Descontinuado (Descontinuado) CE6683 Catalisador de Cerio-Zircônio-Itérbio (58.5CeO2-33.5Zr(Hf)O2-8Y2O3)

Cerium-Zirconium-Yttrium Catalyst Description

The Cerium-Zirconium-Yttrium Catalyst (58.5CeO₂-33.5Zr(Hf) O₂-8Y₂O₃) is a high-performance mixed oxide catalyst that combines the unique properties of cerium, zirconium, and yttrium to optimize catalytic efficiency and durability, especially in high-temperature environments.

Cerium oxide (CeO₂) plays a critical role in the catalyst’s excellent oxygen storage capacity (OSC), enabling dynamic oxygen release and uptake through reversible Ce⁴⁺/Ce³⁺ redox cycles. This feature is essential in automotive and industrial emission control, where rapid changes in air-to-fuel ratios occur. The redox cycling capability also supports efficient pollutant conversion and ensures the catalyst remains active over long operational periods.

Zirconium oxide (ZrO₂), often stabilized with hafnium, enhances the catalyst’s thermal stability and prevents sintering, which is crucial for maintaining the active surface area at high temperatures. The zirconium component helps resist phase transitions that can degrade catalytic performance, ensuring consistent activity during long-term use.

Yttrium oxide (Y₂O₃) contributes to the overall phase stability of the catalyst, helping to maintain the integrity of the crystal structure during repeated redox cycles. Additionally, yttrium improves resistance to thermal shock and increases the mechanical strength of the catalyst material. Together, these elements create a highly durable and efficient catalyst, making it ideal for use in automotive catalytic converters, fuel reforming, and industrial gas treatment applications. The synergy between cerium, zirconium, and yttrium ensures this catalyst provides long-lasting performance under demanding operational conditions.

Cerium-Zirconium-Yttrium Catalyst Applications

1. Automotive Catalytic Converters: This catalyst is widely used in automotive emission control systems to reduce harmful pollutants like carbon monoxide (CO), nitrogen oxides (NOₓ), and hydrocarbons (HC). Its oxygen storage capacity and redox cycling ability are crucial for the efficient operation of three-way catalytic converters, ensuring effective pollutant reduction under fluctuating air-fuel ratios.

2. Gasoline and Diesel Particulate Filters (GPFs and DOCs): It aids in the oxidation of soot particles and reduces emissions in both gasoline and diesel engine exhaust systems. Its high thermal stability ensures the catalyst remains active across a wide range of engine temperatures.

3. Industrial Emission Control: Used in industrial catalytic processes for reducing volatile organic compounds (VOCs), carbon monoxide (CO), and other harmful gases in power plants, refineries, and chemical manufacturing facilities. It provides long-lasting performance in harsh industrial environments.

4. Fuel Reforming: Employed in steam reforming and partial oxidation processes for hydrogen production. The catalyst’s ability to handle high temperatures and provide stable redox properties makes it ideal for hydrogen production in fuel cells and energy systems.

5. Solid Oxide Fuel Cells (SOFCs): The catalyst’s excellent ionic conductivity and phase stability make it suitable for use in buffer layers or support materials in SOFCs, where it aids in the efficient generation of electricity from hydrogen or other fuels.

6. Oxygen and Gas Sensors: Used in oxygen sensing applications where rapid and reversible oxygen exchange is necessary for real-time detection and monitoring of gases, particularly in automotive and industrial systems.

Cerium-Zirconium-Yttrium Catalyst 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-Yttrium Catalyst FAQs

Q1. What is Cerium-Zirconium-Yttrium Catalyst used for?

This catalyst is primarily used in automotive catalytic converters, emission control systems, fuel reforming processes, solid oxide fuel cells (SOFCs), and industrial gas treatment due to its excellent redox properties, oxygen storage capacity, and thermal stability.

Q2. What makes this catalyst effective in automotive applications?

The catalyst’s ability to store and release oxygen efficiently through redox cycles allows it to maintain optimal air-fuel ratios during lean and rich cycles in three-way catalytic converters, helping reduce harmful emissions like CO, NOₓ, and hydrocarbons.

Q3. How does this catalyst improve emission control in industrial applications?

It reduces volatile organic compounds (VOCs), carbon monoxide, and other toxic gases in industrial environments. Its resistance to high temperatures and sintering ensures stable, long-term performance in harsh conditions.

Performance Comparison Table with Competitive Products

Related Information

1.       Common Preparation Methods

The Cerium-Zirconium-Yttrium Catalyst (58.5CeO₂-33.5Zr(Hf)O₂-8Y₂O₃) is typically synthesized using the co-precipitation method. In this process, aqueous solutions of cerium nitrate (Ce(NO₃)₃), zirconium salts (such as zirconium chloride or zirconium nitrate), and yttrium nitrate (Y(NO₃)₃) are mixed in the desired stoichiometric proportions. A precipitating agent, such as ammonium hydroxide (NH₄OH) or oxalic acid (H₂C₂O₄), is slowly added to the solution under constant stirring to induce the formation of mixed hydroxides or oxalates. The resulting precipitate is aged to improve uniformity and crystallinity. After aging, the precipitate is filtered, thoroughly washed with deionized water to remove excess salts and impurities, and then dried at moderate temperatures (typically between 100°C and 120°C). The dried precursor is then calcined at a high temperature, usually between 500°C and 800°C, to convert it into the desired mixed oxide phase. This calcination step promotes the formation of a homogeneous solid solution, which enhances the catalyst's surface area, redox properties, and thermal stability. The final product is a fine powder with excellent oxygen storage capacity and sintering resistance, making it suitable for catalytic applications, particularly in automotive emission control and industrial processes.