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CN-121513904-B - Carbon monoxide catalyst capable of in-situ regeneration, preparation method and application

CN121513904BCN 121513904 BCN121513904 BCN 121513904BCN-121513904-B

Abstract

The invention relates to the technical field of catalysts, in particular to a carbon monoxide catalyst capable of being regenerated in situ, a preparation method and application thereof. The catalyst is prepared by the method. The method comprises the steps of uniformly mixing the prepared carbon deposit repairing powder and the prepared active catalytic powder according to a mass ratio of 1:1-2 to obtain composite powder, uniformly mixing the composite powder, a colloid solution and water according to a mass ratio of 20:3-5:25-40 to obtain slurry with a solid content of 30% -45%, coating the slurry on a carrier, and sequentially carrying out third drying treatment and third roasting treatment to obtain the carbon monoxide catalyst capable of being regenerated in situ. The application comprises the application of the catalyst in the aspect of catalyzing and oxidizing carbon monoxide and the application of the catalyst in the aspect of regenerating after carbon deposition. The catalyst prepared by the invention not only can catalyze and oxidize carbon monoxide into carbon dioxide, but also has a carbon deposit repairing function and an in-situ regeneration function at 330-350 ℃.

Inventors

  • CAI PENGPENG
  • LI HAITAO
  • Tang Caihe
  • PAN YUKUN
  • HAN YAOQING
  • CHENG HAIFENG
  • CAI JIE

Assignees

  • 湖南立泰环境科技有限公司
  • 岳阳兴长石化股份有限公司

Dates

Publication Date
20260512
Application Date
20260116

Claims (10)

  1. 1. A method for preparing an in situ regenerable carbon monoxide catalyst comprising: Step S1, uniformly mixing the prepared carbon deposit repair powder and the prepared active catalytic powder according to a mass ratio of 1:1-2 to obtain composite powder; Adding copper salt and nickel salt into water according to the mol ratio of Cu to Ni of 1:1-3 for dissolution, then adding TiO 2 powder, and stirring for dissolution to obtain carbon deposit repair liquid; Sequentially carrying out first drying treatment and first roasting treatment on the carbon deposit repairing liquid to obtain the carbon deposit repairing powder; the first roasting treatment adopts a roasting atmosphere which comprises 10-15% of water vapor and 85-90% of air, and the volume airspeed of the roasting atmosphere is 10000-15000 h -1 ; the active ingredient in the active catalytic powder comprises Pd; Step S2, uniformly mixing the composite powder, the colloid solution and water according to the mass ratio of 20:3-5:25-40 to obtain slurry with the solid content of 30% -45%, coating the slurry on a carrier, and sequentially carrying out third drying treatment and third roasting treatment to obtain the carbon monoxide catalyst capable of being regenerated in situ; the temperature adopted in the third roasting treatment is 300 ℃, and the roasting time is 1-2 h.
  2. 2. The method for preparing an in-situ regenerable carbon monoxide catalyst as claimed in claim 1, wherein the amount of water in said carbon deposit repair liquid is 8 to 10 times the total mass of said copper salt and said nickel salt; the dosage of TiO 2 powder in the carbon deposit repairing liquid is 8-10 times of the total mass of the copper salt and the nickel salt; The copper salt comprises copper nitrate; The nickel salt comprises nickel nitrate.
  3. 3. The method for preparing an in-situ regenerable carbon monoxide catalyst as claimed in claim 1, wherein the first drying treatment is carried out at a drying temperature of 80-120 ℃ for 4-6 hours; the temperature adopted in the first roasting treatment is 450-500 ℃, and the roasting time is 8-10 h.
  4. 4. The method for preparing the carbon monoxide catalyst capable of in-situ regeneration according to claim 1, wherein the preparation step of the active catalytic powder comprises the steps of uniformly mixing and dissolving palladium salt solution and TiO 2 powder according to a mass ratio of 25-35:100 to obtain an active catalytic liquid; Sequentially carrying out second drying treatment and second roasting treatment on the active catalytic liquid to obtain the active catalytic powder; The mass fraction of the palladium salt solution is 1%; The palladium salt solution includes a palladium nitrate solution.
  5. 5. The method for preparing an in-situ regenerable carbon monoxide catalyst as claimed in claim 4, wherein the second drying treatment is carried out at a drying temperature of 80-120 ℃ for 4-6 hours; the temperature adopted in the second roasting treatment is 450-500 ℃, and the roasting time is 6-8 hours.
  6. 6. The method for preparing an in situ regenerable carbon monoxide catalyst as recited in claim 1, wherein said colloidal solution comprises a silica sol having a SiO 2 content of 30%; In the carbon monoxide catalyst capable of in-situ regeneration, the dry loading capacity of the slurry on the carrier is 25% -30%; the support comprises a cordierite support.
  7. 7. The method for preparing an in-situ regenerable carbon monoxide catalyst as recited in claim 1, wherein said third drying treatment is carried out at a drying temperature of 80-120 ℃ for a drying time of 4-6 hours.
  8. 8. An in situ regenerable carbon monoxide catalyst prepared by the method of any one of claims 1 to 7.
  9. 9. The use of an in-situ regenerable carbon monoxide catalyst as claimed in claim 8 for the catalytic oxidation of carbon monoxide at a catalytic oxidation temperature of 270 to 300 ℃.
  10. 10. The use of an in-situ regenerable carbon monoxide catalyst as claimed in claim 8, wherein the regeneration temperature is 330 to 350 ℃ and the regeneration time is 3 to 24 hours.

