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US-20260124603-A1 - COMPOSITE CATALYST FOR HYDROGEN-SELECTIVE CATALYTIC REDUCTION, METHOD OF PREPARING THE SAME, AND AIR PURIFICATION DEVICE INCLUDING COMPOSITE CATALYST

US20260124603A1US 20260124603 A1US20260124603 A1US 20260124603A1US-20260124603-A1

Abstract

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

Inventors

  • Hyeonsu Heo
  • Seunghee Son
  • Dongjin Ham
  • Min Seok KOO
  • Kyeongmin Baek
  • Seoeun Jeong
  • Jaiyoung CHUNG
  • Jonghyun HA

Assignees

  • SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date
20260507
Application Date
20251014
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 unpurified air stream containing the first compound, the composite catalyst comprising: a support; and catalyst particles supported on the support, wherein the catalyst particles comprise a metal, a metal oxide, or a combination thereof, the metal comprises platinum and a platinum group element different from platinum, and a content of the 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 a combination thereof.
  3. 3 . The composite catalyst of claim 1 , wherein a mixing weight ratio of the platinum and the platinum group element is about 3:1 to about 1,000:1.
  4. 4 . The composite catalyst of claim 1 , wherein a content of the catalyst particles is about 0.1 weight percent to about 5 weight percent, based on a total weight of the composite catalyst.
  5. 5 . The composite catalyst of claim 1 , wherein the metal oxide is PtO x wherein 0<x≤2, PdO y wherein 0<x≤1, RuO x wherein 0<x≤2, OsO x wherein 0<x≤2, IrO x wherein 0<x≤2, Ru a O x wherein 0<a≤2, 0<x≤3, 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 represented by Formula 1: Pt x Pd y Formula 1 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 about 2 nanometers to about 50 nanometers.
  11. 11 . The composite catalyst of claim 10 , wherein the support is aluminosilicate, a ratio of silicon to aluminum in the aluminosilicate is 50 or less, and a volume of the mesopores in the support is about 20% to about 80%.
  12. 12 . The composite catalyst of claim 1 , wherein the composite catalyst is capable of use under conditions of an O 2 content of about 5 volume percent to about 20 volume percent and a temperature of about 70° C. to 125° C.
  13. 13 . The composite catalyst of claim 1 , wherein the composite catalyst has an NO conversion rate of 40% or more and a N 2 selectivity of more than 60% under conditions of an O 2 content of about 5 volume percent to about 20 volume percent and a temperature of about 70° C. to about 125° C.
  14. 14 . The composite catalyst of claim 1 , wherein the first compound comprises a volatile organic compound, wherein the volatile organic compound comprises a polar compound, a nonpolar compound, or a combination thereof, wherein the nonpolar compound comprises an aliphatic hydrocarbon, an aromatic hydrocarbon, or a combination thereof, the polar compound comprises 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 a combination thereof, the aromatic hydrocarbon comprises benzene, toluene, xylene, or a combination thereof, the amine compound comprises methylamine, dimethylamine, trimethylamine, ethylamine, aniline, or a combination thereof, the aldehyde compound comprises formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, or a combination thereof, the ketone compound comprises dimethyl ketone, methyl ethyl ketone, diethyl ketone, methyl propyl ketone, dipropyl ketone, or a combination thereof, the alcohol compound comprises methanol, ethanol, propanol, isopropanol, butanol, pentanol, hexanol, heptanol, or a combination thereof, the sulfur compound comprises hydrogen sulfide, sulfur dioxide, elemental sulfur, sulfur oxide, or a combination thereof, and the thiol compound comprises methanethiol, ethanethiol, 1-propanethiol, 2-propanethiol, butanethiol, tert-butyl mercaptan, thiophenol, or a combination thereof.
  15. 15 . A method of preparing a composite catalyst for hydrogen-selective catalytic reduction, the method comprising: providing a support; supporting a platinum-containing salt and a platinum group element-containing salt that does not include platinum as catalyst particle precursors on the support to obtain a support on which the catalyst particle precursors are supported; and mixing the support on which the catalyst particle precursors are supported 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 prepare the composite catalyst of claim 1 .
  16. 16 . The method of claim 15 , wherein the heat treating is performed at about 300° C. to about 900° C. in an inert gas atmosphere.
  17. 17 . The method of claim 15 , wherein the support is a support having mesopores, and wherein the support having mesopores is prepared by processes of: providing a bare support; contacting the bare support with an alkaline solution to prepare an alkali-treated support; heat treating the alkali-treated support to prepare a heat-treated porous support; contacting the heat-treated porous support with an ammonium salt-containing solution to prepare an ion exchange-treated support; and optionally drying the ion exchange-treated support; and heat-treating the optionally dried ion exchange-treated support.
