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<b style="font-family: "Times New Roman", serif; font-size: 12pt; color: inherit; font-style: inherit; font-variant-ligatures: inherit; font-variant-caps: inherit; background-color: ;"><span style="font-size:14.0pt; color:#0D0D0D">NAME</span></b><b style="font-family: "Times New Roman", serif; font-size: 12pt; color: inherit; font-style: inherit; font-variant-ligatures: inherit; font-variant-caps: inherit; background-color: ;"><span style="font-size:14.0pt; color:#005A58">
</span></b><span style="font-family: "Times New Roman", serif; font-size: 14pt; color: rgb(13, 13, 13);">Zhiyu Zhou</span><br>
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<b><span style="font-size:14.0pt; color:black">COMMITTEE CHAIR: </span></b><span style="font-size:14.0pt; color:black">Dr. Michael P Harold</span></p>
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<b><span style="font-size:14.0pt; color:black">DATE: </span></b><span style="font-size:14.0pt; color:black">Tuesday, December 08, 2020</span></p>
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<b><span style="font-size:14.0pt; color:black">TIME: </span></b><span style="font-size:14.0pt; color:black">1:00 PM (CST)</span></p>
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<b><span style="font-size:14.0pt; color:black">LOCATION:</span></b><span style="font-size:14.0pt; color:black">
</span><span style="font-size:14.0pt">(Zoom Link) <a href="https://urldefense.com/v3/__https:/aiche.zoom.us/j/99836529079?pwd=RjBlUGpPUkUvdEtCdkdDMk9kdlFTQT09__;!!LkSTlj0I!RK8Fh6wRV8yCcUvlQhxqkwxKntEmWh_7i2gjyUt5c26T0te7c8ehN0A5QjrYDxH4J6YM$">
<span style="color:#0563C1">https://aiche.zoom.us/j/99836529079?pwd=RjBlUGpPUkUvdEtCdkdDMk9kdlFTQT09</span></a> </span></p>
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<b><span style="font-size:14.0pt; color:black">TITLE: </span></b></p>
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<b><span style="font-size:14.0pt; color:black">Role of Storage Material in NOx Storage and Reduction (NSR) and Three-Way Catalysts (TWC) During Cyclic Operation</span></b></p>
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<b><span style="font-size:14.0pt">Abstract:</span></b></p>
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NOx storage and reduction (NSR) is a cyclic catalytic process that eliminates NOx from lean burn vehicles. There is an active debate about the NOx reduction mechanism, particularly at a high temperature and cycle frequency. Three-way catalysts (TWC) are widely
applied in stoichiometric combustion vehicles. The invention of novel oxygen storage materials (OSM), such as spinels, requires more advanced understanding of their promotion impacts.
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NOx reduction under net lean and near-stoichiometric conditions was carried out on CeO<sub>2</sub>, Pt/Al<sub>2</sub>O<sub>3</sub>, Pt/CeO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> and Pt/BaO/Al<sub>2</sub>O<sub>3</sub> washcoated monoliths to compare performance
features and identify reaction pathways. The NOx storage functionality is essential for NOx reduction under net lean conditions while the oxygen storage functionality promotes NOx reduction for near-stoichiometric conditions. The improved NOx storage utilization
is mainly responsible for NOx conversion enhancement under fast cycling. A ceria redox pathway has only a secondary effect on NOx conversion under excess O<sub>2</sub>.<span style="font-size:11.0pt; line-height:150%; font-family:"Calibri",sans-serif"></span></p>
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Simultaneous conversion of NO, CO and C<sub>3</sub>H<sub>6</sub> under stoichiometric conditions was carried out on catalysts containing OSM-promoted mixed precious group metal (PGM: Pt(95%)/Pd(5%)). The studied OSMs include ceria-zirconia (<span style="color:black">Ce<sub>0.3</sub>Zr<sub>0.7</sub>O<sub>2</sub></span>;
CZO) and mixed metal oxide spinel (Mn<sub>0.5</sub>Fe<sub>2.5</sub>O<sub>4</sub>; MFO). PGM supported directly on the OSM was found to be the best design for CZO while a dual-layer architecture (top PGM layer, bottom MFO layer) outperformed the MFO-supported
PGM catalyst. Close coupling between the PGM and CZO is responsible for the activity promotion. Enhancement obtained with the dual-layer PGM-MFO architecture relies on a direct catalytic contribution from the spinel.
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A combined experimental and modeling study of dynamic oxygen storage capacity (DOSC) of CZO and MFO spinel using CO and H<sub>2</sub> was conducted. During reduction (or oxidation), either oxide exhibits a transition in rate-controlling regime, from a fast,
reaction-controlled process to a much slower diffusion-controlled process. For CZO the classical shrinking-core model is successfully applied to describe the transient DOSC performance. For MFO, with its higher oxygen storage capacity (OSC), reduction is confined
to oxygen within the first surface layer of the dispersed spinel crystallites. A progressive model is developed for MFO that is capable of capturing the DOSC performance under both long cycle (60s) and short cycle (1~2s).<span style="font-size:11.0pt; line-height:150%; font-family:"Calibri",sans-serif; color:#1B222B"></span></p>
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