1. Chemical properties
Chemical formula: The chemical formulas of palladium oxide are mainly PdO and PdO₂.
Color: PdO is usually a black or brown solid, while PdO₂ is black.
2. Preparation method
Direct combustion: Palladium oxide can be directly obtained by heating palladium metal in oxygen.
Oxidation reaction: It can also be obtained by the reaction of hydrogen and oxygen.
[\text{2Pd} + \text{O}_2 \rightarrow \text{2PdO}]
 

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3. Uses
Catalysts: Palladium oxide is widely used as a catalyst, especially in organic chemical reactions such as hydrogenation, dehydrogenation and oxidation.
Electronic materials: In the semiconductor industry, palladium oxide is used for thin film growth and electrocatalysis.
Hydrogen storage: Due to its adsorption properties for hydrogen, palladium oxide can be used for hydrogen storage and separation.
4. Safety and handling
Toxicity: Palladium oxide has low toxicity, but long-term inhalation of its dust or direct contact with skin and eyes should still be avoided.
Handling and storage: It should be stored in a sealed container in a dry and cool place, away from light and humidity.
5. Physical properties
Melting point: The melting point of PdO is about 650°C.
Solubility: Palladium oxide is insoluble in water, but it can be dissolved in strong acids such as concentrated nitric acid.
6. Application Examples
Organic synthesis: Palladium oxide is used as a catalyst to synthesize complex organic molecules in cross-coupling reactions such as Suzuki reaction and Stille reaction.
Electrocatalyst: Used in electrochemical devices such as batteries and fuel cells to promote electrochemical reactions.