Abstract
The interactions of both Ca and Zn with cordierite substrates were studied to better understand how Ca and Zn individually contribute to physio chemical changes in the cordierite diesel particulate filters (DPF) during high temperature engine exhaust conditions. The Ca and Zn doped cordierite samples were heated to temperatures of 300, 500, 900, and 1100 °C. Thermal treatment consisted of 1, 3, and 10 h exposure, separately, to simulate the duration of heat experienced by DPFs during use. Among the temperature profiles studied, SEM, XRD and EPMA mapping results indicate that the zinc–cordierite interaction is more severe in contributions to cordierite degradation than the calcium–cordierite interaction. The corrosion pathway generally followed the cordierite honeycomb porous structures. Appraised by the EPMA mapping, the element concentration across a given cordierite cross-section tends to increase for Zn doped samples, where calcium did not. XRD analysis indicate both the Ca and Zn can chemically interact with cordierite and alter the crystalline phases present at temperatures above 300 °C.
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