Снято с производства (Снято с производства) Катализаторы церия-циркония-лантана-итрия (60CeO2-30Zr(Hf)O2-5La2O3-5Y2O3)

Cerium-Zirconium-Lanthanum-Yttrium Catalysts Description

Cerium-Zirconium-Lanthanum-Yttrium Catalysts (60CeO₂-30Zr(Hf)O₂-5La₂O₃-5Y₂O₃) are high-performance mixed oxide materials specifically developed for demanding catalytic applications, particularly in automotive and industrial emission control systems. This catalyst is engineered to deliver superior redox activity, exceptional thermal stability, and long-lasting performance, even under harsh operational conditions.

The cerium oxide (CeO₂) plays a crucial role by enabling dynamic oxygen storage and release through reversible Ce⁴⁺/Ce³⁺ redox cycles, essential for regulating air-fuel ratios in three-way catalytic converters and ensuring efficient pollutant reduction. Zirconium or hafnium oxide (Zr(Hf)O₂) enhances the thermal stability of the catalyst, preventing sintering and maintaining the surface area during high-temperature operations.

Lanthanum oxide (La₂O₃) improves the catalyst's texture by increasing surface area and enhancing thermal resistance, while yttrium oxide (Y₂O₃) contributes to phase stabilization, strengthens resistance to thermal shock, and preserves the crystal lattice integrity during repeated redox cycles.

The combination of these components results in a highly effective catalyst, perfect for applications that require frequent redox cycling, such as in catalytic converters, fuel processing, and industrial gas treatment. The formulation ensures excellent dispersion of noble metals, guaranteeing stable performance and maintaining structural and chemical integrity over extended thermal stress.

Cerium-Zirconium-Lanthanum-Yttrium Catalysts (60CeO₂-30Zr(Hf)O₂-5La₂O₃-5Y₂O₃) Applications

1. Automotive Three-Way Catalytic Converters (TWCs): Function as an oxygen storage medium and a support for noble metals like Pt, Pd, and Rh, aiding in the conversion of CO, NOₓ, and hydrocarbons into less harmful emissions while maintaining steady performance during lean and rich cycles.

2. Gasoline Particulate Filters (GPFs) and Diesel Oxidation Catalysts (DOCs): Support the oxidation of soot and improve emission control for both gasoline and diesel engines, operating effectively over a wide temperature range.

3. Industrial Emission Control: Used in fixed-bed and monolithic catalyst systems to reduce volatile organic compounds (VOCs), carbon monoxide, and other hazardous gases in industrial settings such as power plants, refineries, and chemical manufacturing facilities.

4. Fuel Reforming Catalysts: Serve as either a catalyst or a support in steam reforming and partial oxidation processes for hydrogen production, providing excellent redox activity and resistance to sintering under high-temperature conditions.

5. Solid Oxide Fuel Cells (SOFCs): Employed as a buffer layer or support in SOFCs, offering high ionic conductivity, structural stability, and compatibility with other components of the fuel cell.

6. Oxygen and Gas Sensors: Used in sensors where fast and reversible oxygen exchange is critical for real-time detection and monitoring of gases.

Cerium-Zirconium-Lanthanum-Yttrium Catalysts (60CeO₂-30Zr(Hf)O₂-5La₂O₃-5Y₂O₃) Packaging

Our products are packaged in customized cartons of various sizes based on the material dimensions. Small items are securely packed in PP boxes, while larger items are placed in custom wooden crates. We ensure strict adherence to packaging customization and the use of appropriate cushioning materials to provide optimal protection during transportation.

Packaging: Carton, Wooden Box, or Customized.

Kindly review the packaging details provided for your reference.

Manufacturing Process

1.       Testing Method

(1)    Chemical Composition Analysis - Verified using techniques such as GDMS or XRF to ensure compliance with purity requirements.

(2)    Mechanical Properties Testing - Includes tensile strength, yield strength, and elongation tests to assess material performance.

(3)    Dimensional Inspection - Measures thickness, width, and length to ensure adherence to specified tolerances.

(4)    Surface Quality Inspection - Checks for defects such as scratches, cracks, or inclusions through visual and ultrasonic examination.

(5)    Hardness Testing - Determines material hardness to confirm uniformity and mechanical reliability.

Please refer to the SAM testing procedures for detailed information.

Cerium-Zirconium-Lanthanum-Yttrium Catalysts (60CeO₂-30Zr(Hf)O₂-5La₂O₃-5Y₂O₃) FAQs

Q1. What is this Catalyst used for?

It is primarily used in automotive catalytic converters, gasoline particulate filters, industrial emission control systems, and fuel reforming applications where high thermal stability and oxygen storage capacity are required.

Q2. What advantages does it offer over traditional ceria-zirconia materials?

The addition of lanthanum and yttrium oxides enhances thermal resistance, increases surface area, and stabilizes the catalyst structure during redox cycling, making it more durable and efficient under harsh conditions.

Q3. How does it help reduce emissions?

It facilitates rapid oxygen release and uptake during lean-rich transitions, improving the conversion of CO, NOₓ, and hydrocarbons into harmless gases in three-way catalytic converters.

Performance Comparison Table with Competitive Products

Related Information

1.       Common Preparation Methods

The Cerium-Zirconium-Lanthanum-Yttrium Catalyst (60CeO₂-30Zr(Hf)O₂-5La₂O₃-5Y₂O₃) is typically produced through a co-precipitation method. In this process, aqueous solutions of cerium nitrate, zirconium salts (such as zirconium chloride or nitrate), lanthanum nitrate, yttrium nitrate, and other rare earth metal salts are mixed in precise stoichiometric amounts. A precipitating agent, like ammonium hydroxide or sodium carbonate, is added under controlled pH conditions to form a precipitate. The precipitate is then aged to enhance its uniformity and crystallinity before being filtered and washed thoroughly to remove any residual salts. After washing, the material is dried at moderate temperatures and then calcined at high temperatures (typically between 500°C and 800°C) to convert it into the desired mixed oxide phase with the proper crystallinity and structure. This preparation method results in a catalyst with a high surface area, excellent thermal stability, and effective oxygen storage capacity, making it well-suited for catalytic applications, particularly in automotive and industrial emission control systems.