Ethanol transformation into higher hydrocarbons over HZSM-5 zeolite: Direct detection of radical species by in situ EPR spectroscopy
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- 作者：Karima Ben Tayeb ; Ludovic Pinard ; Nadia Touati ; Herv¨¦ Vezin ; Sylvie Maury ; Olivier Delpoux
- 关键词：Brø ; nsted acidity ; Coke composition ; In situ EPR ; Radicals ; Zeolite ; Ethylene oligomerization
- 刊名：Catalysis Communications
- 出版年：2012
- 出版时间：5 October, 2012
- 年：2012
- 卷：27
- 期：Complete
- 页码：119-123
- 全文大小：492 K
文摘
HZSM-5 (Si/Al ratio = 40) zeolite is an efficient catalyst for ethanol transformation due to its capacity to maintain a high activity in C3 + hydrocarbons formation with time-on-stream (TOS) and this in spite of a great loss of acidity and microporosity and a high coke content deposited inside the pores of the zeolite. A study by in situ Electron Paramagnetic Resonance (EPR) spectroscopy in ethylene conversion to hydrocarbons showed that a fraction of radicals was active.