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Oligomerization of ethene on zeolite ZSM-5 type catalysts

机译：乙烯在沸石Zsm-5型催化剂上的低聚反应

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Oligomerization of ethene was performed with zeolite ZSM-5 catalysts. Activity and selectives of the catalysts as a function of reaction temperature in the temperature range 550-750 K were investigated in a microreactor. Some experiments were also performed at temperatures outside this range, and some experiments were performed varying the WHSV (Weight Hourly Space Velocity) and the partial pressure of ethene. A microbalance reactor was used for investigation of the coke formation during reaction. The zeolites were synthesized, and characterized with regard to crystallinity, specific surface area, morphology and chemical composition of the surface and bulk. In addition to HZSM-5, Sm-HZSM-5 and Nb-HZSM-5 were made. All three zeolites were ion-exchanged with nickel, HZSM-5 also with copper. For all the catalysts the ethene conversion increased with increasing reaction temperature until the temperature reached 650-700 K. Further increase of the reaction temperature led to decreased conversion. The decrease in conversion was not due to catalyst deactivation, as decreasing the temperature again, without catalyst regeneration, led to increased conversion. No indications were found for thermodynamic constraints limiting the conversion of ethene at high reaction temperature. A close relation was found between the catalytic stability obtained in the microreactor, and the catalyst weight increase under reaction conditions obtained in the microbalance reactor. This indicates the weight increase to be due, at least partly, to the formation of coke, which deactivated the catalyst. 108 refs., 80 figs., 18 tabs.

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