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CN-121988374-A - Composite catalyst for hydrogen selective catalytic reduction, method of preparing the same, and air cleaning apparatus including the composite catalyst

CN121988374ACN 121988374 ACN121988374 ACN 121988374ACN-121988374-A

Abstract

Provided are a composite catalyst for H 2 -SCR, a method of preparing the same, and an air cleaning device including the composite catalyst configured to remove a first compound from an uncleaned air stream containing the first compound, and including a support and catalyst particles supported on the support, wherein the catalyst particles include a metal including platinum and a platinum group element, and the content of platinum is 3 parts by weight or more per 1 part by weight of the platinum group element, a metal oxide, or a combination thereof.

Inventors

  • Xu Xuanzhu
  • SUN SHENGXI
  • Xian Dongzhen
  • Ju Minshi
  • Bai Jingmin
  • ZHENG XIEN
  • ZHENG ZAIYONG
  • HE ZONGXUAN

Assignees

  • 三星电子株式会社

Dates

Publication Date
20260508
Application Date
20251030
Priority Date
20241101

Claims (20)

  1. 1. A composite catalyst for hydrogen selective catalytic reduction, wherein the composite catalyst is configured to remove a first compound from an uncleaned air stream containing the first compound, the composite catalyst comprising: A carrier, and Catalyst particles supported on the carrier, Wherein the catalyst particles comprise a metal, a metal oxide, or a combination thereof, The metal includes platinum and a platinum group element other than platinum, and The content of platinum is 3 parts by weight or more per 1 part by weight of the platinum group element.
  2. 2. The composite catalyst of claim 1, wherein the platinum group element is palladium, ruthenium, rhodium, osmium, iridium, or combinations thereof.
  3. 3. The composite catalyst of claim 1, wherein the mixing weight ratio of platinum to the platinum group element is from 3:1 to 1,000:1.
  4. 4. The composite catalyst of claim 1, wherein the catalyst particles are present in an amount of 0.1 wt% to 5wt%, based on the total weight of the composite catalyst.
  5. 5. The composite catalyst of claim 1, wherein the metal oxide is PtO x where 0< x-2, pdO x where 0< x-1, ruO x where 0< x-2, osO x where 0< x-2, irO x where 0< x-2, rhO x where 0< x-2, or a combination thereof.
  6. 6. The composite catalyst of claim 1, wherein the support is SiO 2 、Al 2 O 3 , zeolite, tiO 2 , or a combination thereof.
  7. 7. The composite catalyst of claim 1, wherein the composite catalyst comprises platinum and palladium.
  8. 8. The composite catalyst of claim 7, wherein the composite catalyst further comprises an oxide of platinum and an oxide of palladium.
  9. 9. The composite catalyst of claim 1, wherein the composite catalyst is an alloy represented by formula 1: 1 (1) Pt x Pd y Wherein in formula 1, 0.8≤x≤0.99, and 0.01≤y≤0.2.
  10. 10. The composite catalyst of claim 1, wherein The support further comprises mesopores, and The mesopores have an average size of 2 nm to 50 nm.
  11. 11. The composite catalyst of claim 10, wherein The carrier is an aluminosilicate which is used as a carrier, A ratio of silicon to aluminum in the aluminosilicate of 50 or less, and The volume of the mesopores in the support is 20 to 80%.
  12. 12. The composite catalyst of claim 1, wherein the composite catalyst is capable of being used under conditions of an O 2 content of 5 to 20% by volume and a temperature of 70 to 125 ℃.
  13. 13. The composite catalyst of claim 1, wherein the composite catalyst has a NO conversion of 40% or more and an N 2 selectivity of greater than 60% at an O 2 content of 5 to 20% by volume and a temperature of 70 to 125 ℃.
  14. 14. The composite catalyst according to claim 1, wherein the first compound comprises a volatile organic compound, Wherein the volatile organic compound comprises a polar compound, a non-polar compound, or a combination thereof, wherein the non-polar compound comprises an aliphatic hydrocarbon, an aromatic hydrocarbon, or a combination thereof, The polar compound includes ammonia, urea, an amine compound, an aldehyde compound, a ketone compound, an alcohol compound, a sulfur compound, a thiol compound, a halogenated hydrocarbon, a nitrogen oxide, ozone, or a combination thereof, The aliphatic hydrocarbon comprises methane, ethane, propane, butane, pentane, hexane, or combinations thereof, The aromatic hydrocarbon comprises benzene, toluene, xylene, or a combination thereof, The amine compound includes methyl amine, dimethyl amine, trimethyl amine, ethyl amine, aniline, or a combination thereof, The aldehyde compound includes formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, or a combination thereof, The ketone compound includes dimethyl ketone, methyl ethyl ketone, diethyl ketone, methyl propyl ketone, dipropyl ketone, or a combination thereof, The alcohol compound includes methanol, ethanol, propanol, isopropanol, butanol, pentanol, hexanol, heptanol, or combinations thereof, The sulfur compound comprises hydrogen sulfide, sulfur dioxide, elemental sulfur, sulfur oxides, or a combination thereof, and The thiol compound includes methyl thiol, ethyl thiol, 1-propanethiol, 2-propanethiol, butanethiol, t-butylmercaptan, thiophenol, or a combination thereof.
  15. 15. A method of preparing a composite catalyst for hydrogen selective catalytic reduction, the method comprising: Providing a carrier; loading a platinum group element-containing salt and a platinum group element-containing salt excluding platinum as a catalyst particle precursor on the carrier to obtain a carrier having the catalyst particle precursor loaded thereon, and Mixing the support having the catalyst particle precursor supported thereon with a reducing agent to obtain a mixture on the support; optionally drying the mixture on the support, and Heat treating the dried mixture on the support to produce the composite catalyst of any one of claims 1 to 14.
  16. 16. The method of claim 15, wherein the heat treatment is performed in an inert gas atmosphere at 300 ℃ to 900 ℃.
  17. 17. The method of claim 15, wherein the support is a support having mesopores, and wherein the support having mesopores is prepared by the process of: providing a bare carrier; contacting the bare support with an alkaline solution to produce an alkali-treated support; Heat treating the alkali-treated support to produce a heat-treated porous support; contacting the heat treated porous support with a solution containing an ammonium salt to produce an ion exchange treated support, and Optionally drying the ion-exchange treated support, and The optionally dried ion-exchange treated support is heat treated.
  18. 18. An air cleaning device comprising: A housing, and The composite catalyst according to any one of claim 1 to 14, Wherein the composite catalyst is located within the housing.
  19. 19. An air cleaning device as claimed in claim 18, wherein The air cleaning device has an operating temperature of 70 to 125C, An oxygen content of 5 to 20% by volume, and Nitrogen content of 80 to 95% by volume.
  20. 20. The air purification apparatus of claim 18, wherein the amount of hydrogen gas injected in the air purification apparatus is 100 parts per million to 40,000 parts per million based on the total weight of the exhaust gas and the hydrogen gas.

