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CN-122006701-A - Novel ultra-high specific surface area high-efficiency ozone decomposition catalyst and coating process thereof

CN122006701ACN 122006701 ACN122006701 ACN 122006701ACN-122006701-A

Abstract

The invention discloses a novel ultra-high specific surface area high-efficiency ozone decomposition catalyst and a coating process thereof, relates to the technical field of ozone decomposition, and aims to solve the problem of low ozone decomposition efficiency in the prior art. The catalyst is in the form of suspension, and is prepared by adopting the steps of A1, synthesizing nano manganese dioxide with a nanowire, a nano sheet or an ultrathin nano flower structure by adopting a hydrothermal method or a coprecipitation method, A2, freeze-drying the synthesized nano manganese dioxide to obtain black nano manganese dioxide powder, A3, mixing the nano manganese dioxide powder with deionized water, a binder, a thickening agent and a dispersing agent, and grinding for 12-24 hours by adopting a ball mill or a sand mill to form the stable and uniform catalyst in the form of suspension. The invention has the advantage of realizing efficient ozonolysis.

Inventors

  • ZHAO YINGBIN

Assignees

  • 极光离子科技(武汉)有限责任公司

Dates

Publication Date
20260512
Application Date
20260311

Claims (10)

  1. 1. A novel high-efficiency ozone decomposition catalyst with ultra-high specific surface area is characterized in that the catalyst is in a suspension form and is prepared by the following steps of; a1, synthesizing nano manganese dioxide with a nanowire, a nano sheet or an ultrathin nano flower structure by adopting a hydrothermal method or a coprecipitation method; A2, freeze-drying the synthesized nano manganese dioxide to obtain black nano manganese dioxide powder; A3, mixing the nano manganese dioxide powder with deionized water, a binder, a thickener and a dispersing agent, and grinding for 12-24 hours by adopting a ball mill or a sand mill to form a stable and uniform catalyst in the form of suspension.
  2. 2. The novel ultra-high specific surface area high-efficiency ozone decomposition catalyst according to claim 1, wherein in the above A3, the binder is one of pseudo-boehmite or silica sol, the thickener is sodium carboxymethyl cellulose, and the dispersant is polyethylene glycol.
  3. 3. The novel ultra-high specific surface area high-efficiency ozone decomposition catalyst according to claim 1, wherein in the A3, 15% -30% of nano manganese dioxide powder, 40% -60% of deionized water, 10% -20% of a binder, 0.5% -2% of a thickener and 1% -5% of a dispersant are mixed in sequence.
  4. 4. A novel ultra-high specific surface area high efficiency ozone decomposition catalyst coating process, which is applicable to the novel ultra-high specific surface area high efficiency ozone decomposition catalyst as set forth in any one of the preceding claims 1-3, characterized in that the coating process comprises the steps of; b1, selecting cordierite to prepare a cordierite honeycomb carrier, then immersing the cordierite honeycomb carrier into the catalyst in the suspension form completely, and taking out after waiting for 8-15 minutes; B2, purging all pore channels of the cordierite honeycomb carrier by adopting high-speed airflow, so that redundant catalyst in the pore channels of the cordierite honeycomb carrier is removed, the pore channel walls are ensured to be covered with only one layer of thin and uniform catalyst, and all the pore channels are kept smooth; B3, repeating the steps B1 and B2 until the catalyst loading capacity of the inner walls of all pore channels of the cordierite honeycomb carrier reaches 8-13mg/cm < 2 >; And B4, drying the catalyst on the cordierite honeycomb carrier in the shade at room temperature, drying the catalyst on the cordierite honeycomb carrier at 80-100 ℃, and finally roasting for 2-4 hours.
  5. 5. The process of claim 4, wherein in B1, the prepared cordierite honeycomb carrier is cleaned to remove surface impurities, and one of acid washing and ultrasonic cleaning is performed to clean the cordierite honeycomb carrier.
  6. 6. The coating process of the novel ultra-high specific surface area high-efficiency ozone decomposition catalyst according to claim 5, which is characterized in that, further comprising roughening the cleaned cordierite honeycomb carrier to increase its surface roughness, providing more anchor points for subsequent coating.
  7. 7. The process for coating a novel ultra-high specific surface area high efficiency ozone decomposition catalyst according to claim 4, wherein said cordierite honeycomb carrier is one of rectangular or cylindrical having a honeycomb structure.
  8. 8. The process for coating a novel ultra-high specific surface area high efficiency ozone decomposition catalyst according to claim 6, wherein the roughening treatment is a pre-coating of gamma-Al 2 O 3 on the surface of the cordierite honeycomb carrier and inside each pore canal.
  9. 9. The process for coating a novel ultra-high specific surface area high-efficiency ozonolysis catalyst according to claim 4, characterized in that in the step B4, the step B is performed by heating up in a sectional manner and adding inert gas protection, the temperature is raised from room temperature to 150 ℃ at a rate of 5 ℃ per minute and kept for 1 hour, the temperature is raised to 300-450 ℃ at a rate of 10 ℃ per minute and the baking is performed for 2-4 hours, and meanwhile, nitrogen is introduced as a shielding gas.
  10. 10. The process for coating a novel ultra-high specific surface area high efficiency ozone decomposing catalyst as claimed in claim 4, wherein in said step B1, the temperature of the catalyst is maintained at 25 to 30 ℃ when the cordierite honeycomb carrier is completely immersed in the catalyst.

