Propane dehydrogenation (PDH) is one of the most effective methods to produce propylene. But the industrial Pt-based catalysts often suffer from short-term stability under the high temperature reaction environment (500–700°C) via sintering and coke deposition. Herein, stable PDH reaction in high propylene yield has been achieved by the confinement of Pt–Zn intermetallic alloys (IMAs) in the channels of silicalite-1. Single-site Zn in the MFI framework was found to play a key role on assisting and stabilizing the PtZn IMAs for efficient PDH. By the cooperative action of the spatial confined PtZn IMAs and the lattice confined framework Zn, high propylene selectivity (>99%) without obvious deactivation was realized on the as-developed catalyst (PtZn@S-1) under 600°C even after 90 h. The low deactivation constant (0.003 h⁻¹) was 6 times lower than that of the industrial PtSn catalyst.

中文翻译：

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PtZn金属间化合物纳米合金包封在silicalite-1中用于丙烷脱氢

丙烷脱氢（PDH）是生产丙烯最有效的方法之一。但是工业铂基催化剂在高温反应环境（500-700°C）下经常因烧结和积炭而受到短期稳定性的影响。在此，通过将 Pt-Zn 金属间合金 (IMAs) 限制在硅沸石-1 的通道中，实现了高丙烯产率的稳定 PDH 反应。发现 MFI 框架中的单点 Zn 在辅助和稳定 PtZn IMA 以实现高效 PDH 方面发挥关键作用。通过空间限制的 PtZn IMA 和晶格限制框架 Zn 的协同作用，在 600°C 下甚至在 90°C 后，所开发的催化剂（PtZn@S-1）实现了高丙烯选择性（> 99%）且没有明显失活H。低失活常数 (0.003 h ^-1) 比工业 PtSn 催化剂低 6 倍。