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<b><span style="font-size:14.0pt; line-height:200%">PhD Dissertation Defense of Kyle Karinshak</span></b></p>
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<b><span style="font-size:14.0pt; line-height:200%"> </span></b></p>
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<b><span style="font-size:14.0pt; line-height:200%">Date: </span></b>Monday, December 6th, 2021</p>
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<b><span style="font-size:14.0pt; line-height:200%">Time:</span></b><span style="font-size:14.0pt; line-height:200%">
</span>11am to 1pm<span style="font-size:14.0pt; line-height:200%"></span></p>
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<b><span style="font-size:14.0pt; line-height:200%">Committee Chair: </span></b>Prof. Michael Harold<span style="font-size:14.0pt; line-height:200%"></span></p>
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<b><span style="font-size:14.0pt; line-height:200%">Location: </span></b>Chem. E. Conference Room</p>
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<b><span style="font-size:14.0pt">Virtual Link:</span> </b><a href="https://urldefense.com/v3/__https:/zoom.us/j/98977293284?pwd=VGtKSmxkditpUHRreWhyaWk2RlN3Zz09__;!!LkSTlj0I!FmpTinSFh7Q_0ZdtHKoz8srfsUoH1bA1hfcd250YIsjXIlzNKl1hh2YbD14naSStlZKtybAoA2zD3_0LznSL-OjB812IcLpc$">https://zoom.us/j/98977293284?pwd=VGtKSmxkditpUHRreWhyaWk2RlN3Zz09</a></p>
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<b><span style="font-size:14.0pt">Password:</span> </b>Mn05Fe25O4</p>
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<b><span style="font-size:14.0pt; line-height:200%">Title:</span></b><span style="font-size:14.0pt; line-height:200%"> </span>Enhanced Methane Oxidation Catalysis Through Feed Modulation And Oxygen Storage</p>
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<b><span style="font-size:14.0pt">Abstract: </span></b><span style="font-size:14.0pt"></span></p>
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The elimination of uncombusted CH<sub>4</sub> from Natural Gas Vehicle emissions is necessary to meet future greenhouse gas regulations, requiring the development and optimization of novel methane oxidation catalyst. In this project, the catalytic oxidation
of methane is examined under lean and stoichiometric conditions across several catalysts and how feed modulations can enhance catalyst performance. In the first section of this project, the effects of reductive H<sub>2</sub> pulses were examined for Pd-Pt/Al<sub>2</sub>O<sub>3</sub>
and Pd-Pt/ CeO<sub>2</sub> ZrO<sub>2</sub>-Y<sub>2</sub>O<sub>3</sub>-La<sub>2</sub>O<sub>3
</sub>catalysts. Alternating H<sub>2</sub>/O<sub>2</sub> pulses resulted in significant and sustained methane oxidation activity, even when large quantities of H<sub>2</sub>O were present in the feed.</p>
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The second part of the project involves the design and optimization of novel Four-Way Catalysts – bimetallic Pt/Pd catalysts supported on Al<sub>2</sub>O<sub>3</sub> and augmented by mixed-metal oxides, otherwise known as spinels. We initially demonstrate
the enhancements resulting from the combination of spinels and modulating feed conditions. Next, we optimize catalyst performance by examining the impact of different feed modulation parameters such as oscillation frequency, amplitude, and average lambda.
Optimal catalyst performance was determined to occur under slightly rich, near-stoichiometric feed conditions, under high oscillation amplitudes and slow oscillation frequencies. Methane conversion enhancement is linked to its nonmonotonic dependence on O<sub>2</sub>.</p>
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The project concludes with the modelling of methane oxidation over a Pt-Pd/Al<sub>2</sub>O<sub>3</sub> catalyst, in preparation of future Four-Way Catalyst modelling efforts. A global kinetic model for total oxidation of methane, steam methane reforming,
and the reversible water gas shift reaction was created and modelled in a simple PFR model and a low-dimensional, dual-phase, washcoat model. Both models were fit to collected experimental data. We conclude with proposals for further research based on the
results of this project.</p>
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