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CN-121971993-A - Peculiar smell catalytic decomposition coating and refrigerator peculiar smell removing module

CN121971993ACN 121971993 ACN121971993 ACN 121971993ACN-121971993-A

Abstract

A catalytic decomposition coating for peculiar smell is characterized by comprising a bottom layer, a middle layer and a surface layer, wherein the bottom layer takes CeO 2 -ZrO 2 solid solution as a carrier to load La-doped MnO 3 , the middle layer takes Al 2 O 3 as a carrier to load K 2 CO 3 and Ag nano particles, and the surface layer loads CuO and Fe 2 O 3 . The invention also discloses a refrigerator peculiar smell removing module. Three layers of composite catalysts are loaded on the surface of the inner wall of the ceramic block channel, and the service life can be effectively prolonged due to the design of the anti-poisoning catalyst gradient functional layer.

Inventors

  • YU HUI
  • HAN CHENYANG
  • ZHENG JUNMEI
  • HUO YANQIANG

Assignees

  • 宁波方太厨具有限公司

Dates

Publication Date
20260505
Application Date
20260108

Claims (15)

  1. 1. A catalytic decomposition coating for odor is characterized by comprising The bottom layer takes CeO 2 -ZrO 2 solid solution as a carrier to load La doped MnO 3 ; An intermediate layer carrying K 2 CO 3 and Ag nanoparticles on Al 2 O 3 , and The surface layer is loaded with CuO and Fe 2 O 3 .
  2. 2. The odor catalytic decomposition coating according to claim 1, wherein the underlayer satisfies the following conditions that the molar ratio of Ce to Zr is 4:1-6:1, the specific surface area is not less than 120m < 2 >/g, the active component is La doped MnO 3 , the La doping amount is 0.5-3 wt%, the MnO 3 crystal form is 85-90 wt% of alpha-MnO 2 ; CeO 2 -ZrO 2 solid solution carrier, and the La-MnO 3 is 10-15 wt%.
  3. 3. The odor catalytic converter coating of claim 1, wherein said intermediate layer satisfies the following conditions: The specific surface area of the carrier gamma-Al 2 O 3 is more than or equal to 200m < 2 >/g, the pore diameter is 5-10 nm, the K 2 CO 3 loading is 5-10 wt.%, the particle size is 100-200 nm, the Ag nanoparticle loading is 0.5-2 wt.%, the particle size is 20-50 nm, the weight ratio of the carrier Al 2 O 3 is 88-92 wt.%, the K 2 CO 3 is 5-10 wt.%, and the Ag is 0.5-2 wt.%.
  4. 4. The odor catalytic converter coating according to claim 1 or 2, characterized in that said surface layer satisfies the following conditions: the porosity of the FeCrAl alloy fiber is more than or equal to 40%, the fiber diameter is 10-20 mu m, the molar ratio of Cu to Fe is 3:1-1:1, the crystal form of CuO is a CuO nano rod, the crystal form of Fe 2 O 3 is Fe 2 O 3 nano particles, the FeCrAl carrier accounts for 75-80 wt%, the CuO accounts for 15-20 wt%, and the Fe 2 O 3 accounts for 5-10 wt%.
  5. 5. The odor catalytic converter coating according to claim 1 or 2, characterized in that said base layer is prepared by the steps of: Ce (NO 3 ) 3 ·6H 2 O) and ZrOCl 2 ·8H 2 O are mixed according to a proportion, the pH value is regulated to 9-10 by ammonia water, and CeO 2 -ZrO 2 sol is obtained by stirring; La (NO 3 ) 3 and Mn (NO 3 ) 2 are dissolved in proportion, ceO 2 -ZrO 2 sol is added, and the mixture is aged to obtain slurry; spraying the slurry to the inner wall of the ceramic block by adopting spraying equipment, wherein the thickness is 50-100 mu m; And (5) heat preservation after roasting.
  6. 6. A catalytic odour-decomposing coating according to claim 1 or 3, characterized in that the intermediate layer is prepared by the steps of: Hydrolyzing Al (NO 3 ) 3 ·9H 2 O) and urea according to a molar ratio of 1:2, and stirring; dissolving K 2 CO 3 in deionized water, adding AgNO 3 , and reducing sodium borohydride to generate Ag nano particles according to a molar ratio of 1:2; the dipping method is carried out until the surface of the bottom layer, the thickness is 30-50 mu m; And (5) roasting.
