Regeneration method of MnOx/TiO2 based low-temperature denitration catalyst

Abstract

The invention discloses a regeneration method of a MnOx / TiO2 based low-temperature denitration catalyst. The regeneration method includes the following steps that high-pressure air is used for purging a catalyst monomer, then the catalyst is impregnated in deionized water under the action of ultrasonic waves to remove impurities and soluble substances, drying is performed, and then the obtained catalyst is put in an activation solution for activation treatment and then is sequentially subjected to microwave drying, calcination in a muffle furnace and ultraviolet irradiation treatment to obtain the regenerated SCR denitration catalyst. By means of the regeneration method, the regeneration problem of the deactivated MnOx / TiO2 based low-temperature denitration catalyst is solved, the MnOx / TiO2 based low-temperature denitration catalyst is applicable to catalysts deactivated to different degrees, and the denitration activity of the obtained regenerated denitration catalyst can be up to 97%. The using amount of the activation solution can be saved. Mn-Ti catalyst sol prepared by adopting a sol-gel method enables active components to be supported firmly, and the denitration effect is improved. In addition, the activity and poisoning resistance capacity of the regenerated catalyst can be improved by adopting the ultraviolet radiation treatment.

Description

technical field

[0001] The invention belongs to the technical field of deactivated catalyst regeneration, in particular to a MnO x / TiO 2 A regeneration method for a low-temperature denitrification catalyst. Background technique

[0002] Nitrogen oxides (NO x ) is one of the main air pollutants, which seriously endangers the production and life of human beings and causes huge pollution to the ecological environment, which mainly includes damage to plants and poisonous effects on the human body, as well as the formation of photochemical smog, acid rain and destruction of the ozone layer. It is a major problem in air pollution control.

[0003] Now many domestic and foreign power plants adopt selective catalytic reduction (SCR) denitrification technology to meet the increasingly stringent nitrogen oxide emission standards. V-W(Mo)-Ti series catalysts are the most widely used denitrification catalysts in the industry, and they have high denitrification activity in the tempe...

Examples

Embodiment 1

[0034] A kind of MnO x / TiO 2 A regeneration method for a low-temperature denitration catalyst based on deactivated MnO with a denitration rate of 37% x / TiO 2 Based low-temperature denitration catalyst, specifically comprising the following steps:

[0035] 1) Deactivate MnO by purging with dry compressed air x / TiO 2 Based on low-temperature denitrification catalyst, the pressure of compressed air is 1KPa, and the purging time is 70min; then under the condition of 500W ultrasonic vibration, the deactivated MnO x / TiO 2 The low-temperature denitrification catalyst was immersed in deionized water for 120 minutes to remove other impurities and soluble substances on the surface of the catalyst, and then dried;

[0036] 2) The deactivated MnO treated in step 1) x / TiO 2 Immerse the base-based low-temperature denitration catalyst into the activation solution (active sol of the Mn-Ti component) for activation treatment, and the immersion activation treatment time is 10 hours...

Embodiment 2

[0043] A kind of MnO x / TiO 2 A regeneration method based on low-temperature denitrification catalyst, aiming at deactivated MnO with a denitrification rate of 42% x / TiO 2 Based low-temperature denitration catalyst, specifically comprising the following steps:

[0044] 1) Deactivate MnO by purging with dry compressed air x / TiO 2 Based on low-temperature denitrification catalyst, the pressure of compressed air is 2KPa, and the purging time is 60min; then under the condition of 400W ultrasonic vibration, the deactivated MnO x / TiO 2 The base low-temperature denitrification catalyst was immersed in deionized water for 90 minutes to remove other impurities and soluble substances on the surface of the catalyst, and then dried;

[0045] 2) The deactivated MnO treated in step 1) x / TiO 2 Immerse the base-based low-temperature denitrification catalyst into the activation solution (active sol of Mn-Ti component) for activation treatment, and the immersion activation treatment...

