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首页> 外文期刊>ACS catalysis >Propane Dehydrogenation over Pt Clusters Localized at the Sn Single-Site in Zeolite Framework
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Propane Dehydrogenation over Pt Clusters Localized at the Sn Single-Site in Zeolite Framework

机译：丙烷脱氢在沸石框架中的Sn单位定位在Sn单位的PT簇上

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Catalytic dehydrogenation of propane over a Pt-based catalyst to propylene has received considerable interests in recent years because this route is able to provide an economical and efficient way to fill the gap between supply and demand in propylene market. The low dispersion of a Pt particle at the support surface and sintering of Pt nanoparticles under the harsh reaction condition are the main challenges in the practical application of this catalyst. Herein, highly efficient Pt/Sn-Beta catalysts are developed for propane dehydrogenation, which exhibits high activity, selectivity, and stability in this reaction. Full characterizations with XRD, STEM, XPS, CO-IR, H-2-TPR, and Py-IR techniques on these catalysts reveal that the Pt clusters are localized at the Sn single-site in the zeolitic framework, which allows the generated Pt clusters to be homogeneously dispersed at the surface zeolite. The high performance of Pt/Sn-Beta catalysts under a high reaction temperature is mainly due to a strong interaction between the Pt cluster and Sn-zeolite. An initial propane conversion of 50%, high propylene selectivity of above 99%, low deactivation rate of 0.006 h(-1) high TOF of 114 s(-1), and good regenerability have been achieved in the Pt-Sn-2.00/Sn-Beta catalyst for propane dehydrogenation at 570 degrees C.
机译：近年来，PT基催化剂对丙烯丙烷催化脱氢在PT基催化剂上对丙烯获得了相当大的利益，因为这条路线能够提供经济有效的方式来填补丙烯市场供需差距。 Pt颗粒在苛刻反应条件下Pt纳米颗粒的载体表面和烧结的低分散性是该催化剂的实际应用中的主要挑战。在此，高效的Pt / Sn-β催化剂是用于丙烷脱氢的丙烷脱氢，其在该反应中具有高活性，选择性和稳定性。这些催化剂上具有XRD，茎，XPS，CO-IR，H-2-TPR和PY-IR技术的全部表征揭示了PT簇在沸石框架中的SN单点定位，这允许产生的PT在表面沸石处均匀分散的簇。 Pt / Sn-β催化剂在高反应温度下的高性能主要是由于Pt簇和Sn-沸石之间的强相互作用。初始丙烷转化率为50％，高丙烯选择性高于99％，低停用速率为0.006小时（-1）高TOF为114 s（-1），并且在PT-SN-2.00中已经实现了良好的再生性/用于570℃的丙烷脱氢的Sn-β催化剂。

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