Description

Composite catalyst for hydrogen selective catalytic reduction, method of preparing the same, and air cleaning apparatus including the composite catalyst Cross reference to related applications The present application is based on the priority of korean patent application No. 10-2024-0153785 filed at 1 of 11 of 2024 and korean patent application No. 10-2025-0146552 filed at 13 of 10 of 2025, and the ownership rights generated thereby, the disclosures of which are incorporated herein by reference in their entirety. Technical Field The present disclosure relates to a composite catalyst for hydrogen selective catalytic reduction (H 2 -SCR), a method of preparing the composite catalyst, and an air purification device including the composite catalyst. Background Recently, due to the high integration of semiconductors in various products, the types and amounts of reactive gases used during the manufacturing process of semiconductors are increasing. Accordingly, the types and amounts of harmful substances in the harmful gas are also increasing, and thus, various harmful gas treatment methods are being used. The heat recovery oxidation process using a Regenerative Thermal Oxidizer (RTO) is a known process for treating hazardous gases. By recovering and reusing the waste heat, the method has a very high heat recovery efficiency of 95% or more and also has a very high treatment efficiency of 98% or more, and thus is currently widely used in the latter stages of semiconductor processes. However, during RTO processes, hazardous gases containing highly toxic hazardous substances such as nitrogen oxides (nitrogen oxides) (NOx), silanes, tetramethylsilane, trimethylamine, halogens, hydrocarbons, and sulfur compounds may be generated during the later stages. Malodorous gases discharged untreated in the RTO process may cause air pollution and have a negative effect on the human body. Thus, there is a need for an efficient contaminant removal process that can be applied in situations where malodors and/or harmful gases are generated and not removed in a later stage of the RTO process. Disclosure of Invention A composite catalyst for H 2 -SCR is provided that provides improved harmful gas removal capability. Methods of preparing a composite catalyst for H 2 -SCR are provided. An air purification device is provided that includes a composite catalyst for H 2 -SCR. Additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the presented embodiments of the disclosure. According to one aspect of the present disclosure, a composite catalyst for hydrogen selective catalytic reduction (H 2 -SCR) is configured to remove a first compound from an uncleaned air stream containing the first compound, and includes Carrier and method for producing the same Catalyst particles supported on the carrier, Wherein the catalyst particles comprise a metal, a metal oxide, or a combination thereof, The metal includes platinum and a platinum group element other than platinum, and The content of platinum is 3 parts by weight or more based on 1 part by weight of the platinum group element. The platinum group element may be palladium (Pd), ruthenium (Ru), rhodium (Rh), osmium (Os), iridium (Ir), or a combination thereof, and the mixed weight ratio of platinum to the platinum group element may be 3:1 to 1,000:1, or 4:1 to 300:1. The catalyst particles may be present in an amount of about 0.1 weight percent (wt%) to about 5 wt%, based on the total weight of the composite catalyst. The metal oxide may be PtO x where 0< x≤2, pdO x where 0< x≤1, ruO x where 0< x≤2, rhO x where 0< x≤2, osO x where 0< x≤2, irO x where 0< x≤2, or a combination thereof, and may be, for example, pdO, ptO 2、RuO2、Rh2O3、OsO2、Ir2O3, or a combination thereof. The support may comprise SiO 2、Al2O3, zeolite, tiO 2, or a combination thereof. The support may be an aluminosilicate in an amorphous or crystalline state. The support may be an aluminosilicate and may have a silicon to aluminum (Si/Al) ratio of 50 or less and a mesoporous (mesoporous) volume ratio of about 20% to about 80%. The composite catalyst may include platinum (Pt) and palladium (Pd). The composite catalyst may further include oxides of platinum (Pt) and palladium (Pd). The composite catalyst may include a compound represented by the following formula 1: 1 (1) PtxPdy Wherein x is more than or equal to 0.8 and less than or equal to 0.99 and y is more than or equal to 0.01 and less than or equal to 0.2. The support may further comprise mesopores, and the average size of the mesopores is about 2 nanometers (nm) to about 50 nm. In the composite catalyst, the average particle diameter of the catalyst particles may be from about 5nm to about 300 nm. When the catalyst particles have an alloy form, the average particle diameter of the catalyst particles may have the above-described range. When the catalyst particles have an isolated