8628
Zinc oxide based materials are commonly used for the final desulfurization of synthesis gas in Fischer - Tropsch based XTL processes .
 Chemical: Zinc oxide
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: Zinc oxide 
Answer:
 Chemical: Zinc oxide