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Among several typical zeolites, H-ZSM-5 was found to be a promising catalyst for the conversion of methyl halides (CH 3 Cl and CH 3 Br) into propylene. The increase in Si/Al ratio or Na + exchange degree in ZSM-5 increased the selectivity of propylene but decreased the conversion of methyl halides. The treatment of H-ZSM-5 with ammonium fluoride followed by calcination significantly...
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