Abstract
Two ZSM-5 catalysts were prepared with bulk Si Al ratios of 39 and 74. After conversion to the hydrogen form they were partially deactivated at 370 °C in a methanol/nitrogen stream. Coke contents were determined by combustion in a microbalance. Measurement of the surface and near-surface C Si ratio by X-ray photoelectron spectroscopy showed internal and external coke formation. Internal coke formation predominated during methanol conversion over ZSM-5 until the catalyst was essentially deactivated. External coke was then formed, probably by the thermal cracking of methanol.
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