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 .
 CO, CO, 1 / 2O ( 2 ), CO ( 2 ), alumina
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 CO, CO, 1 / 2O ( 2 ), CO ( 2 ), alumina