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The conversion of methanol to olefins ( MTO ) over a heterogeneous nanoporous catalyst material is a highly complex process involving a cascade of elementary reactions .
 Chemical: methanol; Chemical: olefins
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: methanol; Chemical: olefins