Oxidation Kinetics of Soot on Acicular Mullite Membrane Filter Using Electron Microscopy and Thermogravimetric Analysis
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OXIDATION KINETICS OF SOOT ON ACICULAR MULLITE MEMBRANE FILTER USING ELECTRON MICROSCOPY AND THERMOGRAVIMETRIC ANALYSIS Eakkawut Saenkhumvong1), Preechar Karin1)*, Chinda Charoenphonphanich1), Naratip Vittayakorn2) and Katsunori Hanamura3) Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand 2) Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand 3) School of Engineering, Tokyo Institute of Technology, Tokyo 152-8550, Japan
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(Received 7 October 2019; Revised 25 January 2020; Accepted 24 February 2020) ABSTRACTThis paper investigates the oxidation kinetics of carbon black on acicular mullite using thermogravimetric (TGA) and mullite microstructures by scanning electron microscopy (SEM) for the development of diesel particulate filters (DPFs). It is observed that the amount of each chemical composition strongly affects the structure of mullite. The addition of AlF3 and V2O5 to mullite promotes the growth of needle-shaped mullite crystals. Thermogravimetric analysis was used to investigate and characterize chemical kinetics of soot oxidation for better understanding of designs and configurations of diesel particulate filters. The mass conversion of soot on the acicular mullite (ACM) is oxidized faster than that on the mullite (ML) membrane at all temperatures examined. The calculation of apparent activation energy (Ea) of soot oxidation with isothermal methods on mullite was presented. The results showed that activation energy of soot oxidation is enhanced with ACM than with ML at all temperatures examined. The average calculated apparent activation energy of soot oxidation on ACM and ML are 146.4 kJ/mole and 155.3 kJ/mole, respectively. KEY WORDS : Acicular mullite, Soot oxidation kinetic, Morphology, Microstructure, Particulate filter
1. INTRODUCTION
emission standards of each country. The composition in DPFs configurations affects the trapping mechanism and DPFs regeneration process (Karin et al., 2017; Oki et al., 2011). Currently, PMs emissions are becoming more stringent trending down to 5 mg/km for CI engines under EURO 6 standards (Mokhri et al., 2012). Therefore, the development and design of DPFs configurations require high performance to trap PMs as well as the reduction of PMs in CI engines. Mullite (3Al2O32SiO2) is an interesting ceramic material to apply to DPFs configuration because it has good mechanical properties compared to cordierite and SiC. Moreover, mullite may achieve acicular structure which contributes to increase trapping efficiency and reduce pressure drop in the DPFs (Zuberi et al., 2008). A number of research has been done on mullite ceramic which has some advantages such as increasing porosity and having high mechanical strength. According to the research of Cao et al. (2014), Mullite ceramic was created from ash with AlF3 and V2O5 as additives by using sintering process. The results showed that the microstructure of mullite membrane was i
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