Development and Mechanistic Investigation of Mixed Metal Oxides (MMOs) and Nanocomposites as Multi-Functional Catalysts
Date of Completion
Reactive Oxygen Species, Heterogeneous, Catalysis, Materials, Synthesis
Steven L. Suib
Field of Study
Doctor of Philosophy
There are 4 chapters in this thesis. Chapter 1 presents photo-assisted PMS activation using cobalt doped mesoporous iron oxide with exceptional activity and stability up to 6 cycles and very low cobalt leaching. The effects of cobalt doping are shown using different characterization techniques. The high surface area and monomodal pore sizes are maintained with minimal cobalt incorporation. This study correlates the activity to increased labile oxygen induced by cobalt doping. Chapter 2 details the synthesis of mesoporous first–row transition metal ferrites. M2+ (Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+) ferrite synthesis was systematically studied using a Biotage Initiator microwave apparatus and the effects of reaction time and initial M2+ concentration on the structure, morphology, composition, and catalytic activity were evaluated. These materials were then applied to electrochemical oxygen evolution reaction where NiFe2O4 showed high activity vs. the other ferrites with a low overpotential of 278 mV at 10 mA/cm2. Chapter 3 presents a photo-assisted selective catalytic oxidation of acetonitrile to acetamide on octahedral molecular sieves.
(K-OMS-2) catalysts with oxygen as the sole oxidant. Under this protocol, the catalysts exhibit 100% selectivity towards the formation of acetamide and 15% conversion. The role of light and oxygen is discussed along with a kinetic study of the reaction. Kinetic isotope effect (KIE) studies were conducted to identify the rate-determining step (RDS) and an inverse KIE is observed. Chapter 4 is a review that surveys the chemistry of molecular oxygen, the generation mechanisms and detection methods of reactive oxygen species in heterogeneous selective catalytic oxidations.
Achola, Laura, "Development and Mechanistic Investigation of Mixed Metal Oxides (MMOs) and Nanocomposites as Multi-Functional Catalysts" (2020). Doctoral Dissertations. 2479.
Available for download on Saturday, April 29, 2023