Embodiment 3

[0052] A kind of MnO x / TiO 2 A regeneration method for a low-temperature denitrification catalyst based on deactivated MnO with a denitrification rate of 49% x / TiO 2 Based low-temperature denitration catalyst, specifically comprising the following steps:

[0053] 1) Deactivate MnO by purging with dry compressed air x / TiO 2 Based on low-temperature denitrification catalyst, the pressure of compressed air is 3KPa, and the purging time is 40min; then under the condition of 300W ultrasonic vibration, the deactivated MnO x / TiO 2 The base low-temperature denitrification catalyst was immersed in deionized water for 180 minutes to remove other impurities and soluble substances on the surface of the catalyst, and then dried;

[0054] 2) The deactivated MnO treated in step 1) x / TiO 2 Immerse the base-based low-temperature denitrification catalyst into the activation solution (active sol of Mn-Ti component) for activation treatment, and the soaking and activation treatment t...

technical field

[0001] The invention belongs to the technical field of deactivated catalyst regeneration, in particular to a MnO x / TiO 2 A regeneration method for a low-temperature denitrification catalyst. Background technique

[0002] Nitrogen oxides (NO x ) is one of the main air pollutants, which seriously endangers the production and life of human beings and causes huge pollution to the ecological environment, which mainly includes damage to plants and poisonous effects on the human body, as well as the formation of photochemical smog, acid rain and destruction of the ozone layer. It is a major problem in air pollution control.

[0003] Now many domestic and foreign power plants adopt selective catalytic reduction (SCR) denitrification technology to meet the increasingly stringent nitrogen oxide emission standards. V-W(Mo)-Ti series catalysts are the most widely used denitrification catalysts in the industry, and they have high denitrification activity in the tempe...

Examples

Embodiment 1

[0034] A kind of MnO x / TiO 2 A regeneration method for a low-temperature denitration catalyst based on deactivated MnO with a denitration rate of 37% x / TiO 2 Based low-temperature denitration catalyst, specifically comprising the following steps:

[0035] 1) Deactivate MnO by purging with dry compressed air x / TiO 2 Based on low-temperature denitrification catalyst, the pressure of compressed air is 1KPa, and the purging time is 70min; then under the condition of 500W ultrasonic vibration, the deactivated MnO x / TiO 2 The low-temperature denitrification catalyst was immersed in deionized water for 120 minutes to remove other impurities and soluble substances on the surface of the catalyst, and then dried;

[0036] 2) The deactivated MnO treated in step 1) x / TiO 2 Immerse the base-based low-temperature denitration catalyst into the activation solution (active sol of the Mn-Ti component) for activation treatment, and the immersion activation treatment time is 10 hours...

Embodiment 2

[0043] A kind of MnO x / TiO 2 A regeneration method based on low-temperature denitrification catalyst, aiming at deactivated MnO with a denitrification rate of 42% x / TiO 2 Based low-temperature denitration catalyst, specifically comprising the following steps:

[0044] 1) Deactivate MnO by purging with dry compressed air x / TiO 2 Based on low-temperature denitrification catalyst, the pressure of compressed air is 2KPa, and the purging time is 60min; then under the condition of 400W ultrasonic vibration, the deactivated MnO x / TiO 2 The base low-temperature denitrification catalyst was immersed in deionized water for 90 minutes to remove other impurities and soluble substances on the surface of the catalyst, and then dried;

[0045] 2) The deactivated MnO treated in step 1) x / TiO 2 Immerse the base-based low-temperature denitrification catalyst into the activation solution (active sol of Mn-Ti component) for activation treatment, and the immersion activation treatment...

Embodiment 3

[0052] A kind of MnO x / TiO 2 A regeneration method for a low-temperature denitrification catalyst based on deactivated MnO with a denitrification rate of 49% x / TiO 2 Based low-temperature denitration catalyst, specifically comprising the following steps:

[0053] 1) Deactivate MnO by purging with dry compressed air x / TiO 2 Based on low-temperature denitrification catalyst, the pressure of compressed air is 3KPa, and the purging time is 40min; then under the condition of 300W ultrasonic vibration, the deactivated MnO x / TiO 2 The base low-temperature denitrification catalyst was immersed in deionized water for 180 minutes to remove other impurities and soluble substances on the surface of the catalyst, and then dried;

[0054] 2) The deactivated MnO treated in step 1) x / TiO 2 Immerse the base-based low-temperature denitrification catalyst into the activation solution (active sol of Mn-Ti component) for activation treatment, and the soaking and activation treatment t...

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