Discontinued (Discontinued) CE6680 Cerium-zirconium-lanthanum-yttrium catalysts (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 developed for demanding catalytic applications, especially in vehicles and industrial emissions control systems. This catalyst is designed to provide superior redox activity, exceptional thermal stability, and long-lasting performance even under harsh operating conditions.

Cerium oxide (CeO₂) plays a critical role by enabling dynamic oxygen storage and release through reversible Ce⁴⁺/Ce³⁺ redox cycles, which are essential for regulating the air-fuel ratio in three-way catalysts and achieving efficient pollutant reduction. Zirconium or Hafnium oxide (Zr(Hf)O₂) enhances the thermal stability of the catalyst, prevents sintering, and maintains the surface at elevated temperatures.

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

The combination of these components results in a highly effective catalyst suitable for applications that require frequent redox cycles, such as in catalytic converters, fuel processing, and industrial gas treatment. The formulation ensures excellent dispersion of precious metals, guaranteeing stable performance while maintaining structural and chemical integrity even under prolonged thermal stress.

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

1. Automotive Three-Way Catalysts (TWC): Function as oxygen storage and carriers for precious metals such as Pt, Pd, and Rh, aiding the conversion of CO, NOₓ, and hydrocarbons into less harmful emissions while maintaining consistent performance during lean and rich cycles.

2. Gasoline Particulate Filters (GPF) and Diesel Oxidation Catalysts (DOC): Support the oxidation of soot and enhance emission control for both gasoline and diesel engines, operating effectively across 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 facilities such as power plants, refineries, and chemical production sites.

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

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

6. Oxygen and Gas Sensors: Utilised in sensors where fast and reversible oxygen exchange is crucial 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 custom boxes of various sizes, tailored to the dimensions of the materials. Smaller items are securely packed in PP cartons, while larger items are placed in bespoke wooden crates. We adhere to strict compliance regarding packaging adaptation and the use of appropriate cushioning materials to ensure optimal protection during transport.

Packaging: Carton, wooden crate, or customised.

Please refer to the packaging details for more information.

Manufacturing Process

1)Testing Procedures

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

(2)Testing of mechanical properties - Includes tensile strength, yield strength, and elongation tests to evaluate material performance.

(3)Dimensional testing - Measures thickness, width, and length to ensure compliance with specified tolerances.

(4)Surface quality inspection - Checking for defects such as scratches, cracks, or inclusions through visual and ultrasonic inspection.

(5)Hardness testing - Determining the material hardness to confirm uniformity and mechanical reliability.

For detailed information, please refer to the SAM Testing Procedures.

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

Q1. What is this catalyst used for?

It is primarily utilised in automotive catalysts, gasoline particulate filters, industrial emissions control systems, and fuel reforming applications where high thermal stability and oxygen storage capability are required.

Q2. What advantages does it offer over conventional cerium-zirconium materials?

The inclusion of lanthanum and yttrium oxides improves thermal resistance, increases surface area, and stabilises the catalyst structure during redox cycles, making it more durable and efficient under harsh conditions.

Q3. How does it contribute to emission reduction?

It facilitates rapid oxygen release and uptake during transitions to a lean state, thus enhancing the conversion of CO, NOₓ, and hydrocarbons into harmless gases in three-way catalysts.

Performance Comparison Table with Competing Products

Related Information

1.Common Preparation Methods

The Cerium-Zirconium-Lanthanum-Yttrium Catalyst (60CeO₂-30Zr(Hf)O₂-5La₂O₃-5Y₂O₃) is typically prepared using 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 stoichiometric amounts. A precipitating agent, such as 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 thoroughly washed to remove any residual salts. After washing, the material is dried at moderate temperatures and subsequently calcined at high temperatures (typically between 500 °C and 800 °C) to convert it into the desired mixed oxide phase with optimal crystallinity and structure. This manufacturing method results in a catalyst with a large surface area, excellent thermal stability, and effective oxygen storage capacity, making it suitable for catalytic applications, particularly in vehicles and industrial emissions control systems.