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Comparison of the behavior of ZnPd near - surface intermetallic phases , unsupported intermetallic ZnPd and supported ZnPd / ZnO catalysts reveals that formaldehyde is formed from methanol in parallel with CO ( 2 ) on the former , while on unsupported intermetallic ZnPd and ZnO - supported ZnPd , it is efficiently reacted toward CO ( 2 ) , thus , a beneficial role of ZnO in oxidizing formaldehyde - derived intermediates toward CO ( 2 ) is evident .
 Chemical: ZnPd; Chemical: ZnPd; Chemical: ZnPd; Chemical: ZnO; Chemical: formaldehyde; Chemical: methanol; Chemical: CO ( 2 ); Chemical: ZnPd; Chemical: ZnO; Chemical: ZnPd; Chemical: CO ( 2 ); Chemical: ZnO; Chemical: formaldehyde; Chemical: CO ( 2 )
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: ZnPd; Chemical: ZnPd; Chemical: ZnPd; Chemical: ZnO; Chemical: formaldehyde; Chemical: methanol; Chemical: CO ( 2 ); Chemical: ZnPd; Chemical: ZnO; Chemical: ZnPd; Chemical: CO ( 2 ); Chemical: ZnO; Chemical: formaldehyde; Chemical: CO ( 2 )