Descontinuado (Descontinuado) Catalisadores de cerio-zircônio-lantânio-itrio (30CeO2-60Zr(Hf)O2-5La2O3)

Cerium-Zirconium-Lanthanum-Yttrium Catalysts Description

Cerium-Zirconium-Lanthanum-Yttrium Catalysts (30CeO₂-60Zr(Hf)O₂-5La₂O₃-5Y₂O₃) represent a high-performance mixed oxide material specifically engineered for challenging catalytic applications, such as in automotive and industrial emission control systems. This catalyst is optimized to offer superior redox activity, outstanding thermal stability, and long-term durability even in extreme operational environments.

The cerium oxide (CeO₂) component is essential for its ability to store and release oxygen dynamically via reversible Ce⁴⁺/Ce³⁺ redox cycles, which are vital for managing fluctuating air-fuel ratios in three-way catalysts, thereby ensuring efficient pollutant reduction. Zirconium or hafnium oxide (Zr(Hf)O₂) significantly boosts thermal stability, preventing sintering and preserving the catalyst’s surface area during high-temperature operations.

Lanthanum oxide (La₂O₃) enhances the catalyst’s texture by increasing its surface area and improving thermal resistance, while yttrium oxide (Y₂O₃) provides phase stabilization, bolsters resistance to thermal shock, and ensures the structural integrity of the crystal lattice during repeated redox cycles.

Together, these elements create a robust and efficient catalyst, ideal for applications requiring frequent oxidation-reduction cycles, such as in catalytic converters, fuel processing, and industrial gas treatment. The formulation allows for excellent dispersion of noble metals, ensuring stable performance and maintaining structural and chemical integrity under prolonged thermal stress.

Cerium-Zirconium-Lanthanum-Yttrium Catalysts Applications

1. Automotive Three-Way Catalytic Converters (TWCs): Serve as an oxygen storage medium and a support for noble metals such as Pt, Pd, and Rh, facilitating the conversion of CO, NOₓ, and hydrocarbons into less harmful emissions while ensuring consistent performance during lean and rich cycles.

2. Gasoline Particulate Filters (GPFs) and Diesel Oxidation Catalysts (DOCs): Aid in the oxidation of soot and enhance emission control for both gasoline and diesel engines, operating efficiently across a wide range of temperatures.

3. Industrial Emission Control: Applied in both fixed-bed and monolithic catalyst systems to reduce volatile organic compounds (VOCs), carbon monoxide, and other toxic gases in industrial environments like power plants, refineries, and chemical factories.

4. Fuel Reforming Catalysts: Act as either a catalyst or support in steam reforming and partial oxidation processes for hydrogen production, offering excellent redox properties and resistance to sintering at high temperatures.

5. Solid Oxide Fuel Cells (SOFCs): Used as a buffer layer or support material in SOFCs, providing high ionic conductivity, structural stability, and compatibility with other cell components.

6. Oxygen and Gas Sensors: Utilized in oxygen sensing applications where rapid and reversible oxygen exchange is essential for real-time detection and monitoring of gases.

Cerium-Zirconium-Lanthanum-Yttrium Catalysts 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 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 (30CeO₂-60Zr(Hf)O₂-5La₂O₃-5Y₂O₃) is typically synthesized using a co-precipitation technique. In this method, aqueous solutions of cerium nitrate, zirconium salts (such as zirconium chloride or nitrate), lanthanum nitrate, yttrium nitrate, and other rare earth metal salts are combined in specific stoichiometric proportions. A precipitating agent, like ammonium hydroxide or sodium carbonate, is then added under controlled pH conditions to form a precipitate. The precipitate is aged to improve uniformity and crystallinity, followed by filtration and thorough washing to remove any excess salts. The resulting material is then dried at moderate temperatures before being calcined at high temperatures (usually between 500°C and 800°C) to transform it into the desired mixed oxide phase with the correct crystallinity and structure. This preparation process ensures the catalyst possesses a high surface area, excellent thermal stability, and efficient oxygen storage capacity, making it ideal for use in catalytic applications, especially for automotive and industrial emission control systems.