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Updated: Aug 5, 2026
06:43
Writing and Low-Temperature Characterization of Oxide Nanostructures
Published on: July 18, 2014
LaMnO3‑Pt Whisker-Structured Cordierite Monoliths for Low-Temperature Soot Oxidation
Zhibo Li1,2,3,4, Hanming Wu1,2, Fengbin Wang1,2
1CATARC Automotive Test Center (Tianjin) Co., Ltd, Tianjin 300300, China.
ACS Omega
|August 1, 2026
Summary
A novel hierarchical catalyst featuring LaMnO3 and Pt significantly enhances low-temperature soot oxidation for diesel particulate filters (DPFs). This durable catalyst design offers improved efficiency for cleaner exhaust emissions.
Area of Science:
- Catalysis
- Materials Science
- Environmental Engineering
Background:
- Diesel particulate filters (DPFs) need highly active and durable catalysts for efficient low-temperature soot oxidation.
- Practical exhaust conditions pose challenges for catalyst performance and longevity.
Purpose of the Study:
- To develop a hierarchically structured LaMnO3-Pt monolithic catalyst for enhanced soot oxidation in DPFs.
- To investigate the effect of whisker-induced structure and synergistic LaMnO3-Pt interaction on catalyst performance.
Main Methods:
- Growing aluminum borate whiskers on cordierite substrate via vapor-phase method.
- Coating with LaMnO3 perovskite and subsequent Pt loading.
- Evaluating soot oxidation performance using temperature-programmed oxidation (TPO) tests.
Main Results:
- The optimized C-LaMnO3-Pt monolithic catalyst achieved significantly lower soot oxidation temperatures (T50 = 453 °C loose, 403 °C tight contact) compared to bare cordierite (T50 = 610 °C).
- The catalyst demonstrated over 99% CO2 selectivity and excellent thermal/structural stability during repeated TPO cycles.
- The hierarchical structure improved catalyst dispersion and soot-catalyst contact efficiency.
Conclusions:
- Hierarchically structured LaMnO3-Pt monolithic catalysts offer a viable strategy for efficient and durable soot oxidation in DPF applications.
- The whisker-induced structure and synergistic metal oxide interaction are key to enhanced catalytic activity and stability.
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