Highly dispersed supported Ta(V) species have been studied for quinoline hydrodenitrogenation (HDN). Although Ta exhibits low turnovers, it exhibits high selectivity toward propylbenzene (PB) under reducing conditions. Promotion of the Ta by small amounts of Pd significantly increases the lifetime of the catalyst yet maintains the selectivity toward PB despite the strong hydrogenating abilities of Pd. This enhanced selectivity toward PB is more pronounced when Pd is impregnated onto supported Ta(V) -calixarene complexes than when other less sterically hindered Ta precursors or physical mixtures of supported Pd and Ta catalysts are used.

Synergism of Ta and Pd in hydrodenitrogenation catalysis

244th National Meeting (2012)

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