Каталитические системы на основе церия-циркония-лантана-празеодима (60CeO2-30Zr(Hf)O2-3La2O3-7Pr6O11)

Cerium-Zirconium-Lanthanum-Praseodymium Catalysts Description

Cerium-zirconium-lanthanum-praseodymium catalysts (60CeO₂-30Zr(Hf)O₂-3La₂O₃-7Pr₆O₁₁) are advanced mixed oxides engineered for high-performance catalytic applications, particularly in automotive emission control systems. Their formulation integrates the distinct functionalities of cerium, zirconium, lanthanum, and praseodymium oxides to deliver a synergistic performance in harsh environments.

Cerium oxide (CeO₂) is key to the catalyst’s high oxygen storage and release capacity, enabling rapid redox cycling that is critical for effective exhaust gas treatment. Zirconium oxide (ZrO₂), often co-doped with hafnium, reinforces the thermal stability of the material and minimizes sintering at elevated temperatures, helping to preserve 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), meanwhile, enhances redox activity and adds resistance to sulfur poisoning, which is essential for long-term operation in real-world exhaust conditions.

Together, these oxides form a catalyst with excellent thermal durability, strong oxygen storage capability, and efficient performance in both oxidation and reduction reactions. As a result, these materials are widely used in three-way catalytic converters to reduce emissions of CO, NOₓ, and hydrocarbons. They are also applicable in industrial oxidation processes, where high redox performance and stability are required.

Cerium-Zirconium-Lanthanum-Praseodymium Catalysts Applications

1. Automotive Emission Systems: These catalysts are primarily utilized in vehicle exhaust treatment systems, where they convert harmful gases like carbon monoxide (CO), nitrogen oxides (NOₓ), and unburned hydrocarbons (HC) into less toxic substances, supporting compliance with environmental emission standards.

2. Industrial Catalytic Processes: Applied in diverse industrial sectors, these materials facilitate key oxidation and reduction reactions, especially in chemical synthesis and refining operations such as petrochemical processing and specialty chemical production.

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

4. Water-Gas Shift Catalysis: They play a role in hydrogen generation by catalyzing the water-gas shift reaction, which is critical in hydrogen production for fuel cells and hydrogen energy infrastructure.

5. Fuel Cell Integration: Thanks to their excellent redox behavior and oxygen buffering capacity, these catalysts support oxidation processes within certain fuel cell systems, improving overall energy conversion performance.

6. Industrial Emission Reduction: Beyond automotive uses, these catalysts are effective in curbing emissions from high-temperature industrial operations, such as those found in power plants and heavy manufacturing.

7. CO and NOx Control in Gasoline Engines: Designed to oxidize carbon monoxide and reduce nitrogen oxides in the exhaust of gasoline engines, these catalysts contribute to more environmentally friendly engine emissions.

Cerium-Zirconium-Lanthanum-Praseodymium 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-Praseodymium Catalysts FAQs

Q1. What makes these catalysts special?

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 gives them superior performance.

Q2. What are the main applications of these catalysts?

They are primarily used in automotive catalytic converters to reduce emissions like CO, NOx, and hydrocarbons. They also have industrial applications in hydrogenation, dehydrogenation, and other oxidation-reduction processes.

Q3. Why are these catalysts important for automotive use?

These catalysts are crucial in reducing the 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 Table with Competitive Products

Related Information

1.       Common Preparation Methods

Cerium-zirconium-lanthanum-praseodymium catalysts (60CeO₂-30Zr(Hf)O₂-3La₂O₃-7Pr₆O₁₁) are commonly synthesized through a co-precipitation approach followed by thermal treatment. In this process, aqueous solutions of cerium, zirconium (or hafnium), lanthanum, and praseodymium salts—typically nitrates or chlorides—are blended in precise stoichiometric proportions. A precipitating agent, such as ammonium hydroxide or oxalic acid, is gradually introduced under continuous stirring to ensure uniform precipitation of the corresponding hydroxides or oxalates. The formed precipitate is then aged to promote phase homogeneity and crystallinity, followed by filtration and thorough washing to eliminate residual ions. After drying the filtered solid at moderate temperatures (typically 100-120°C), it undergoes calcination at elevated temperatures (generally 500-800°C). This heat treatment induces the formation of a stable, well-dispersed mixed oxide phase with enhanced surface area, thermal resistance, and redox performance. The final product is a fine, thermally robust powder with excellent oxygen storage capacity and resistance to sintering, making it particularly well-suited for catalytic applications in automotive exhaust systems and industrial emission control.