Regeneration technology of denitration catalyst

A denitration catalyst and process technology, applied in the field of denitration catalyst regeneration technology, can solve the problems of inability to accurately control the amount of active substances, unstable denitration efficiency, increase production cost, etc., and achieve the effects of strong acting force, inhibition of sintering, and uniform distribution

Inactive Publication Date: 2018-05-11
JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above uses the general impregnation method for active supplementation. In actual mass production, the amount of active substances cannot be precisely controlled, resulting in unstable denitrification efficiency and SO 2 High oxidation and high temperature calcination increase production cost and damage the catalyst during the regeneration process

Method used

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  • Regeneration technology of denitration catalyst

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Experimental program
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Effect test

Embodiment 1

[0015] The regeneration process of the denitration catalyst includes the following specific steps:

[0016] 1) Pretreatment of the deactivated denitrification catalyst: remove the dust on the surface of the deactivated denitrification catalyst by a negative pressure vacuum cleaner, then immerse the catalyst in a deionized aqueous solution containing 0.05% lactic acid and 0.10% oxalic acid, ultrasonicate at 20HZ for 30min, take it out and store it at 120°C Dry for 90min;

[0017] 2) Implantation of active substances by atomic layer deposition method: put the catalyst treated in step 1) into the reaction chamber of the atomic layer deposition equipment, and seal the reaction chamber; vacuumize the atomic layer deposition system and introduce high-purity nitrogen gas to adjust The outlet valve of the reaction chamber makes the pressure in the chamber negative, and the deposition temperature is set at 300°C; inject the mixed precursor of vanadium oxide triisopropoxide and tungsten...

Embodiment 2

[0019] The regeneration process of the denitration catalyst includes the following specific steps:

[0020] 1) Pretreatment of the deactivated denitrification catalyst: remove the dust on the surface of the deactivated denitrification catalyst by a negative pressure vacuum cleaner, then immerse the catalyst in a deionized aqueous solution containing 0.1% lactic acid and 0.20% oxalic acid, ultrasonicate at 40HZ for 60min, take it out and store it at 150°C Dry for 30min;

[0021] 2) Implantation of active substances by atomic layer deposition method: put the catalyst treated in step 1) into the reaction chamber of the atomic layer deposition equipment, and seal the reaction chamber; vacuumize the atomic layer deposition system and introduce high-purity nitrogen gas to adjust The outlet valve of the reaction chamber keeps the pressure in the chamber at negative pressure, and the deposition temperature is set at 400°C; the mixed precursor of vanadium triisopropoxide and tungsten e...

Embodiment 3

[0023] The regeneration process of the denitration catalyst includes the following specific steps:

[0024] 1) Pretreatment of the deactivated denitrification catalyst: remove the dust on the surface of the deactivated denitrification catalyst with a negative pressure vacuum cleaner, then immerse the catalyst in a deionized aqueous solution containing 0.08% lactic acid and 0.15% oxalic acid, ultrasonicate at 28HZ for 45min, take it out and store it at 140°C Dry for 60min;

[0025] 2) Implantation of active substances by atomic layer deposition method: put the catalyst treated in step 1) into the reaction chamber of the atomic layer deposition equipment, and seal the reaction chamber; vacuumize the atomic layer deposition system and introduce high-purity nitrogen gas to adjust The outlet valve of the reaction chamber makes the pressure in the chamber negative, and the deposition temperature is set at 350°C; the mixed precursor of vanadium oxide acetylacetonate and tungsten dich...

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Abstract

The invention discloses a regeneration technology of a denitration catalyst. The regeneration technology comprises steps as follows: 1), an inactivated denitration catalyst is pretreated; 2), active substances including vanadium oxide and tungsten oxide are implanted to the inactivated denitration catalyst with an atomic layer deposition method, and a regenerated denitration catalyst is obtained,wherein vanadium oxide accounts for 0.1%-0.5% by mass of the regenerated denitration catalyst and tungsten oxide accounts for 0.3%-1% by mass of the regenerated denitration catalyst. According to theregeneration technology of the denitration catalyst, the active substances are supplemented with the atomic layer deposition method and adsorbed inside and outside a catalyst pore channel, have strongacting force with the inactivated denitration catalyst and are distributed in the catalyst uniformly; the quantity of the supplemented active substances is regulated and controlled by controlling thenumber of atom deposition, and the implanted active substances including vanadium oxide and tungsten oxide are accurate and controllable.

Description

technical field [0001] The invention relates to the field of regeneration of denitration catalysts, in particular to a regeneration process of denitration catalysts. Background technique [0002] As an important part of the denitrification system of coal-fired power plants, the cost of denitrification catalyst accounts for nearly 40% of the total investment of denitrification projects. Therefore, by adopting regeneration measures of denitrification catalysts, improving the comprehensive utilization efficiency of denitrification catalysts has become a breakthrough to reduce the denitrification operating costs of coal-fired thermal power plants. [0003] Regeneration of denitrification catalyst is to analyze the cause of catalyst deactivation, adopt corresponding technological means to eliminate catalyst deactivation factors, restore activity and selectivity of deactivated denitrification catalyst, and reuse it. Chinese patent CN201210100560.5 immerses the cleaned catalyst in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/92B01J38/00B01J38/62B01J38/68
CPCB01J23/92B01J38/00B01J38/62B01J38/68
Inventor 张涛何伟陈春兴赖晓清
Owner JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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