Снято с производства (Снято с производства) Катализаторы на основе церия-циркония-лантана-иттерия 40CeO2-50Zr(Hf)O2-5La2O3

Cerium-Zirconium-Lanthanum-Yttrium Catalysts Description

Cerium-Zirconium-Lanthanum-Yttrium Catalysts (40CeO₂-50Zr(Hf)O₂-5La₂O₃-5Y₂O₃) are advanced mixed oxide systems designed to meet the rigorous demands of automotive and industrial emission control environments. This catalyst exhibits excellent redox behavior, superior resistance to thermal degradation, and long-term structural stability, even under harsh operational conditions.

Cerium oxide (CeO₂) plays a central role by facilitating dynamic oxygen storage and release through reversible Ce⁴⁺/Ce³⁺ transitions, a critical mechanism for managing variable air-to-fuel ratios in three-way catalytic converters and ensuring effective conversion of pollutants. The inclusion of zirconium or hafnium oxide (Zr(Hf)O₂) enhances thermal durability, minimizes sintering, and helps maintain a high surface area during high-temperature operation.

Lanthanum oxide (La₂O₃) contributes by improving surface texture and increasing resistance to heat-induced structural degradation, while yttrium oxide (Y₂O₃) stabilizes the crystalline phase, strengthens resistance to thermal shock, and reinforces lattice integrity across repeated redox cycles.

These combined attributes result in a catalyst that is not only thermally resilient and redox-efficient but also capable of uniformly dispersing active metal species. This makes it ideal for use in catalytic converters, hydrogen production, and air pollution control, ensuring performance stability and material longevity even during extended operation in severe thermal environments.

Cerium-Zirconium-Lanthanum-Yttrium Catalysts (40CeO₂-50Zr(Hf)O₂-5La₂O₃-5Y₂O₃) Applications

1. Automotive Three-Way Catalytic Converters (TWCs): Function as oxygen storage components and substrates for precious metals like platinum, palladium, and rhodium, enabling the effective conversion of carbon monoxide, nitrogen oxides, and unburned hydrocarbons into less harmful substances during both lean and rich engine conditions.

2. Gasoline Particulate Filters (GPFs) and Diesel Oxidation Catalysts (DOCs): Support soot combustion and enhance overall exhaust purification in gasoline and diesel engines, maintaining high efficiency across variable temperature ranges.

3. Industrial Emissions Abatement: Incorporated into fixed-bed and monolithic systems to control emissions of VOCs, CO, and other hazardous gases in industrial settings such as power generation facilities, chemical plants, and oil refineries.

4. Catalysts for Fuel Reforming: Employed as active catalysts or catalyst supports in hydrogen production via steam reforming and partial oxidation, benefiting from strong redox performance and thermal robustness.

5. Solid Oxide Fuel Cells (SOFCs): Used as interlayers or supports due to their phase stability, compatibility with cell materials, and ability to conduct oxygen ions efficiently.

6. Oxygen and Gas Sensing Devices: Applied in sensors requiring fast and reversible oxygen exchange for accurate and real-time monitoring of gas compositions.

Cerium-Zirconium-Lanthanum-Yttrium Catalysts (40CeO₂-50Zr(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 (40CeO₂-50Zr(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 (40CeO₂-50Zr(Hf)O₂-5La₂O₃-5Y₂O₃) is commonly prepared through a co-precipitation method. In this process, aqueous solutions containing cerium nitrate, zirconium salts (such as zirconium chloride or nitrate), lanthanum nitrate, yttrium nitrate, and other rare earth precursors are mixed in predetermined stoichiometric ratios. A precipitating agent, such as ammonium hydroxide or sodium carbonate, is then introduced under carefully controlled pH conditions to induce precipitation. The formed precipitate is aged to promote structural homogeneity and improve crystallinity, after which it is filtered and extensively washed to eliminate residual ions. The material is then dried at moderate temperatures and subsequently calcined at elevated temperatures, typically between 500°C and 800°C, to yield the final mixed oxide with the desired crystal structure and physicochemical properties. This synthesis route produces a catalyst with high surface area, strong redox behavior, and excellent thermal stability, making it highly suitable for use in emission control technologies and other demanding catalytic environments.