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The Au / Pd molar ratio of the alloy NPs has an important impact on performance of the catalysts since it determines both the electronic heterogeneity and the distribution of Pd sites at the NP surface , with these two factors playing key roles in the catalytic activity .
 Chemical: Au; Chemical: Pd; 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: Au; Chemical: Pd; Chemical: Pd