  7. 7. The odor catalytic converter coating according to claim 1 or 4, characterized in that said surface layer is prepared by the steps of: copper nitrate and ferric nitrate are mixed according to a proportion, CTAB template agent is added, and hydrothermal reaction is carried out; the mechanical mixing method comprises the steps of mixing CuO nano rods and FeCrAl fibers according to the proportion of CuO to Fe 2 O 3 to fibers=15:5:80, and ball milling; the tablet press is pressed into a tablet layer with the thickness of 100-150 mu m, attaching to the surface of the intermediate layer; And (5) roasting.
  8. 8. A refrigerator odor removal module having an odor catalytic decomposition coating according to any one of claims 1 to 7, characterized by comprising The shell (1) is provided with an air inlet end (14) and an air outlet end (13); The plasma catalysis cooperative assembly (2) is arranged in the shell (1) and comprises a first polar plate (21), a second polar plate (22) and a ceramic block (23), wherein the first polar plate (21) and the second polar plate (22) are arranged at intervals and are respectively provided with a vent hole, the first polar plate (21) is close to an air inlet end (14), the second polar plate (22) is coated with a photocatalytic coating capable of converting ozone into oxygen, and the ceramic block (23) is arranged between the first polar plate (21) and the second polar plate (22) and is provided with a through-flow channel (231), and the ceramic block is loaded with an odor catalytic decomposition coating; A plasma power supply (3) provided in the housing (1) and configured to supply power to the first electrode plate (21) and the second electrode plate (22); a fan (5) arranged in the shell (1), an air outlet arranged corresponding to an air outlet end (13) of the shell (1), an air inlet capable of receiving the air from the second pole plate, and An ultraviolet light source (6) provided in the housing (1) and close to the second plate (22).
  9. 9. The refrigerator deodorizing module according to claim 8, characterized in that the inner wall of the case (1) is provided with a reflecting mirror surface (7) capable of uniformly radiating the ultraviolet light emitted from the ultraviolet light source (6) onto the positive plate.
  10. 10. The odor removal module of refrigerator according to claim 9, wherein the outer side wall of the fan (5), the reflecting mirror (7) and the second polar plate (22) form a triangular area, and the ultraviolet light source (6) is disposed on a vertex angle where the outer side wall of the fan (5) and the second polar plate (22) intersect.
  11. 11. A refrigerator deodorizing module according to claim 10, characterized in that said fan (5) is a centrifugal fan.
  12. 12. The refrigerator odor removal module according to claim 11, wherein the housing (1) is rectangular, the blower (5) is disposed in the middle of the housing (1), the plasma catalytic cooperative assembly (2) is two and is obliquely disposed on two sides of the blower (5) to form a splayed shape, and the air inlet ends (14) of the housing (1) are at least two groups and respectively correspond to the respective second polar plates (22).
  13. 13. The refrigerator odor removal module of claim 8, wherein the first plate (21) is a negative plate, the second plate (22) is a positive plate, or the first plate (21) is a positive plate, and the second plate (22) is a negative plate.
  14. 14. The refrigerator odor removal module of claim 8, wherein the photocatalytic coating is a composite of TiO 2 and graphene.
  15. 15. The refrigerator odor removal module of claim 14, wherein the weight of graphene in the composite of TiO 2 and graphene relative to TiO 2 is 2%, and the particle size of TiO 2 is 5-10 nm.

