13105
Catalytic experiments in a batch as well as a flow reactor resulted in highly selective steam reforming , though at low specific activities , of formaldehyde and methanol over ZnO toward CO ( 2 ) ( selectivity of 95 - 99 . 6 % ) .
 Chemical: formaldehyde; Chemical: methanol; Chemical: ZnO; 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: formaldehyde; Chemical: methanol; Chemical: ZnO; Chemical: CO ( 2 )