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首页> 外文期刊>RSC Advances >Designing ferrierite-based catalysts with improved properties for skeletal isomerization of n-butene to isobutene
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Designing ferrierite-based catalysts with improved properties for skeletal isomerization of n-butene to isobutene

机译：设计具有改善性能的 n -丁烯骨架异构化为异丁烯的基于镁碱沸石的催化剂

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The crystal morphology and size of ferrierite catalysts were controlled by a suite of crystallization methods and structure-directing agents. In particular, nano-sized ferrierite could be obtained by using tetramethylammonium hydroxide and pyrrolidine as double structure-directing agents under dynamic crystallization. The catalysts were analysed by XRD, SEM, N2 adsorption–desorption, NMR, XRF, NH3-TPD, Py-IR, and TGA, and the characteristics were correlated with their catalytic performance in the skeletal isomerization of n-butene. The results clearly indicated that all the catalysts have a similar crystallinity, Si/Al ratio, and total number of acid sites, while a decrease in their crystal size leads to more pore mouth acid sites. The nano-sized ferrierite showed better stability and higher activity, which were related to their crystal morphology, size, and pore mouth acid. In addition, we further confirmed that high isobutene selectivity can be produced by monomolecular reaction.
机译：镁碱沸石催化剂的晶体形态和尺寸通过一套结晶方法和结构导向剂来控制。特别地，通过在动态结晶下使用四甲基氢氧化铵和吡咯烷作为双结构导向剂，可以获得纳米级镁碱沸石。通过XRD，SEM，N 2 吸附-解吸，NMR，XRF，NH 3 -对催化剂进行了分析。 TPD，Py-IR和TGA及其特性与它们在 n -丁烯的骨架异构化中的催化性能相关。结果清楚地表明，所有催化剂具有相似的结晶度，Si / Al比和酸性位点总数，而其晶体尺寸的减小导致更多的孔口酸性位点。纳米级镁橄榄石表现出更好的稳定性和更高的活性，这与它们的晶体形态，大小和孔口酸有关。另外，我们进一步证实，通过单分子反应可以产生高的异丁烯选择性。

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