Silver-Based Catalysts on Metal Oxides for Diesel Particulate Matter Oxidation: Insights from In Situ DRIFTS
Diesel particulate matter (DPM) represents a deleterious environmental contaminant that necessitates the development of effective catalytic oxidation methodologies. This research delineates a comparative analysis of silver-supported metal oxide catalysts (Ag/Al<sub>2</sub>O<sub>3&l...
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2025-04-01
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| author | Punya Promhuad Boonlue Sawatmongkhon Thawatchai Wongchang Ekarong Sukjit Nathinee Theinnoi Kampanart Theinnoi |
| author_facet | Punya Promhuad Boonlue Sawatmongkhon Thawatchai Wongchang Ekarong Sukjit Nathinee Theinnoi Kampanart Theinnoi |
| author_sort | Punya Promhuad |
| collection | DOAJ |
| description | Diesel particulate matter (DPM) represents a deleterious environmental contaminant that necessitates the development of effective catalytic oxidation methodologies. This research delineates a comparative analysis of silver-supported metal oxide catalysts (Ag/Al<sub>2</sub>O<sub>3</sub>, Ag/TiO<sub>2</sub>, Ag/ZnO, and Ag/CeO<sub>2</sub>), with an emphasis on the effects of silver distribution and the metal-support interaction on the oxidation of DPM. An array of characterization techniques including XRD, HRTEM, XPS, H<sub>2</sub>-TPR, TEM, GC-MS, TGA, and in situ DRIFTS was employed. The novelty of this study resides in elucidating the oxidation mechanism through a tripartite pathway and recognizing Ag<sup>0</sup> as the predominant active species involved in soot oxidation. The Ag/Al<sub>2</sub>O<sub>3</sub> catalyst demonstrated superior catalytic performance, achieving a reduction in the ignition temperature by more than 50 °C, attributable to the optimal dispersion of Ag nanoparticles and a balanced metal-support interaction. Conversely, an excessive interaction observed in Ag/ZnO resulted in diminished catalytic activity. The oxidation of DPM transpires through the volatilization of VOCs (<300 °C), the oxidation by reactive oxygen species, and the combustion of soot (>300 °C). This investigation offers significant contributions to the formulation of highly efficient silver-based catalysts for emissions control, with a particular focus on optimizing Ag dispersion and support interactions to enhance catalytic efficacy. |
| format | Article |
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| publishDate | 2025-04-01 |
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| series | ChemEngineering |
| spelling | doaj-art-9730dec6199e422589f2ae429edbe8562025-08-20T02:24:37ZengMDPI AGChemEngineering2305-70842025-04-01934210.3390/chemengineering9030042Silver-Based Catalysts on Metal Oxides for Diesel Particulate Matter Oxidation: Insights from In Situ DRIFTSPunya Promhuad0Boonlue Sawatmongkhon1Thawatchai Wongchang2Ekarong Sukjit3Nathinee Theinnoi4Kampanart Theinnoi5KMUTNB Techno Park, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, ThailandResearch Centre for Combustion Technology and Alternative Energy (CTAE), Science and Technology Research Institute, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, ThailandResearch Centre for Combustion Technology and Alternative Energy (CTAE), Science and Technology Research Institute, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, ThailandSchool of Mechanical Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, ThailandDepartment of Ordnance Engineering, Chulachomklao Royal Military Academy, Nakhon Nayok 26001, ThailandResearch Centre for Combustion Technology and Alternative Energy (CTAE), Science and Technology Research Institute, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, ThailandDiesel particulate matter (DPM) represents a deleterious environmental contaminant that necessitates the development of effective catalytic oxidation methodologies. This research delineates a comparative analysis of silver-supported metal oxide catalysts (Ag/Al<sub>2</sub>O<sub>3</sub>, Ag/TiO<sub>2</sub>, Ag/ZnO, and Ag/CeO<sub>2</sub>), with an emphasis on the effects of silver distribution and the metal-support interaction on the oxidation of DPM. An array of characterization techniques including XRD, HRTEM, XPS, H<sub>2</sub>-TPR, TEM, GC-MS, TGA, and in situ DRIFTS was employed. The novelty of this study resides in elucidating the oxidation mechanism through a tripartite pathway and recognizing Ag<sup>0</sup> as the predominant active species involved in soot oxidation. The Ag/Al<sub>2</sub>O<sub>3</sub> catalyst demonstrated superior catalytic performance, achieving a reduction in the ignition temperature by more than 50 °C, attributable to the optimal dispersion of Ag nanoparticles and a balanced metal-support interaction. Conversely, an excessive interaction observed in Ag/ZnO resulted in diminished catalytic activity. The oxidation of DPM transpires through the volatilization of VOCs (<300 °C), the oxidation by reactive oxygen species, and the combustion of soot (>300 °C). This investigation offers significant contributions to the formulation of highly efficient silver-based catalysts for emissions control, with a particular focus on optimizing Ag dispersion and support interactions to enhance catalytic efficacy.https://www.mdpi.com/2305-7084/9/3/42silver catalystdiesel particulate matteroxide supportoxidation processes of diesel particulate matter |
| spellingShingle | Punya Promhuad Boonlue Sawatmongkhon Thawatchai Wongchang Ekarong Sukjit Nathinee Theinnoi Kampanart Theinnoi Silver-Based Catalysts on Metal Oxides for Diesel Particulate Matter Oxidation: Insights from In Situ DRIFTS ChemEngineering silver catalyst diesel particulate matter oxide support oxidation processes of diesel particulate matter |
| title | Silver-Based Catalysts on Metal Oxides for Diesel Particulate Matter Oxidation: Insights from In Situ DRIFTS |
| title_full | Silver-Based Catalysts on Metal Oxides for Diesel Particulate Matter Oxidation: Insights from In Situ DRIFTS |
| title_fullStr | Silver-Based Catalysts on Metal Oxides for Diesel Particulate Matter Oxidation: Insights from In Situ DRIFTS |
| title_full_unstemmed | Silver-Based Catalysts on Metal Oxides for Diesel Particulate Matter Oxidation: Insights from In Situ DRIFTS |
| title_short | Silver-Based Catalysts on Metal Oxides for Diesel Particulate Matter Oxidation: Insights from In Situ DRIFTS |
| title_sort | silver based catalysts on metal oxides for diesel particulate matter oxidation insights from in situ drifts |
| topic | silver catalyst diesel particulate matter oxide support oxidation processes of diesel particulate matter |
| url | https://www.mdpi.com/2305-7084/9/3/42 |
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