1 research outputs found
Toward Understanding the Catalytic Synergy in the Design of Bimetallic Molecular Sieves for Selective Aerobic Oxidations
Structure–property correlations and mechanistic
implications
are important in the design of single-site catalysts for the activation
of molecular oxygen. In this study we rationalize trends in catalytic
synergy to elucidate the nature of the active site through structural
and spectroscopic correlations. In particular, the redox behavior
and coordination geometry in isomorphously substituted, bimetallic
VTiAlPO-5 catalysts are investigated with a view to specifically engineering
and enhancing their reactivity and selectivity in aerobic oxidations.
By using a combination of HYSCORE EPR and <i>in situ</i> FTIR studies, we show that the well-defined and isolated oxophilic
tetrahedral titanium centers coupled with redox-active VO<sup>2+</sup> ions at proximal framework positions provide the loci for the activation
of oxidant that leads to a concomitant increase in catalytic activity
compared to analogous monometallic systems