Determination of the Monolayer-Adsorption-Capacitance and Accessible Catalytic Area of FeCrAl Sintered Metal Fibers: A Langmuir Isotherm Study for Diesel Particulate Filter

Abstract: The determination of specific surface area through Langmuir isotherm analysis is essential for characterizing iron-chromium-aluminum (FeCrAl) sintered metal fibers (SMFs), particularly for applications such as diesel particulate filter (DPF). This investigation utilized nitrogen physisorption analysis, The analysis of the data within the framework of the Langmuir adsorption model enables a systematic evaluation of the thermally oxidized samples The model determines the maximum monolayer adsorption capacity and provides a fundamental description of adsorbate-adsorbent interactions and quantifying the accessible surface area of the sintered metal fibers. The samples were prepared under varying conditions: single-stage thermal oxidation at 700°C (Sample 1), 800°C (Sample 2), 900°C (Sample 3), and 1000°C (Sample 5), along with a sample treated with multi-stage thermal oxidation process at 930, 960, and 990°C (Sample 4). The results revealed a significant effect of heat process on the surface area. Sample 3, oxidized at 900°C, showed the highest Langmuir surface area of 9710 cm²/g, implying that this oxidation temperature improves the development of oxide morphology with a high area on Sample 3 surface. On contrary, Sample 2, treated at 800°C, showed the lowest value of 792 cm²/g. Sample 4 exposed to multi-stage treatment showed the next highest value of 2698 cm²/g. Moreover, Samples 1 and 5 resulted values ranging between 1350 and 1700 cm²/g. The current investigation confirms that thermal oxidation is an important and controllable factor for modifying microstructure and developing the adsorption performance of FeCrAl SMFs surface area. Keywords: A Langmuir Isotherm, FeCrAl Sintered Metal Fibers, Thermal Oxidation, Surface Area, Structured Catalyst. Title: Determination of the Monolayer-Adsorption-Capacitance and Accessible Catalytic Area of FeCrAl Sintered Metal Fibers: A Langmuir Isotherm Study for Diesel Particulate Filter Author: Loai Ben Naji International Journal of Mechanical and Industrial Technology ISSN 2348-7593 (Online) Vol. 13, Issue 2, October 2025 - March 2026 Page No: 40-45 Research Publish Journals Website: www.researchpublish.com Published Date: 21-November-2025 DOI: https://doi.org/10.5281/zenodo.17670013 Paper Download Link (Source) https://www.researchpublish.com/papers/determination-of-the-monolayer-adsorption-capacitance-and-accessible-catalytic-area-of-fecral-sintered-metal-fibers-a-langmuir-isotherm-study-for-diesel-particulate-filter