The industrial implementation of aerobic propylene epoxidation remains elusive due to poor selectivity. While many catalysts and reaction conditions have been studied for this transformation, there is a lack of complete kinetic and mechanistic studies that address the complementary and synergistic nature of complex reaction conditions (e.g. inclusion of feed modifiers and catalyst promoters). This work presents a set of kinetic studies on high loading Ag/CaCO3, a widely studied and industrially promising catalyst for aerobic propylene epoxidation. The results yield new insights into the mechanism of Ag catalyzed propylene epoxidation under industrially relevant conditions, specifically the inclusion of catalyst promoters and feed modifiers. The kinetic studies, presented herein, include: the reaction rate dependence on C3H6 and O2, the effects of added CO2 and CO, the inclusion of feed modifiers, and post-synthetic modification using various catalyst promoters. Together, these findings build a better understanding of the complex nature of aerobic propylene epoxidation catalyst systems.

Mechanistic insights on Ag/CaCO3 catalyzed aerobic propylene epoxidation under complex reaction conditions

2019 Spring National Meeting

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