Noble-metal alloys are widely used as heterogeneous catalysts. However, due to the existence of scaling properties of adsorption energies on transition metal surfaces, the enhancement of catalytic activity is frequently accompanied by side reactions leading to a reduction in selectivity for the target product. Herein, we describe an approach to breaking the scaling relationship for propane dehydrogenation, an industrially important reaction, by assembling single atom alloys (SAAs), to achieve simultaneous enhancement of propylene selectivity and propane conversion. We synthesize γ-alumina-supported platinum/copper SAA catalysts by incipient wetness co-impregnation method with a high copper to platinum ratio. Single platinum atoms dispersed on copper nanoparticles dramatically enhance the desorption of surface-bounded propylene and prohibit its further dehydrogenation, resulting in high propylene selectivity (~90%). Unlike previous reported SAA applications at low temperatures (<400 °C), Pt/Cu SAA shows excellent stability of more than 120 h of operation under atmospheric pressure at 520 °C.

中文翻译：

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通过热稳定的Pt / Cu单原子合金进行催化脱氢来打破结垢关系。

贵金属合金被广泛用作非均相催化剂。然而，由于过渡金属表面上存在吸附能的结垢性质，催化活性的增强常常伴随有副反应，从而导致对目标产物的选择性降低。在这里，我们描述了一种通过组装单原子合金（SAA）来打破丙烷脱氢的比例关系的方法，丙烷脱氢是一种工业上重要的反应，可以同时提高丙烯的选择性和丙烷的转化率。我们通过高铜对铂比的初湿共浸法合成了γ-氧化铝负载的铂/铜SAA催化剂。分散在铜纳米颗粒上的单个铂原子极大地增强了表面结合的丙烯的解吸并阻止其进一步脱氢，从而导致较高的丙烯选择性（〜90％）。与先前报道的在低温（<400°C）下的SAA应用不同，Pt / Cu SAA在520°C的大气压下显示超过120 h的出色稳定性。