کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4758133 | 1420404 | 2018 | 8 صفحه PDF | دانلود رایگان |

- Adjusting ZSM-5 acidity by loading 10 wt% Cu or La through wet impregnation method, separately.
- Manipulating the structural properties of ZSM-5 by treating with 0.2Â M NaOH solution.
- Using modifications sequentially, IDS (Impregnation-Desilication sequence) and DIS (Desilication-Impregnation Sequence).
- Discussing the contribution of each three possible mechanisms in Propane catalytic cracking.
ZSM-5 was subjected to two different modifications, namely mesopore creation with 0.2Â m NaOH and metal impregnation with 10Â wt% of La or Cu, with particular emphasis on the sequence of these modifications. Alkali treatment of ZSM-5 led to extraction of silica and alumina, resulted in loss of strong acid sites, and enhanced accessibility. Furthermore, acidity could be regulated by impregnation with metals. High olefin selectivity (68%), optimal propylene to ethylene ratio (P/EÂ =Â 1.20), and reasonable stability were obtained over a catalyst produced by a Desilication-Impregnation Sequence (DIS) (AT-10La-ZSM-5). Modification of ZSM-5 by reverse Impregnation-Desilication Sequence (IDS) decreased selectivity, considerably. The modification sequence thus appears to be a key factor in determining the product distribution, and we propose that it may provide a facile new method to control the reaction path.
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Journal: Microporous and Mesoporous Materials - Volume 255, 1 January 2018, Pages 253-260