Cerium-Zirconium-Lanthanum-Praseodymium Catalyst Specifications

Properties

Note: Product information is based on theoretical data. For specific requirements and detailed inquiries, please contact us.

Product Description

Cerium-Zirconium-Lanthanum-Praseodymium Catalyst (60CeO₂-30Zr(Hf)O₂-3La₂O₃-7Pr₆O₁₁) from SMC is an advanced mixed oxide engineered for high-performance catalytic applications, particularly in automotive emission control systems. This catalyst combines the unique functionalities of cerium, zirconium, lanthanum, and praseodymium oxides to deliver synergistic performance in harsh environments.

Key Components

• Cerium Oxide (CeO₂): Central to the catalyst’s high oxygen storage and release capacity, facilitating rapid redox cycling essential for effective exhaust gas treatment.
• Zirconium/Hafnium Oxide (Zr(Hf)O₂): Enhances thermal stability and minimizes sintering at elevated temperatures, preserving the catalyst’s surface area.
• Lanthanum Oxide (La₂O₃): Supports the formation of a stable solid solution with ceria, improving structural integrity and boosting overall catalytic efficiency.
• Praseodymium Oxide (Pr₆O₁₁): Enhances redox activity and provides resistance to sulfur poisoning, ensuring long-term performance in real-world exhaust conditions.

These components work together to create a catalyst with excellent thermal durability, strong oxygen storage capability, and efficient performance in both oxidation and reduction reactions. This makes the catalyst ideal for use in three-way catalytic converters, hydrogen production, and various industrial oxidation processes, ensuring performance stability and longevity in severe thermal environments.

Applications

1. Automotive Emission Systems:
   Primarily utilized in vehicle exhaust treatment systems to convert harmful gases like carbon monoxide (CO), nitrogen oxides (NOₓ), and unburned hydrocarbons (HC) into less toxic substances, aiding compliance with environmental emission standards.

2. Industrial Catalytic Processes:
   Facilitates key oxidation and reduction reactions in diverse industrial sectors, including chemical synthesis, petrochemical processing, and specialty chemical production.

3. Hydrogenation/Dehydrogenation Applications:
   Enhances the efficiency of converting unsaturated hydrocarbons to saturated ones (hydrogenation) and removing hydrogen atoms from organic molecules (dehydrogenation), widely used in fine chemical manufacturing.

4. Water-Gas Shift Catalysis:
   Plays a crucial role in hydrogen generation by catalyzing the water-gas shift reaction, essential for hydrogen production in fuel cells and hydrogen energy infrastructure.

5. Fuel Cell Integration:
   Supports oxidation processes within certain fuel cell systems due to excellent redox behavior and oxygen buffering capacity, improving overall energy conversion performance.

6. Industrial Emission Reduction:
   Effective in curbing emissions from high-temperature industrial operations, such as those in power plants and heavy manufacturing facilities.

7. CO and NOₓ Control in Gasoline Engines:
   Designed to oxidize carbon monoxide and reduce nitrogen oxides in gasoline engine exhausts, contributing to more environmentally friendly engine emissions.

Packaging

SMC ensures secure and customized packaging tailored to the product dimensions:

• Small Items:
  Packed in durable PP (polypropylene) boxes.

• Large Items:
  Placed in custom wooden crates for optimal protection.

Packaging Options:

• Carton
• Wooden Box
• Customized Packaging Solutions

For special packaging requirements, please contact us.

Manufacturing Process

Testing Methods

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 like scratches, cracks, or inclusions through visual and ultrasonic examination.

5. Hardness Testing:
   Determines material hardness to confirm uniformity and mechanical reliability.

For detailed testing procedures, refer to SMC's testing protocols.

FAQs

Q1. What makes these catalysts special?
A: Their high oxygen storage capacity (OSC) and ability to undergo redox reactions make them effective for oxidation and reduction processes. The combination of cerium for oxygen storage, zirconium for stability, and lanthanum and praseodymium for enhanced redox properties results in superior performance.

Q2. What are the main applications of these catalysts?
A: They are primarily used in automotive catalytic converters to reduce emissions like CO, NOₓ, and hydrocarbons. Additionally, they have industrial applications in hydrogenation, dehydrogenation, and other oxidation-reduction processes.

Q3. Why are these catalysts important for automotive use?
A: These catalysts are crucial in reducing harmful emissions from internal combustion engines, helping vehicles meet stringent environmental standards. They efficiently convert toxic gases like carbon monoxide and nitrogen oxides into less harmful substances.

Performance Comparison with Competitive Products

Additional Information

Common Preparation Methods

Cerium-Zirconium-Lanthanum-Praseodymium Catalysts (60CeO₂-30Zr(Hf)O₂-3La₂O₃-7Pr₆O₁₁) are commonly synthesized through a co-precipitation method followed by thermal treatment. The process involves the following steps:

1. Preparation of Aqueous Solutions:
   Combine aqueous solutions of cerium, zirconium (or hafnium), lanthanum, and praseodymium salts—typically nitrates or chlorides—in precise stoichiometric proportions.

2. Addition of Precipitating Agent:
   Gradually introduce a precipitating agent such as ammonium hydroxide or oxalic acid under continuous stirring to ensure uniform precipitation of the corresponding hydroxides or carbonates.

3. Precipitation:
   Allow the mixture to form a homogeneous gel or precipitate of mixed hydroxides/carbonates.

4. Aging:
   Age the precipitate to enhance phase homogeneity and crystallinity.

5. Filtration and Washing:
   Filter and thoroughly wash the aged precipitate to remove residual ions and impurities.

6. Drying:
   Dry the washed precursor at moderate temperatures (typically 100-120°C) to eliminate moisture.

7. Calcination:
   Calcine the dried precursor at elevated temperatures (generally 500°C - 800°C) to obtain the final mixed oxide with the desired crystal structure and properties.

This synthesis process ensures a catalyst with high surface area, strong redox behavior, and excellent thermal stability, making it ideal for emission control technologies and other demanding catalytic environments.