| 摘要 |
<p>Propylene and ethylene are made by heating one or more C4 to C9 olefins with a zeolite catalyst that has a pore diameter within the range of 4.4 to 4.5 Å and one-dimensional, non-interconnecting channels having a pore size index within the range of 23 to 25. Preferred zeolites are TON and MTT. The process affords high olefin conversions and excellent selectivities to ethylene and propylene. Because catalyst lifetime is long, especially when the catalyst is steam treated, a fixed-bed process can be used. Higher olefins, usually the major by-products, are recycled to further boost ultimate conversion.</p> |
