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As a result , a catalyst based on polyvinyl pyrrolidone ( PVP ) / graphene shows better methanol oxidation performance than that based on PVP / reduced graphene oxide .
 Chemical: polyvinyl pyrrolidone; Chemical: PVP; Chemical: graphene; Chemical: methanol; Chemical: PVP; Chemical: graphene oxide
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: polyvinyl pyrrolidone; Chemical: PVP; Chemical: graphene; Chemical: methanol; Chemical: PVP; Chemical: graphene oxide