Oligomerization of Light Olefins to Gasoline: An Advanced NMR Characterization of Liquid Products

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• 作者：Christopher P. Nicholas ; Linda Laipert ; Sesh Prabhakar
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：August 31, 2016
• 年：2016
• 卷：55
• 期：34
• 页码：9140-9146
• 全文大小：403K
• 年卷期：0
• ISSN：1520-5045

文摘

Using multiple ¹H and ¹³C NMR spectroscopic techniques, we have investigated the C8 cut from samples of liquid products obtained by the oligomerization of light olefins over solid phosphoric acid (SPA) and MTW zeolite. The carbon species present, CH_n (n = 0–3), were identified by DEPT NMR and quantified using inverse-gated decoupled ¹³C NMR spectra. The olefinic protons and carbons as well as the types of olefins were quantified. ¹³C NMR shows that the amount of methyl carbons is similar for both catalysts but that methylene and methyne carbon distributions are different. The product obtained over MTW catalyst showed higher quantities of quaternary olefins, likely from type V tetrasubstituted olefins, compared to that over SPA catalyst. In addition, 2D NMR has also been attempted to understand the proton and carbon connectivities and confirmed the presence of type I and II olefins.