کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
50330 | 46790 | 2013 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Olefin impurity effect on n-pentane bimolecular isomerization over WOx/ZrO2 Olefin impurity effect on n-pentane bimolecular isomerization over WOx/ZrO2](/preview/png/50330.png)
Depending on the catalyst used, the reaction conditions and the molecules converted, alkane isomerization proceeds via a monomolecular or a bimolecular mechanism. n-Pentane isomerizes via both mechanisms which makes it an excellent probe molecule. In this study, n-pentane isomerization was investigated using WOx/ZrO2. Propylene and 1-pentene were co-fed separately to study the effect on n-pentane isomerization and it was identified that only 1-pentene increases the isomerization selectivity to isopentane. Our results support the model of a bimolecular mechanism that proceeds via a C10 intermediate on Zr-WOx Brønsted sites.
► Isomerization activity increases when olefins are co-fed with pentane.
► High olefin concentration increases activity but promotes coke formation.
► Propylene traces promote only the formation of isobutane and C4 olefins.
► The induction period is critical for the formation of C5+ species.
► The bimolecular isomerization mechanism over WOx/ZrO2 is the dominant pathway.
Journal: Catalysis Communications - Volume 32, 5 February 2013, Pages 5–10