Description

Carbon monoxide catalyst capable of in-situ regeneration, preparation method and application Technical Field The invention relates to the technical field of catalysts, in particular to a carbon monoxide catalyst capable of being regenerated in situ, a preparation method and application thereof. Background Industrial flue gas is an important source of carbon monoxide emissions. The sintering flue gas emission in the steel smelting industry is large (the flue gas flow is 50-200 Nm 3/h), the pollutant composition is complex (various pollutants such as SO 2、NOx, CO and organic waste gas VOCs are contained), the pollutant content is high, and the air quality of the region where a steel mill is located is seriously influenced. At present, carbon monoxide in sintering flue gas of iron and steel enterprises is basically removed by a catalytic oxidation method, specifically, under the action of a catalyst, the carbon monoxide in the sintering flue gas is oxidized into carbon dioxide by oxygen, so that the treatment purpose is achieved. In order to meet the SCR denitration working condition and reduce energy waste, the CO catalytic oxidation operation temperature is usually 280 ℃. However, the catalyst is susceptible to deactivation due to the complexity of the sintering flue gas and the fluctuation of the actual conditions. Studies have shown that noble metal catalysts for the catalytic oxidation of carbon monoxide in sintering flue gas deactivate for essentially soot deactivation. The carbon deposition is mostly caused by incomplete oxidation after the adsorption of organic waste gas VOCs such as hydrocarbons in the sintering flue gas on the surface of the catalyst, and the carbon deposition is slowly accumulated on the surface of the catalyst to cause the deactivation of the catalyst. Aiming at the problem of deactivation of carbon deposition on the catalyst, researchers avoid carbon deposition by developing a high-activity formula or increasing the content of noble metals, improving the activity of the catalyst and reducing the occurrence of incomplete oxidation. However, in industrial applications, there are unavoidable conditions of temperature, flue gas concentration, and flue gas amount fluctuation (such as during a start-up period or other abnormal conditions), and when the temperature is lower than a design value, the flue gas concentration is too high, or the flue gas amount is large, carbon deposition still occurs due to exceeding the catalyst treatment load. Over time, excessive carbon build-up can still result in deactivation of the catalyst. Once the catalyst is formed, it is required to be at 450 ℃ or higher, and the carbon deposit can be removed by baking in an air atmosphere for a long time. The method for removing the carbon deposit by high-temperature roasting has two defects that the catalyst is easy to be sintered and deactivated at high temperature due to overhigh temperature, and the catalyst with the carbon deposit is required to be removed from the reactor before roasting, and the catalyst is roasted at high temperature in a special roasting furnace, so that time and labor are wasted, and the cost is increased. Therefore, it is necessary to provide a carbon monoxide catalyst capable of in-situ regeneration, a preparation method and application thereof to solve the problem that the catalyst is deactivated due to carbon deposition, and solve the problems that the existing method for removing the carbon deposition of the catalyst by high-temperature roasting easily causes the catalyst to be deactivated by high-temperature sintering, and a special roasting furnace is needed to cause time and labor waste and increase cost. Disclosure of Invention The invention aims to provide a carbon monoxide catalyst capable of in-situ regeneration, a preparation method and application thereof, and the specific technical scheme is as follows: In a first aspect, the present invention provides a method for preparing an in situ regenerable carbon monoxide catalyst comprising: Step S1, uniformly mixing the prepared carbon deposit repair powder and the prepared active catalytic powder according to a mass ratio of 1:1-2 to obtain composite powder; Adding copper salt and nickel salt into water according to the mol ratio of Cu to Ni of 1:1-3 for dissolution, then adding TiO 2 powder, and stirring for dissolution to obtain carbon deposit repair liquid; Sequentially carrying out first drying treatment and first roasting treatment on the carbon deposit repairing liquid to obtain the carbon deposit repairing powder; the first roasting treatment adopts a roasting atmosphere which comprises 10-15% of water vapor and 85-90% of air, and the volume airspeed of the roasting atmosphere is 10000-15000 h -1; the active ingredient in the active catalytic powder comprises Pd; and S2, uniformly mixing the composite powder, the colloid solution and water according to the mass ratio of 20:3-5:25-40 to obtain slurry with the solid conten