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Demonstrates improved soot oxidation in low-temperature conditions, suggesting better DPF performance.
High Resolution Image Download MS PowerPoint Slide Diesel particulate filters (DPFs) require catalysts with both high activity and durability to achieve efficient low-temperature soot oxidation under practical exhaust conditions. In this work, a hierarchically structured LaMnO 3 –Pt monolithic catalyst was constructed by growing aluminum borate whiskers on a cordierite substrate via a vapor-phase method to form a biomimetic tufted layer, followed by coating with LaMnO 3 perovskite and subsequent Pt loading. The whisker-induced structure significantly improves catalyst dispersion and soot–catalyst contact efficiency, while the synergistic interaction between LaMnO 3 and Pt effectively regulates surface oxygen species and their migration behavior. Temperature-programmed oxidation (TPO) tests demonstrate that the optimized C-LaMnO 3 –Pt 0.9 wt % monolithic catalyst exhibits outstanding soot oxidation performance, with half-conversion temperature (T 50 ) reduced to 453 °C (under loose contact) and 403 °C (under tight contact), respectively, which are significantly lower than those of bare cordierite (T 50 = 610 °C). In addition, the catalyst maintains a CO 2 selectivity exceeding 99% during soot oxidation and shows no obvious activity degradation during repeated TPO cycles, indicating excellent thermal and structural stability. This hierarchical structural design provides a viable strategy for developing efficient and durable monolithic catalysts for soot oxidation in DPF applications.
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Li et al. (2026) studied this question.
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