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Propylene, a key building block in the chemical industry, can be produced via CO2-assisted oxidative dehydrogenation of propane. However, catalyst deactivation caused by sintering and coke deposition remains a major challenge. Herein, a series of high-entropy intermetallic catalysts with the composition (Pt0.33CoxNi0.67−x)(SnyIn1−y)/CeO2 was developed, in which the configurational entropy and element-specific chemical effects were systematically tuned. The catalyst with x = 0.40 and y = 0.57 exhibits higher net C3H6 selectivity and a catalyst lifetime twice as long as that of the equiatomic counterpart. A positive correlation between configurational entropy and nanoparticle dispersion was observed, quantitatively demonstrating entropy-induced suppression of particle sintering. Kinetic analysis further distinguishes the respective contributions of entropy-driven physical stabilization and element-specific chemical effects to catalyst stability. These results indicate that non-equiatomic compositional tuning provides a strategy for enhancing the performance of high-entropy catalysts, contributing to the rational design of catalysts based on high-entropy materials.
Zhang et al. (Mon,) studied this question.