11413
We compared the catalytic activity of the two types of NCs in the CO oxidation reaction ( CO + 1 / 2O ( 2 ) --> CO ( 2 ) ) , after they had been dispersed on an alumina nanopowder support .
 Chemical: CO; Chemical: CO; Chemical: 1 / 2O ( 2 ); Chemical: CO ( 2 ); Chemical: alumina
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: CO, CO, 1 / 2O ( 2 ), CO ( 2 ), alumina 
Answer:
 Chemical: CO; Chemical: CO; Chemical: 1 / 2O ( 2 ); Chemical: CO ( 2 ); Chemical: alumina