Regeneration method of denitration catalyst

A denitration catalyst and catalyst technology, which are applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc., can solve the problems of reduced mechanical strength of catalysts, reduced denitration efficiency, etc., and achieve low cost, short working cycle, and increased specific surface area. Effect

Active Publication Date: 2015-07-29
青海省化工设计研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, after a period of operation of the denitrification catalyst used in industry, there are two problems: the denitrification efficiency decreases and the mechanical ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] For the denitrification catalyst running for 16000h, the negative pressure used in step (1) is 0.05MPa, and the ash on the surface of the catalyst is vacuumed and cleaned with a brush with a diameter of 3-5mm. Step (2) Use a cleaning solution to clean the catalyst surface and pores. The volume ratio of the cleaning solution to the catalyst volume is 7:1. The cleaning solution is composed of 0.5 mole NaOH, 1% penetrant JFC-S, and 0.5% emulsifier OP -10, 0.5% metal chelating agent HEDP, ultrasonic power of 6KW, frequency of 40HZ, cleaning temperature of 30°C, cleaning time of 30 minutes, and drying temperature of 90°C after cleaning. Step (3) impregnate the catalyst with a nitric acid solution containing 0.1 mole of 0.2% lanthanum nitrate, 0.05% cerium nitrate, and 2% aluminum dihydrogen phosphate. The impregnation temperature is 30°C, and the impregnation time is 3 hours. Calcined for 4 hours. Step (4) Use 2% oxalic acid solution to dissolve 0.5% ammonium metavanadate, ...

Embodiment 2

[0028] For the denitrification catalyst running for 18,000 hours, while repeating Example 1, the difference is that in step (2), the surface and pores of the catalyst are cleaned with an ultrasonic cleaning solution. The volume ratio of the cleaning solution to the catalyst volume is 7:1, and the cleaning solution consists of 0.5 mole NaOH, 1% penetrant JFC-S, 0.6% emulsifier OP-10, 0.6% metal chelating agent HEDP, ultrasonic power 6KW, frequency 40HZ, cleaning temperature 30 ℃, cleaning time 30 min, after drying. Step (3) impregnate the catalyst with a nitric acid solution containing 0.1 mole of 0.25% lanthanum nitrate, 0.06% cerium nitrate, and 2.5% aluminum dihydrogen phosphate. The impregnation temperature is 30°C, and the impregnation time is 3 hours. °C for 4 hours. Step (4) Use 2% oxalic acid solution to dissolve 0.6% ammonium metavanadate, 4% ammonium tungstate, 0.25% ammonium molybdate, and 0.06% niobium pentoxide solution. After immersing at 30°C for 3 hours, and t...

Embodiment 3

[0030] For the denitrification catalyst running for 20,000 hours, while repeating Example 2, the difference is that in step (2), the surface and pores of the catalyst are cleaned with a cleaning solution. The volume ratio of the cleaning solution to the catalyst volume is 7:1, and the cleaning solution is composed of 0.5 mole NaOH, 1.5% penetrant JFC-S, 0.7% emulsifier OP-10, 0.7% metal chelating agent HEDP, ultrasonic power 6KW, frequency 40HZ, cleaning temperature 30°C, cleaning time 30 min, post-baking Dry. Step (3) Use 0.1 mole nitric acid solution containing 0.30% lanthanum nitrate, 0.08% cerium nitrate, and 3% aluminum dihydrogen phosphate to impregnate the catalyst. The impregnation temperature is 30°C, and the impregnation time is 3 hours. °C for 4 hours. Step (4) Use 2.5% oxalic acid solution to dissolve 0.8% ammonium metavanadate, 4.5% ammonium tungstate, 0.30% ammonium molybdate, and 0.08% niobium pentoxide solution. 3 hours, immersion temperature 30 ℃, and then c...

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Abstract

The invention discloses a regeneration method of a denitration catalyst. The method is characterized by comprising the following steps: (1) carrying out negative pressure dust sucking on the surface and the pore canals of a deactivated denitration catalyst at the negative pressure of 0.05-0.07 MPa, while cleaning the pore canals of the catalyst with a fur brush; (2) using a prepared cleaning solution to clean the surface and the pore canals of the catalyst with ultrasonic wave and drying the catalyst; (3) steeping the catalyst in 0.1 mole of a prepared saltpeter solution containing rare earth elements La and Ce and aluminium dihydrogen phosphate and calcining the catalyst to increase the specific surface area of the catalyst and enhance the mechanical strength of the catalyst at the same time; (4) steeping the calcined catalyst in an active-ingredients steeping solution; (5) calcining. By implementing the method, the denitration efficiency of the catalyst after deactivated catalyst generation can reach 82%-87%, and the catalyst strength can be increased by 40%; the method is easy to operate and has prominent economic and social benefits.

Description

technical field [0001] The invention relates to a catalyst regeneration method, in particular to a method for recovering the activity and strength of a honeycomb denitration catalyst. Background technique [0002] The emission of nitrogen oxides (NOx) seriously affects the atmospheric environment and human health. Selective catalytic reduction (SCR) flue gas denitrification technology is one of the effective methods for removing NOx. In recent years, the research on regeneration of denitrification catalysts after running for a period of time has become a hot spot in the research of SCR denitrification catalysts. For example, a SCR flue gas denitrification catalyst regeneration method 201210100560.5P applied by Nanjing University of Technology. This invention uses the catalyst to be regenerated to be purged, and then the catalyst is put into the cleaning pool to be cleaned with cleaning liquid and dried; The catalyst is impregnated in the activity replenishing liquid, ...

Claims

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Application Information

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IPC IPC(8): B01D53/96B01D53/56
Inventor 刘海刚唐宏学王文侠兰小颖
Owner 青海省化工设计研究院有限公司
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