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

A low-temperature denitrification and catalyst technology, which is applied in the direction of catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems that emissions are difficult to meet stringent standards and the recovery of denitrification activity is not ideal, and achieve Low cost, easy to obtain, and suitable for industrial promotion

Pending Publication Date: 2020-12-11
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In June 2017, the Ministry of Environmental Protection of the People's Republic of China issued the revised standard of "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standards", which included NO x The emission limit by 300mg / Nm 3 Upgraded to 100mg / Nm 3 , resulting in most of my country's iron and steel enterprises NO x Difficult to meet stringent standards for emissions
Although the denitrification activity of the catalyst after regeneration by this method has been improved to a certain extent, the recovery of the denitrification activity is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The test sample taken is arsenic poisoned Mn-Ce activated coke low-temperature denitrification catalyst, which is prepared by impregnation method. Arsenic content: 1.0wt%.

[0029] 1. Configure regeneration solution:

[0030] The cleaning solution contains nitric acid, strong acid-resistant penetrant OE-35 and deionized water; the active replenishing solution is composed of manganese nitrate, cerium nitrate hexahydrate and water;

[0031] in:

[0032] (1) cleaning solution. 20wt%HNO 3 , 0.5wt% acid-resistant penetrating agent OE-35.

[0033] (2) Active replenishment fluid. 0.5mol / L manganese nitrate, 0.5mol / L cerium nitrate hexahydrate

[0034] 2. Catalyst regeneration method:

[0035] (1) Put the arsenic-poisoned carbon-based catalyst in the cleaning solution for ultrasonic cleaning for 10 minutes, and then put it in a water bath for 20 minutes at a constant temperature, accompanied by continuous stirring, and the temperature was kept at 70 °C.

[0036] (2) Use...

Embodiment 2

[0041] The test sample taken is arsenic poisoned Mn-Ce activated coke low-temperature denitrification catalyst, which is prepared by impregnation method. Arsenic content: 1.0wt%.

[0042] 1. Configure regeneration solution:

[0043] The cleaning solution contains nitric acid, strong acid-resistant penetrant OE-35 and deionized water; the active replenishing solution is composed of manganese nitrate, cerium nitrate hexahydrate and water;

[0044] in:

[0045] (1) cleaning solution. 40wt%HNO 3 , 0.5wt% acid-resistant penetrating agent OE-35.

[0046] (2) Active replenishment fluid. 1.0mol / L manganese nitrate, 1.0mol / L cerium nitrate hexahydrate

[0047] 2. Catalyst regeneration method:

[0048] (1) Put the arsenic-poisoned carbon-based catalyst in the cleaning solution for ultrasonic cleaning for 10 min, and then put it in a water bath for 30 min at a constant temperature, accompanied by continuous stirring, and the temperature was kept at 80 °C.

[0049] (2) Use deioniz...

Embodiment 3

[0054] The test sample taken is arsenic poisoning Mn-Ce activated coke low-temperature denitrification catalyst, which is prepared by impregnation method. Arsenic content: 1.0wt%.

[0055] 1. Configure regeneration solution:

[0056] The cleaning solution contains nitric acid, strong acid-resistant penetrant OE-35 and deionized water; the active replenishing solution is composed of manganese nitrate, cerium nitrate hexahydrate and water;

[0057] in:

[0058] (1) cleaning solution. 40wt%HNO 3 , 0.5wt% acid-resistant penetrating agent OE-35.

[0059] (2) Active replenishment fluid. 1.0mol / L manganese nitrate, 1.0mol / L cerium nitrate hexahydrate.

[0060] 2. Catalyst regeneration method:

[0061] (1) Put the arsenic-poisoned carbon-based catalyst in the cleaning solution for ultrasonic cleaning for 10 minutes, and then put it in a water bath for 40 minutes at a constant temperature, accompanied by continuous stirring, and the temperature was kept at 90 °C.

[0062] (2) U...

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PUM

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Abstract

The invention aims to provide a high-efficiency arsenic poisoning carbon-based low-temperature denitration catalyst regeneration method, wherein a regeneration liquid comprises a cleaning liquid and an active supplementing liquid, the cleaning liquid contains nitric acid, a strong acid resistant penetrating agent OE-35 and deionized water, and the active supplementing liquid is prepared from manganese nitrate, cerium nitrate hexahydrate and water. According to the method, arsenic deposited on the surface of q catalyst can be effectively removed, the adopted regeneration liquid is easy to obtain and easy to prepare, the removal rate reaches 99.4% or above, and the denitration rate of the regenerated catalyst is recovered to a level close to that of the fresh catalyst.

Description

technical field [0001] The invention relates to the field of environmental protection technology and catalysts, in particular to a regeneration method for arsenic poisoning using a Mn-Ce carbon-based catalyst. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, which brings great harm to the ecological environment and human life and production. With the rapid development of the iron and steel industry, the NO emitted by iron and steel enterprises x The total amount ranks second in stationary source emissions, second only to coal-fired power plants, and NO in sintering flue gas x Emissions account for more than 50% of iron and steel enterprises. In June 2017, the Ministry of Environmental Protection issued the revised standard of "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standards", which included NO x The emission limit by 300mg / Nm 3 Upgraded to 100mg / Nm 3 , resulting in most of my country's iron and steel ent...

Claims

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Application Information

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IPC IPC(8): B01J23/92B01J38/02B01J38/48B01J38/60B01D53/86B01D53/56
CPCB01J23/92B01J38/60B01J38/48B01J38/485B01J38/02B01D53/8628B01D2258/0283
Inventor 任山苏增辉刘维燥阳杰周雨晗陈志超高宇翔张川王亮王宗宪
Owner CHONGQING UNIV
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