, Volume 20, Issue 3-4, pp 329-336

On the reaction mechanism for propene formation in the MTO reaction over SAPO-34

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Three different feeds: methanol, methanol/ethanol/water (2 ∶ 1 ∶ 1 molar ratio) and13C-methanol/ethanol/water (2 ∶ 1 ∶ 1) have been converted to hydrocarbons over a SAPO-34 catalyst at 420 °C using argon carrier gas. The products were analyzed by GC-MS allowing the determination of the isotopic composition of the reaction products. The experiments show that the majority of the propene molecules are formed directly from methanol, and that only a minor part is formed by methylation of ethene.