Sustainability and green chemistry are intimately connected to chemical catalysis.  Moreover, there is no more important initial question in a given catalytic reaction than �what is the true catalyst?�, since optimizing catalyst activity, lifetime, selectivity, isolation, and regeneration all depend on knowledge of the identity and composition of the true catalyst.  The short talk will present recent evidence on the �who is the true catalyst?� question for the title system based on in operando XAFS spectroscopy, kinetic studies, and especially quantitative kinetic poisoning data.  The results provide a compelling case for Rh4, subnanometer cluster-based benzene hydrogenation catalysis at 100 oC and 50 atm H2 pressures [1]. [1] Bayram, E.; Linehan, J. C.; Fulton, J. L.; Roberts, J. A.S.; Szymczak, N. K.; Smurthwaite, T. D.; �zkar, S.; Balasubramanian, M.; Finke, R. G., J. Am. Chem. Soc. 2011 , in press (doi.org/10.1021/ja2073438).

Is it single metal homogeneous, nanocluster heterogeneous, or perhaps subnanometer cluster catalysis?  The classic case of benzene hydrogenation catalysis beginning with [Cp*RhCl<sub>2</sub>]<sub>2</sub>

243rd National Meeting (2012)

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Is it single metal homogeneous, nanocluster heterogeneous, or perhaps subnanometer cluster catalysis? The classic case of benzene hydrogenation catalysis beginning with [Cp*RhCl2]2

Is it single metal homogeneous, nanocluster heterogeneous, or perhaps subnanometer cluster catalysis? The classic case of benzene hydrogenation catalysis beginning with [Cp*RhCl₂]₂