Description

Novel ultra-high specific surface area high-efficiency ozone decomposition catalyst and coating process thereof Technical Field The invention relates to the technical field of ozonolysis, in particular to a novel high-efficiency ozonolysis catalyst with ultrahigh specific surface area and a coating process thereof. Background Ozone is used as a strong oxidizing gas and is widely applied to the fields of disinfection, water treatment, air purification and the like, but excessive ozone can cause harm to human respiratory tracts and nervous systems and can accelerate material aging, so that the ozonolysis purification technology becomes one of the key requirements in the field of environmental protection. Currently, the ozone decomposition means commonly used in industry is mainly a catalytic decomposition method, and the core is the suitability of the ozone decomposition catalyst for the coating process. The existing ozonolysis catalyst mostly uses manganese dioxide as an active component, but the traditional manganese dioxide is mostly in a block or low specific surface area particle structure, and is often prepared into a fixed bed particle catalyst or a coating catalyst, the specific surface area of the active component is limited, so that the contact of ozone and the active site of the catalyst is insufficient, and the decomposition efficiency is low. In view of the above, we propose a novel ultra-high specific surface area high efficiency ozone decomposition catalyst and a coating process thereof. Disclosure of Invention The invention aims to provide a novel high-efficiency ozone decomposition catalyst with ultrahigh specific surface area and a coating process thereof, and aims to solve the problem of low ozone decomposition efficiency in the prior art. In order to solve the technical problems, the invention provides the technical scheme that the novel ultra-high specific surface area high-efficiency ozone decomposition catalyst is in the form of suspension, and is prepared by the following steps; a1, synthesizing nano manganese dioxide with a nanowire, a nano sheet or an ultrathin nano flower structure by adopting a hydrothermal method or a coprecipitation method; A2, freeze-drying the synthesized nano manganese dioxide to obtain black nano manganese dioxide powder; A3, mixing the nano manganese dioxide powder with deionized water, a binder, a thickener and a dispersing agent, and grinding for 12-24 hours by adopting a ball mill or a sand mill to form a stable and uniform catalyst in the form of suspension. Preferably, in the above A3, the binder is one of pseudo-boehmite or silica sol, the thickener is sodium carboxymethyl cellulose, and the dispersant is polyethylene glycol. Preferably, in the A3, the nano manganese dioxide powder is mixed with deionized water, a binder, a thickener and a dispersing agent according to the mass percentage of 15% -30%, 40% -60%, 10% -20%, 0.5% -2% and 1% -5%. The invention also discloses a novel coating process of the ultra-high specific surface area high-efficiency ozonolysis catalyst, which comprises the following steps of; b1, selecting cordierite to prepare a cordierite honeycomb carrier, then immersing the cordierite honeycomb carrier into the catalyst in the suspension form completely, and taking out after waiting for 8-15 minutes; B2, purging all pore channels of the cordierite honeycomb carrier by adopting high-speed airflow, so that redundant catalyst in the pore channels of the cordierite honeycomb carrier is removed, the pore channel walls are ensured to be covered with only one layer of thin and uniform catalyst, and all the pore channels are kept smooth; B3, repeating the steps B1 and B2 until the catalyst loading capacity of the inner walls of all pore channels of the cordierite honeycomb carrier reaches 8-13mg/cm < 2 >; And B4, drying the catalyst on the cordierite honeycomb carrier in the shade at room temperature, drying the catalyst on the cordierite honeycomb carrier at 80-100 ℃, and finally roasting for 2-4 hours. Preferably, in the above step B1, cleaning the prepared cordierite honeycomb carrier to remove surface impurities is further included, and one of acid washing and ultrasonic cleaning is used for cleaning the cordierite honeycomb carrier. Preferably, the method further comprises roughening the cleaned cordierite honeycomb carrier to increase its surface roughness and provide more anchor points for subsequent coating. Preferably, the cordierite honeycomb carrier is one of rectangular or cylindrical having a honeycomb structure. Preferably, the roughening treatment is to pre-coat a layer of gamma-Al 2O3 on the surface of the cordierite honeycomb carrier and inside each pore canal. Preferably, in the step B4, the roasting is performed by adopting the sectional heating and the protection of inert gas, firstly, the temperature is raised to 150 ℃ from room temperature at the speed of 5 ℃ per minute, the temperature is kept for 1 hour, then the tem