Катализаторы на основе церия-циркония-лантан-цезия 40CeO2-50Zr(Hf)O2-5La2O3-5Pr6O11

Cerium-Zirconium-Lanthanum-Praseodymium Catalyst Description

Cerium-zirconium-lanthanum-praseodymium catalysts (40CeO₂-50Zr(Hf)O₂-5La₂O₃-5Pr₆O₁₁) are advanced mixed oxide catalysts with a highly optimized composition for a variety of catalytic applications, particularly in automotive emission control. These catalysts combine the beneficial properties of cerium, zirconium, lanthanum, and praseodymium, each contributing unique characteristics that enhance overall performance.

Cerium oxide (CeO₂) plays a critical role in oxygen storage and release due to its high oxygen storage capacity (OSC) and redox activity, which allows for efficient catalytic reactions, especially in oxidation processes. Zirconium oxide (ZrO₂), often stabilized with hafnium (Hf) in these formulations, increases thermal stability and resistance to sintering, ensuring the catalyst maintains its active surface area under high-temperature conditions. Lanthanum oxide (La₂O₃) provides improved stability and enhances the catalytic activity of the oxide phase by promoting the formation of a stable solid solution with cerium. Praseodymium oxide (Pr₆O₁₁), as a rare earth element, improves the redox properties of the catalyst and increases resistance to sulfur poisoning, a common issue in automotive exhaust systems.

This unique combination of elements results in a catalyst that exhibits exceptional durability, high thermal stability, enhanced oxygen storage capacity, and superior activity in oxidation and reduction reactions. These properties make cerium-zirconium-lanthanum-praseodymium catalysts ideal for use in automotive catalytic converters, where they effectively reduce harmful emissions such as CO, NOx, and hydrocarbons. They are also used in industrial processes requiring efficient oxidation, such as in the production of specialty chemicals.

Cerium-Zirconium-Lanthanum-Praseodymium Catalyst Applications

1. Automotive Catalytic Converters: These catalysts are most commonly used in automotive emission control systems. They help reduce harmful emissions such as carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons (HC) from internal combustion engine exhaust gases, improving air quality and meeting environmental regulations.

2. Industrial Catalysis: They are used in various industrial catalytic processes that require oxidation or reduction reactions. This includes reactions in chemical manufacturing, particularly in the production of specialty chemicals and petrochemical refining.

3. Hydrogenation and Dehydrogenation Reactions: The catalysts are employed in hydrogenation processes to convert unsaturated compounds into saturated ones and in dehydrogenation processes to remove hydrogen from organic compounds, enhancing efficiency in the chemical industry.

4. Water Gas Shift Reaction: These catalysts are useful in water gas shift reactions for producing hydrogen, which is crucial in fuel cell technology and hydrogen-based energy systems.

5. Fuel Cells: They are used in some types of fuel cells, particularly in the context of improving the oxidation reactions involved in energy production, due to their superior redox properties and oxygen storage capabilities.

6. Pollution Control in Industrial Plants: In addition to automotive applications, these catalysts can be utilized in industrial plants for reducing harmful emissions, especially in processes like power generation or manufacturing, where high-temperature conditions are prevalent.

7. CO Oxidation and NOx Reduction in Gasoline Engines: Used to efficiently oxidize CO and reduce NOx emissions from gasoline-powered engines, contributing to cleaner exhaust systems.

Cerium-Zirconium-Lanthanum-Praseodymium 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-Lanthanum-Praseodymium Catalyst 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

Ce-Zr-La-Pr Catalyst (40CeO₂-50Zr(Hf)O₂-5La₂O₃-5Pr₆O₁₁) vs. Competitive Catalysts

Related Information

1.       Common Preparation Methods

Cerium-zirconium-lanthanum-praseodymium catalysts (40CeO₂-50Zr(Hf)O₂-5La₂O₃-5Pr₆O₁₁) are typically prepared using a co-precipitation method followed by calcination. In a standard process, aqueous solutions containing the nitrates or chlorides of cerium, zirconium (or hafnium), lanthanum, and praseodymium are mixed in stoichiometric ratios. A precipitating agent, such as ammonium hydroxide or oxalic acid, is slowly added under constant stirring to induce the simultaneous precipitation of the mixed hydroxides or oxalates. The resulting precipitate is aged to allow for complete reaction and better crystallinity, then filtered, washed thoroughly to remove residual ions, and dried at moderate temperatures (e.g., 100-120°C). The dried precursor is then calcined at high temperatures, typically between 500-800°C, to form the final mixed oxide catalyst. Calcination facilitates the formation of a homogeneous solid solution with improved surface area, redox properties, and thermal stability. The resulting material is a fine powder with excellent oxygen storage capacity and resistance to sintering, making it highly suitable for use in automotive and industrial catalytic applications.