The oxidative dehydrogenation of C₃H₈ to C₃H₆ using CO₂ is an attractive alternative to nonoxidative propane dehydrogenation and facilitates the utilization of CO₂. The activity of supported nanoparticles for this reaction has been extensively investigated, but the often-overlooked deleterious formation of CO via reforming reactions remains a challenge with these catalysts. In this paper, we investigate the origin of CO formation over supported nanoparticle catalysts and find that the support and metal both play a role in favoring the formation of either CO or C₃H₆. Reducible supports are associated with higher activity and increased CO formation, but nonreducible supports also facilitate CO formation. Supported Pt catalysts were more selective toward C₃H₆ than Pd analogues, but both catalysts favored coke formation. These findings highlight the need for careful catalyst design in supported nanoparticle catalysts for the oxidative dehydrogenation of propane using carbon dioxide, particularly with respect to tuning catalyst selectivity.

中文翻译：

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使用二氧化碳氧化丙烷脱氢过程中一氧化碳形成的起源


使用 CO ₂ 将 C ₃ H ₈ 氧化脱氢为 C ₃ H ₆ 是一种有吸引力的替代方案丙烷非氧化脱氢，有利于CO ₂ 的利用。负载纳米颗粒在该反应中的活性已被广泛研究，但经常被忽视的通过重整反应形成有害的 CO 仍然是这些催化剂的挑战。在本文中，我们研究了负载型纳米颗粒催化剂上 CO 形成的起源，发现载体和金属都在有利于 CO 或 C ₃ H ₆ 的形成方面发挥着作用。 。可还原的载体与较高的活性和增加的 CO 形成相关，但不可还原的载体也促进 CO 的形成。负载型 Pt 催化剂比 Pd 类似物对 C ₃ H ₆ 的选择性更高，但这两种催化剂都有利于焦炭的形成。这些发现强调了在使用二氧化碳进行丙烷氧化脱氢的负载型纳米颗粒催化剂中需要仔细设计催化剂，特别是在调整催化剂选择性方面。