Description

Peculiar smell catalytic decomposition coating and refrigerator peculiar smell removing module Technical Field The invention relates to a coating capable of removing peculiar smell, and also relates to an assembly capable of removing peculiar smell. Background Aiming at the problem of refrigerator peculiar smell decomposition, the prior art generally adopts a plasma catalysis cooperative technology, and the core structure of the refrigerator peculiar smell decomposition device comprises a plasma generation unit, a catalysis unit and an airflow channel. The plasma generation unit excites Dielectric Barrier Discharge (DBD) through two metal polar plates (respectively connected with positive and negative high voltages) which are arranged in parallel to generate active substances such as OH hydroxyl radicals, O oxygen radicals and the like to form a strong oxidation environment, the catalytic unit is a ceramic block with a composite catalyst loaded on the surface, peculiar smell molecules flowing through the surface of the catalytic unit are adsorbed and decomposed into harmless substances by utilizing the chemical adsorption characteristic of the catalyst, an air flow channel is designed in a zoning way, firstly, peculiar smell gas enters a plasma zone to finish preliminary oxidation pretreatment, then flows into the catalytic unit to be deeply decomposed, and finally low-concentration clean gas is discharged. In the prior art, H 2 S gas generated in a refrigerator is subjected to oxidation reaction on the surface of a catalyst to generate elemental sulfur, catalyst pore channels are easily blocked by physical embedding or chemical bonding, pollutants such as sulfides, grease and the like are easily adsorbed on the surface of the catalyst, active sites are blocked, NOx generated by plasma is combined with hydroxyl on the surface of the catalyst, the catalytic activity is reduced, and improvement is needed. In addition, when high voltage is applied between two parallel metal plates, a micro-discharge channel is formed in the gas gap, O 2 molecules are collided and dissociated into O-free radicals by high-energy electrons, and then the O-free radicals are combined with O 2 to generate O 3. The ozone exceeding the standard for a long time not only stimulates the respiratory tract of the human body, but also reacts with TVOC (Total Volatile Organic Compounds, namely total volatile organic compounds) to generate secondary pollutants such as aldehydes. Disclosure of Invention The first technical problem to be solved by the present invention is to provide a catalytic decomposition coating for removing surface contaminants in situ. The second technical problem to be solved by the present invention is to provide a refrigerator odor removal module capable of removing surface contaminants in situ. The invention solves the first technical problem that the invention adopts the technical proposal that the peculiar smell catalytic decomposition coating is characterized by comprising The bottom layer takes CeO 2-ZrO2 solid solution as a carrier to load La doped MnO 3; An intermediate layer carrying K 2CO3 and Ag nanoparticles on Al 2O3, and The surface layer is loaded with CuO and Fe 2O3. Preferably, the bottom layer meets the following conditions that the molar ratio of Ce to Zr is 4:1-6:1, the specific surface area is more than or equal to 120 m < 2 >/g, the active component is La doped MnO 3, the La doping amount is 0.5-3 wt%, the MnO 3 crystal form is 85-90 wt% of alpha-MnO 2; CeO2-ZrO2 solid solution carrier, and the La-MnO 3 accounts for 10-15 wt%. Preferably, the intermediate layer satisfies the following condition: The specific surface area of the carrier gamma-Al 2O3 is more than or equal to 200m < 2 >/g, the pore diameter is 5-10 nm, the K 2CO3 loading is 5-10 wt.%, the particle size is 100-200 nm, the Ag nanoparticle loading is 0.5-2 wt.%, the particle size is 20-50 nm, the weight ratio of the carrier Al 2O3 is 88-92 wt.%, the K 2CO3 is 5-10 wt.%, and the Ag is 0.5-2 wt.%. Preferably, the surface layer satisfies the following condition: the porosity of the FeCrAl alloy fiber is more than or equal to 40%, the fiber diameter is 10-20 mu m, the molar ratio of Cu to Fe is 3:1-1:1, the crystal form of CuO is a CuO nano rod, the crystal form of Fe 2O3 is Fe 2O3 nano particles, the FeCrAl carrier accounts for 75-80 wt%, the CuO accounts for 15-20 wt%, and the Fe 2O3 accounts for 5-10 wt%. Preferably, the bottom layer is prepared by the steps of: ①Ce(NO3)3·6H2 Mixing O) with ZrOCl 2·8H2 O according to a proportion, regulating the pH to 9-10 by ammonia water, and stirring to obtain CeO 2-ZrO2 sol; ②La(NO3)3 Dissolving with Mn (NO 3)2 in proportion, adding CeO 2-ZrO2 sol, aging to obtain slurry; ③ Spraying the slurry to the inner wall of the ceramic block by adopting spraying equipment, wherein the thickness is 50-100 mu m; ④ And (5) heat preservation after roasting. Preferably, the intermediate layer is prepared by the step