Growing demand of short chain olefins such as propylene for plastic production drives the development of high performing catalysts for propane dehydrogenation (PDH). Here, a confinement strategy originating from metal-sulfur clusters was employed to fabricate defective MoPtSx phase via anchoring by coordinatively unsaturated Al sites present on alumina, followed by reduction under H2 flow at high temperature. This catalyst with a low Pt content exhibits great ability for C–H activation with high intrinsic activity and facile propylene desorption in PDH reaction. More importantly, this catalyst shows excellent stability during long-term tests with both stable conversion and selectivity. Through combined X-ray absorption spectroscopy, electron microscopy and electron paramagnetic resonance measurements it could be affirmed that the isolated and electron-enriched Pt sites as well as their proximity to adjacent sulfur vacancies is vital for the first and second C–H bond activation, and suppressing of C–C cleavage which otherwise lead to coking.

中文翻译：

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立方体钼硫团簇作为构建新型丙烷脱氢催化剂的平台


塑料生产对丙烯等短链烯烃的需求不断增长，推动了高性能丙烷脱氢 （PDH） 催化剂的开发。在这里，采用源自金属硫簇的限制策略，通过氧化铝上存在的配位不饱和 Al 位点锚定来制造有缺陷的 MoPtSx 相，然后在高温下在 H2 流动下还原。这种低 Pt 含量的催化剂在 PDH 反应中表现出强大的 C-H 活化能力、高本征活性和简单的丙烯解吸。更重要的是，这种催化剂在长期测试中表现出优异的稳定性，具有稳定的转化率和选择性。通过结合 X 射线吸收光谱、电子显微镜和电子顺磁共振测量，可以确定分离和富电子的 Pt 位点以及它们与相邻硫空位的接近程度对于第一和第二 C-H 键激活和抑制 C-C 裂解至关重要，否则会导致焦化。