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- W3135505225 abstract "In this work, we present a multiscale experimental and modeling study focusing on the reactivity and flow permeability characteristics of the soot, relevant for SCR-coated particulate filter applications. Extensive kinetic studies on a synthetic gas bench were initially conducted to understand the role of NO2 on soot oxidation, employing both uncoated and SCR-coated filters. Experimental results suggest that carbon reactions with O2 and NO2 are not a simple superimposition and that strong synergistic phenomena between the two are present. These results were used to calibrate a physicochemically informed SCRoF mathematical model, which was subsequently validated against engine tests, confirming the need for an extended soot reaction mechanism. Irrespectively of the filter coating, the size of the emitted soot particles seems to affect the reactivity of the soot. Soot deposits with a smaller mean particle size were experimentally found to exhibit a higher soot oxidation rate and correlated with the higher available surface area. Next, the backpressure increase, associated with the addition of SCR coating, was evaluated by direct comparison of a DPF and a SCRoF. Experimental results showed that the rate of flow-resistance increase with increasing soot loading is different between the two filters, indicating a dependency of the soot physicochemical properties from the catalytic coating. The backpressure behavior of SCRoF was also evaluated under regeneration conditions, where a nonlinear decrease was observed with decreasing soot loading. Then, the accuracy of the soot deposition/oxidation model was evaluated, employing destructive methods to characterize the in-filter axial soot distribution profiles under both reacting and nonreacting conditions. In a final step, transient driving cycle sequences were performed to evaluate the correlation between backpressure and the accumulated soot amount inside the filter." @default.
- W3135505225 created "2021-03-15" @default.
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- W3135505225 date "2021-03-05" @default.
- W3135505225 modified "2023-09-27" @default.
- W3135505225 title "Physicochemical Soot Properties and Their Impact on SCR-Coated Filters" @default.
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- W3135505225 doi "https://doi.org/10.1021/acs.iecr.0c05599" @default.
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