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Lanthanum Vacancies Modulate Pt Electronic State and Dispersion for Enhanced Toluene Oxidation Over Pt/LaMnO3 Catalysts
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DOI：10.1002/cctc.70907.png)
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Abstract
En 中文
Catalytic oxidation for VOCs abatement with Pt-based catalysts shows excellent low-temperature activity. Rationally optimizing Pt dispersion and regulating its electronic structure are challenging yet promising approaches for highly efficient oxidation catalysts. Here, La vacancies were introduced into the LaMnO3 perovskite via nitric acid etching, serving as anchoring sites for Pt nanoparticles; the resulting catalyst was named Pt/LMO-H. Compared with the Pt/LMO catalyst without La vacancies, the Pt/LMO-H catalyst exhibits significantly improved Pt dispersion and higher electron transfer efficiency from the LaMnO3 to Pt, leading to the formation of electron-rich Pt species and ultimately excellent toluene oxidation performance. In situ DRIFTS and temperature-programmed characterizations reveal that La vacancies not only enhance the catalyst's stability but also construct a temperature-dependent dual mechanism (L-H at low temperatures, while both L-H and MvK apply at high temperatures), which effectively accelerates the rate-determining step, that is, the oxidation of benzoate. This study provides a new paradigm for the design of high-performance perovskite-supported noble metal catalysts.
Keywords:
acid treatment
catalytic oxidation
la vacancies
Pt/LaMnO3
reaction mechanism
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