  18. 18 . An air purification device comprising: a housing; and the composite catalyst of claim 1 , wherein the composite catalyst is located within the housing.
  19. 19 . The air purification device of claim 18 , wherein the air purification device has an operation temperature of about 70° C. to about 125° C., an oxygen content of about 5 volume percent to about 20 volume percent, and a nitrogen content of about 80 volume percent to about 95 volume percent.
  20. 20 . The air purification device of claim 18 , wherein in the air purification device, an amount of hydrogen gas injected is about 100 parts per million to about 40,000 parts per million, based on a total weight of exhaust gas and hydrogen gas.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is based on and claims priority to Korean Patent Application Nos. 10-2024-0153785, filed on Nov. 1, 2024, and 10-2025-0146552, filed on Oct. 13, 2025, in the Korean Intellectual Property Office, and all the benefits accruing therefrom under 35 U.S.C. § 119, the disclosures of which are incorporated by reference herein in its entirety. BACKGROUND 1. Field The disclosure relates to a composite catalyst for hydrogen-selective catalyst reduction (H2-SCR), a method of preparing the composite catalyst, and an air purification device including the composite catalyst. 2. Description of the Related Art Recently, due to the high integration of semiconductors in a variety of products, the types and amounts of reaction gases used during a manufacturing process of the semiconductors have increased. Accordingly, the types and amounts of harmful substances in harmful gases are also increasing, and thus various harmful gas treatment methods are being used. A heat recovery oxidation method using a regenerative thermal oxidizer (RTO) is a known method of treating harmful gases. This method has a very high heat recovery efficiency of 95% or more by recovering and reusing waste heat and has also a very high processing efficiency of 98% or more, and thus is currently widely used in the latter stages of a semiconductor process. However, during the RTO process, harmful gases containing highly toxic harmful substances such as nitrogen oxides (NOx), silane, tetramethyl silane, trimethylamine, halogens, hydrocarbons, and sulfur compounds may be generated during the latter stages. Malodorous gases that are emitted without being treated in the RTO process may cause air pollution and have a negative impact on the human body. Therefore, there is a need for an efficient pollutant removal method that can be applied where malodorous and/or harmful gases are generated and not removed in the latter stages of the RTO process. SUMMARY Provided is a composite catalyst for H2-SCR, which provides improved harmful gas removal capability. Provided is a method of preparing the composite catalyst for H2-SCR. Provided is an air purification device including the composite catalyst for H2-SCR. Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments of the disclosure. According to an aspect of the disclosure, a composite catalyst for hydrogen-selective catalyst reduction (H2-SCR) is configured to remove a first compound from an unpurified air stream containing the first compound, and includes a support andcatalyst particles supported on the support,wherein the catalyst particles include a metal, a metal oxide, or a combination thereof,the metal includes platinum and a platinum group element different from platinum, andthe content of the 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 a mixing weight ratio of the platinum and the platinum group element may be 3:1 to 1,000:1, or 4:1 to 300:1. The content of the catalyst particles may be about 0.1 weight percent (wt %) to about 5 wt % based on the total weight of the composite catalyst. The metal oxide may be PtOx wherein 0<x≤2, PdOy wherein 0<x≤1, RuOx wherein 0<x≤2, RuaOx wherein 0<a≤2, 0<x≤3, OsOx wherein 0<x≤2, IrOx wherein 0<x≤2, or a combination thereof, and, for example, may be PdO, PtO2, RuO2, Rh2O3, OSO2, Ir2O3, or a combination thereof. The support may include SiO2, Al2O3, zeolite, TiO2, 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) rate of 50 or less and a mesopore volume rate 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 Formula 1 below: wherein 0.8<x≤0.99 and 0.01≤y≤0.2. The support may further include mesopores, and an 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 about 5 nm to about 300 nm, the average particle diameter of the platinum may be about 5 nm to about 300 nm. When the catalyst particles have an alloy forms, the average particle diameter of the catalyst particles may have the above-described range. When the catalyst particles have separate particle forms, and the average particle diameter of the platinum group element may be about 1 nm to about 10 nm. Here, the platinum group element may be, for example, palladium. The composite catalyst according to an embodiment may be