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Cu/Mn Oxidation Catalyst Integration into Recycled Carbon Fiber-Based Filter for Diesel Soot Emission Control

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Abstract:

Diesel vehicle emissions containing nitrogen oxides, volatile organic compounds, and soot pose significant health and environmental risks. Diesel particulate filters (DPFs) reduce soot emissions by capturing particulate matter through their porous structure, but are often made from costly materials like silicon carbide and cordierite. This study addresses this gap by developing a DPF using recycled carbon fibers (CF) coupled with bentonite-supported copper-manganese (Cu/Mn) catalysts. CFs were recovered from polymer composite wastes using two distinct approaches: a two-step pyrolysis involving thermal decomposition and oxidation of resin, and a chemical treatment via acid digestion and catalyzed separation. These processes yielded clean, structurally intact fibers suitable for filter fabrication. Sintering the filter produced a composite with enhanced structural cohesion, porosity, and thermal stability, which makes it suitable for particulate entrapment. Scanning electron microscopy (SEM) images revealed that sintered filters exhibit dispersed bentonite and carbon fibers, with pyrolyzed fibers providing a more compact structure. The resulting filter exhibited an average specific surface area of 56.58 m2/g and an average pore size of 3.36 nm, while analyses confirmed the presence of Cu and Mn oxides within the bentonite matrix with synergistic interactions between catalysts. Thermogravimetric analysis (TGA) showed that Cu/Mn-bentonite catalysts reduced soot oxidation onset temperatures to approximately 245.26°C and 471.89°C, providing efficient catalytic performance at lower temperatures while maintaining stability. These results effectively demonstrate the potential of recycled carbon fibers for integration with Cu/Mn catalysts to develop DPFs.

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Info:

Periodical:

Key Engineering Materials (Volume 1052)

Pages:

77-86

DOI:

https://doi.org/10.4028/p-8ThJrl

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Online since:

May 2026

Authors:

Ramuel John I. Tamargo*, Apraile Hope P. Dumrigue, Katrina Nadine Q. Cada, Roimela D. Carcer, Alea Angela M. Serrano

Keywords:

Carbon Fiber-Based Filter, Chemical Treatment, Diesel Particulate Filter, Soot Oxidation, Two-Step Pyrolysis

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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