches on the regeneration method, and the active components V and W cannot be supplemented, etc., so as to restore the low-temperature denitrification activity, improve the anti-lead poisoning performance, and improve the effect of anti-lead poisoning ability

Pending Publication Date: 2021-01-29
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Although this method removes the lead that leads to catalyst deactivation through the complexation of triethylenetetramine and PbO, so that the denitrification activity of the catalyst is restored to a certain extent, but the lost active components V and W cannot be replenished.
Moreover, this method does not improve the anti-poisoning ability of the catalyst accordingly, which leads to the fact that the regenerated catalyst is easily deactivated by lead poisoning again during use, which reduces the service life of the catalyst after regeneration
In addition, this method is mainly aimed at the lead poisoning deactivation regeneration of commercial vanadium-based catalysts, and the regeneration effect on lead-poisoned Mn-Ce carbon-based low-temperature denitrification catalysts is not ideal.
[0006] At present, there are few studies on the deactivation mechanism and regeneration methods of heavy metal lead poisoning. The research on the deactivation mechanism and regeneration process of lead poisoning is of great significance to reduce the operating cost of denitrification systems (especially low-temperature flue gas denitrification systems)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The test sample taken is lead poisoned Mn-Ce activated coke low-temperature denitrification catalyst, which is prepared by impregnation method. Lead content: 0.5wt%.

[0032] (1) Configure active replenishment liquid and anti-toxic inhibitory liquid. The raw material components of the active supplement liquid are manganese nitrate and cerium nitrate hexahydrate, and the rest are water. The concentration of manganese nitrate and cerium nitrate hexahydrate in the active supplement solution is 1.0mol / L. The anti-toxic inhibitor solution contains niobium oxalate at a concentration of 0.5mol / L. According to the volume ratio of 1:1, weigh and mix the prepared active replenishing liquid and anti-drug inhibitory liquid respectively, and stir them mechanically for 30 minutes to make them evenly mixed.

[0033] The regeneration steps of lead-poisoned Mn-Ce activated coke low-temperature denitrification catalyst are as follows:

[0034] (2) The lead-poisoned Mn-Ce activated co...

Embodiment 2

[0040] The test sample taken is lead poisoned Mn-Ce activated coke low-temperature denitrification catalyst, which is prepared by impregnation method. Lead content: 0.5wt%.

[0041](1) Configure active replenishment liquid and anti-toxic inhibitory liquid. The raw material components of the active supplement liquid are manganese nitrate and cerium nitrate hexahydrate, and the rest are water. The concentration of manganese nitrate and cerium nitrate hexahydrate in the active supplement solution is 2.0mol / L. The anti-toxic inhibitor solution contains niobium oxalate at a concentration of 1.0mol / L. According to the volume ratio of 1:1, weigh and mix the prepared active replenishing liquid and anti-drug inhibitory liquid respectively, and stir them mechanically for 30 minutes to make them evenly mixed.

[0042] The regeneration steps of lead-poisoned Mn-Ce activated coke low-temperature denitrification catalyst are as follows:

[0043] (2) The lead-poisoned Mn-Ce activated cok...

Embodiment 3

[0049] The test sample taken is lead poisoned Mn-Ce activated coke low-temperature denitrification catalyst, which is prepared by impregnation method. Lead content: 0.5wt%.

[0050] (1) Configure active replenishment liquid and anti-toxic inhibitory liquid. The raw material components of the active supplement liquid are manganese nitrate and cerium nitrate hexahydrate, and the rest are water. The concentration of manganese nitrate and cerium nitrate hexahydrate in the active supplement solution is 2.0mol / L. The anti-toxic inhibitor solution contains niobium oxalate at a concentration of 1.0mol / L. According to the volume ratio of 1:1, weigh and mix the prepared active replenishing liquid and anti-drug inhibitory liquid respectively, and stir them mechanically for 30 minutes to make them evenly mixed.

[0051] The regeneration steps of lead-poisoned Mn-Ce activated coke low-temperature denitrification catalyst are as follows:

[0052] (2) The lead-poisoned Mn-Ce activated co...

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Abstract

The invention aims to provide a regeneration method of a Mn-Ce carbon-based low-temperature denitration catalyst poisoned by a lead component in sintering flue gas, which can simply and efficiently remove the lead in the denitration catalyst, supplement the damaged active component at the same time, and improve the lead poisoning resistance of the regenerated catalyst. The method is simple and convenient to operate, the denitration rate of the regenerated catalyst can be recovered to be close to the level of a fresh catalyst, and the regeneration effect is remarkable.

Description

technical field [0001] The invention relates to the field of regeneration of poisoned catalysts, in particular to a method for regeneration of Mn-Ce carbon-based catalysts for selective catalytic reduction (SCR) denitrification of lead poisoning. Background technique [0002] Environmental protection is an urgent problem to be solved in the process of transformation and upgrading of my country's iron and steel industry. As a typical high energy consumption, high pollution, resource-based industry, the air pollutants emitted by iron and steel enterprises include SO 2 , NO x , dust, heavy metals and dioxins, etc., and mainly come from the sintering process. Currently, steel mill dust and SO 2 The emission control technology of China has matured, and the NO mainly produced in the sintering process x (more than 50%) has become the most urgent pollutant in the gaseous pollutants of iron and steel enterprises. The Ministry of Ecology and Environment issued the "Opinions on Pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J38/64B01J38/52B01J38/02B01D53/86B01D53/56
CPCB01J23/34B01J38/64B01J38/52B01J38/02B01J38/485B01D53/8628B01D2258/0283
Inventor 任山苏增辉孙亚丽杨剑黄新周强阳杰王明明陈志超
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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