(363ar) Proximity Control of Active Sites to Facilitate Tandem Catalysis in Propane Oxidative Dehydrogenation

Propane oxidative dehydrogenation can significantly increase poor equilibrium conversion of direct propane dehydrogenation by consuming produced hydrogen with oxidants, providing heat from exothermic oxidation reaction, and pulling the equilibrium to have a higher yield of propylene. Oxidants can be strong O₂ molecules as well as soft CO₂ molecules, which determines the subsequent oxidation reactions such as selective hydrogen combustion or reverse water gas shift. To enable tandem reaction, we designed catalysts to have multiple active sites (herein Pt and metal oxide) and synthesized them to be physically touching. Atomic layer deposition (ALD) was employed to control nanometer-scale conformal deposition of metal oxides. We deposited very thin In2O3, MoO3, Bi2O3, and TiO2 layers by ALD on Al2O3 supported Pt catalyst to build an "overcoated" structure. The overcoated nanocatalysts offer not only multiple reactive species at the same time but also unique properties, herein proximity in particular. We characterized and tested ALD-derived metal oxide overcoats on Pt nanoparticle catalysts for oxidative propane dehydrogenation. As a result, multiple cornerstones will be addressed to enable tandem catalysis including proximity between active species, thermal stability, and reducibility. Moreover, evidence of kinetic coupling will be proposed from catalytic reaction data over different proximity within the catalysts.

Research Interests

My primary research interest lies in understanding the catalytic behavior of a wide range of catalytic materials. Thus, tailored synthetic skills are necessary such as nanoparticle synthesis, and atomic layer deposition, alongside conventional techniques like sol-gel, precipitation, and impregnation. This work entails characterizing the physiochemical properties as well as investigating reaction kinetics and underlying mechanisms. Through these pursuits, I have developed a comprehensive ability to manage complex projects and collaborate effectively with experts across disciplines. These insights have helped establish guiding principles for the design of advanced catalysts aimed at enhancing catalytic performance.

To achieve these objectives, I have explored a wide spectrum of reactants, ranging from simple molecules like hydrogen to more complex aromatic compounds such as guaiacol. My research has addressed a variety of challenging and high-impact catalytic reactions, including:

• Green synthesis of hydrogen peroxide from direct reaction of hydrogen and oxygen.
• Natural gas (methane, ethane, and propane) dehydro-aromatization for valuable aromatics.
• Propane oxidative dehydrogenation for the selective production of propylene.
• Biomass hydrodeoxygenation for valuable chemicals.

In addition to my chemistry-driven research, my interests extend to integrating advanced methodologies for material development. This includes a broad range of expertise, from computational simulations and nanoscale synthesis to advanced characterization techniques and comprehensive catalyst evaluation. By combining these elements, I have achieved synergistic effects that enhance catalyst design and performance.

Throughout my research career, I have consistently demonstrated the ability to identify promising catalyst candidates, solve complex material challenges, and apply insights to improve results and guide future development. My extensive experience in collaborative work has honed my interpersonal skills, allowing me to effectively navigate conflicts and drive synergy within teams. Curiosity and self-motivation are the core values that fuel my research, continuously shaping my identity as a dedicated and innovative researcher.