11588
Chemisorption of an appropriate amount of polyvinylpyrrolidone on the Au / SiO ( 2 ) catalyst greatly enhances the benzaldehyde selectivity from 43 % to ~ 100 % and its yield from 4 . 9 % to 7 . 2 % .
 Chemical: polyvinylpyrrolidone; Chemical: Au; Chemical: SiO ( 2 ); Chemical: benzaldehyde
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: polyvinylpyrrolidone; Chemical: Au; Chemical: SiO ( 2 ); Chemical: benzaldehyde