Exploration of regeneration process in Pt-Ga catalysts supported on alumina for propane dehydrogenation

Propane dehydrogenation (PDH) is one of the main industrial processes to produce propene. Notably, catalysts for PDH reaction require constant regeneration because of fast catalyst deactivation due to coking and sintering. In that context, we have found that Pt-Ga bimetallic systems supported on Si-doped alumina displays enhanced activity and stability for PDH compared to monometallic Pt systems supported on alumina. In order to understand the difference between "good” and “bad” catalysts depending on the surface dopants and additives, we plan to carry out in-situ and operando XAS studies during PDH and subsequent regeneration tests using a series of Pt-Ga systems with tailored surface sites as model catalysts prepared via surface organometallic chemistry (SOMC). Repeating the cycles of PDH and regeneration will allow us to identify the roles of dopants and additives on catalyst productivity and stability by amplifying the spectra differences.

丙烷脱氢（Propane Dehydrogenation, PDH）是工业生产丙烯的核心工艺之一。鉴于结焦与烧结会导致催化剂快速失活，PDH反应催化剂需进行持续再生。在此研究背景下，我们发现负载于硅掺杂氧化铝载体的Pt-Ga双金属体系，相较于负载于纯氧化铝载体的单金属Pt体系，展现出更优异的PDH催化活性与稳定性。为厘清基于表面掺杂剂与助剂的“优质”与“劣质”催化剂之间的性能差异，我们计划采用通过表面有机金属化学（Surface Organometallic Chemistry, SOMC）制备的一系列具有定制化表面位点的Pt-Ga体系作为模型催化剂，在PDH反应及后续再生测试过程中开展原位与operando X射线吸收光谱（X-ray Absorption Spectroscopy, XAS）研究。通过重复PDH与再生循环，我们将放大光谱差异，从而阐明掺杂剂与助剂对催化剂生产性能与稳定性的作用机制。