Professor Titel Jurca from University of Central Florida will present a seminar.
Due to inherent advantages relating to recoverability, temperature stability, and adaptability to industrial processes, heterogeneous catalysts dominate the industrial market share. Among those, palladium-based heterogeneous catalysts are critical enablers of numerous synthetic organic transformations. Examples range from C-C coupling reactions, C-H activations, to transfer and conventional hydrogenations. The superior reactivity, tuneable selectivity, and relative stability of Pd under broad-ranging conditions has bolstered its wide-spread adoption by the catalysis and synthetic organic chemistry communities. Conversely, Pd is a precious metal with numerous other applications including catalytic converters, electronics, medicine, purification technologies and jewellery. This combination of broad demand with limited supply results in high cost. Coupled with the fact that the majority of global Pd production originates from two countries (Russian Federation and Republic of South Africa), availability can be dramatically impacted by geopolitical events and supply chain disruptions leading to a volatile market. Platinum, rhodium, and ruthenium, are also critically important and subject to similar broad demands, and restricted availability. To ensure long-term availability and sustainable use of these critical materials, it is imperative to design highly efficient heterogeneous catalyst systems which utilize minimal amounts of precious metal, maximize reactivity, and enable facile recovery and reuse.
The development of an understanding-based hierarchical design of monolith-supported precious metal catalysts will be presented. Our efforts focus on the controlled growth of nanocatalysts on contiguous Ni foams. Ni foams afford numerous advantages; among these include ease of handling and facile separability inherent to monolith systems, a porous 3-D membrane framework amenable to application in continuous flow catalysis, the potential for resistive heating, and ferromagnetism which enables self-stirring. The application of these materials towards the catalytic hydrogenation of nitro, alkene, and alkyne moieties, in batch and flow, under mild conditions will be discussed.
Host: Dr. Paul Rupar