Co-based catalysts are promising alternatives to replace Pt- and Cr-based catalysts for propane dehydrogenation (PDH) in view of the catalytic activity for C–H bond activation, low cost, and low toxicity. However, the reduction of unstable CoO_x species and coke deposition cause serious catalyst deactivation. In this work, a sheet-shaped Co–Al₂O₃ catalyst comprising of isolate Co²⁺ sites shows a high intrinsic activity (specific reaction rate > 16 mmol g⁻¹ h⁻¹) and catalytic stability in highly selective PDH reaction (>97% C₃H₆ selectivity). Extensive characterization demonstrates that the tetrahedral Co²⁺ isolated site is stabilized by the γ-Al₂O₃ matrix, facilitating propylene desorption to inhibit formation of coke and other byproducts and to free the active Co sites.

考虑到C–H键活化的催化活性，低成本和低毒性，Co基催化剂是替代Pt和Cr基催化剂进行丙烷脱氢（PDH）的有前途的替代品。但是，不稳定的CoO _x物种的减少和焦炭沉积会导致严重的催化剂失活。在这项工作中，由分离的Co ²⁺位点组成的片状Co-Al ₂ O ₃催化剂表现出高的固有活性（比反应速率> 16 mmol g ^-1 h ^-1）和在高选择性PDH反应中的催化稳定性（ > 97％的C ₃ H ₆选择性）。广泛的表征表明，四面体Co ²⁺分离的位点通过γ- Al ₂ O ₃基质稳定，有助于丙烯解吸，从而抑制焦炭和其他副产物的形成，并释放出活性的Co位点。