Propane dehydrogenation (PDH) is a commercial propylene production technology that has received much attention, but high reaction temperatures result in a decrease of propylene selectivity and catalyst stability. This paper describes a single-site [PtZn₄] catalyst by assembling atomically ordered intermetallic alloy (IMA) as a selective and ultrastable PDH catalyst. The catalyst enables more than 95% of propylene selectivity from 520°C to 620°C. No obvious deactivation is observed within the 160-h test, superior to PtSn/Al₂O₃ and state-of-the-art Pt-based catalysts. Based on in situ X-ray absorption fine structure, X-ray photoelectron spectroscopy measurements, and density functional theory calculations, we reveal that the surface [PtZn₄] ensembles in PtZn IMAs serve as the key active site structures, wherein the geometry-isolated and electron-rich Pt₁ site in [PtZn₄] ensembles readily promotes the first and second C–H cleavage of propane but inhibits further dehydrogenation of surface-bounded propylene. This significantly improves the selectivity and stability by prohibiting coke side reactions.

丙烷脱氢（PDH）是一种商业化的丙烯生产技术，受到了广泛的关注，但是较高的反应温度导致丙烯选择性和催化剂稳定性下降。本文通过组装原子序金属间合金（IMA）作为选择性和超稳定的PDH催化剂，描述了一种单中心[PtZn ₄ ]催化剂。该催化剂在520°C至620°C范围内可实现超过95％的丙烯选择性。在160小时的测试中，没有观察到明显的失活，优于PtSn / Al ₂ O ₃和最先进的Pt基催化剂。基于原位通过X射线吸收精细结构，X射线光电子能谱测量和密度泛函理论计算，我们发现PtZn IMA中的表面[PtZn ₄ ]集合是关键的活性位点结构，其中几何隔离且电子富集[PtZn ₄ ]中的Pt ₁位点容易促进丙烷的第一次和第二次CH裂解，但抑制了表面结合的丙烯的进一步脱氢。通过阻止焦炭副反应，这显着提高了选择性和稳定性。