Abstract
Abstract An upward jump in the conversion of methanol to hydrocarbons on an acid ZSM-5 catalyst is commonly observed at the normal operating temperature when the space velocity is decreased from a high value. The reason is that a substantial dimethylether concentration needs to be established in the system before conversion to hydrocarbons becomes appreciable. The jump is absent when the feed is dimethylether. Such a jump is also observed with ZSM-5 (and not with a relatively wide-pore acid catalyst) when the temperature is increased from a value well below the normal operating temperature. In this case the reason is the onset of cracking of oligomers, which form from small alkenes and remain in the pores at the low temperature, thus unblocking the small pores of the zeolite when the temperature is raised sufficiently. This was demonstrated with a propene feed.The indicated causes are not autocatalytic. The indicated causes are not autocatalytic.
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