Descontinuado (Descontinuado) CE6678 Catalisadores de Cerio-Zircônio-Lantânio-Itrio 24CeO2-60Zr(Hf)O2-3.5La2O3

Cerium-Zirconium-Lanthanum-Yttrium Catalysts Description

Cerium-Zirconium-Lanthanum-Yttrium Catalyst (24CeO₂-60Zr(Hf)O₂-3.5La₂O₃-12.5Y₂O₃) is an advanced mixed oxide material designed for demanding catalytic environments, particularly in automotive and industrial emission control systems. Its formulation is optimized to deliver high redox activity, thermal stability, and long-lasting performance even under extreme operating conditions.

The cerium component (CeO₂) plays a central role by providing dynamic oxygen storage and release capabilities through reversible Ce⁴⁺/Ce³⁺ redox cycling. This mechanism is crucial for managing lean-to-rich transitions in three-way catalysts, where maintaining optimal air-to-fuel ratios is essential for effective pollutant conversion. Zirconium or hafnium oxide (Zr(Hf)O₂) significantly enhances the thermal stability of the material and prevents sintering, preserving the active surface area during high-temperature exposure.

The inclusion of lanthanum oxide (La₂O₃) improves the textural properties of the catalyst by increasing surface area and promoting thermal durability. Yttrium oxide (Y₂O₃), present in a relatively high proportion, contributes to phase stabilization, enhances resistance to thermal shock, and helps maintain a stable crystal lattice structure throughout extended redox cycles.

Collectively, these properties result in a robust and efficient catalyst support material that is particularly suited for applications requiring repeated oxidation-reduction cycling, such as in automotive catalytic converters, fuel processing, and industrial gas treatment systems. The formulation ensures excellent dispersion of noble metals and retains its structural and chemical integrity under prolonged thermal stress.

Cerium-Zirconium-Lanthanum-Yttrium Catalysts Applications

1. Automotive Three-Way Catalytic Converters (TWCs): Act as an oxygen storage component and support for noble metals (like Pt, Pd, Rh), helping convert CO, NOₓ, and hydrocarbons into less harmful gases while maintaining optimal performance during lean-rich transitions.

2. Gasoline Particulate Filters (GPFs) and Diesel Oxidation Catalysts (DOCs): Enhance soot oxidation and improve emission control in gasoline and diesel exhaust treatment systems under varying operating temperatures.

3. Industrial Emission Control: Used in fixed-bed and monolithic catalyst systems for the abatement of VOCs (volatile organic compounds), CO, and other hazardous gases in power plants, refineries, and chemical manufacturing facilities.

4. Fuel Reforming Catalysts: Serve as a component or support in steam reforming or partial oxidation processes for hydrogen production, benefiting from high redox reactivity and sintering resistance.

5. Solid Oxide Fuel Cells (SOFCs): Employed as a buffer layer or support in SOFCs due to their ionic conductivity, phase stability, and compatibility with other cell components.

6. Oxygen and Gas Sensors: Used in sensing devices where quick and reversible oxygen exchange is critical for real-time detection and monitoring.

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

Cerium-Zirconium-Lanthanum-Yttrium Catalyst (24CeO₂-60Zr(Hf)O₂-3.5La₂O₃-12.5Y₂O₃) is typically prepared through a co-precipitation method in which aqueous solutions of cerium nitrate, zirconium salt (e.g., zirconium chloride or nitrate), lanthanum nitrate, yttrium nitrate, and other rare earth metal salts are mixed together in stoichiometric ratios. The solution is then reacted with a precipitating agent, such as ammonium hydroxide or sodium carbonate, under controlled pH conditions to form a precipitate. The precipitate is aged to enhance uniformity and crystallinity, then filtered, washed thoroughly to remove residual salts, and dried at moderate temperatures. After drying, the material is calcined at high temperatures (typically between 500°C and 800°C) to convert the precursor to the desired mixed oxide phase with the appropriate crystallinity and phase structure. This process ensures the catalyst has high surface area, thermal stability, and oxygen storage capacity, making it suitable for catalytic applications in automotive and industrial emission control systems.