Catalyst design for selective oxidation with molecular oxygen by metal-complex attachment

We have prepared novel metal-ensemble catalysts by chemical attachment of metal-complex precursors, N-interstitial Re10 cluster supported on HZSM-5 and chiral self-dimerized V-dimer on SiO2, which are active and highly selective for selective oxidation with molecular oxygen. The Re10(N)2/HZSM-5 catalyst exhibited 87.7% (steady-state reaction) and 93.9% (pulse reaction) selectivity for direct phenol synthesis from benzene with molecular oxygen. The structures of active metal species were characterized by EXAFS, TPD and DFT calculations. The chiral self-dimerized V-dimer catalyst was found to be the first heterogeneous catalyst for the asymmetric oxidative coupling of 2-naphthol with molecular oxygen, which exhibited 100% selectivity and 90% enantioselectivity.