Direct Conversion of Ethene to Propene and Butenesover Medium Pore Zeolites(PPT)

摘要

1. Selective conversion of ethene to propene and butenes is mainly influenced by spatial constraints of the pore structures. 2. Among all zeolite tested in this work, one-dimensional pore structures such as HZSM-22 and HZSM-23 possess the highest selectivities to propene and butenes at moderate conversion rates. 3. The strong deactivation behavior during the conversion of ethene needs a continuous regeneration of the zeolite catalyst which is - as demonstrated for HZSM-23 - in principally possible. 4. A strong influence of Al - content on the selectivities to light olefins was observed. Lowering the Al - content in three-dimensional pore structures leads to an increasing selectivity to propene whereas a decrease was observed for one-dimensional pore structures.