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The intrinsic catalytic activity of palladium ( Pd ) is significantly enhanced in gold ( Au ) - Pd alloy nanoparticles ( NPs ) under visible light irradiation at ambient temperatures .
 Chemical: palladium; Chemical: Pd; Chemical: Au; Chemical: Pd
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: palladium; Chemical: Pd; Chemical: Au; Chemical: Pd