(24f) The Elusive Surface M2O7 Dimer Active Site

The presence of dimeric surface M₂O₇ (O₃M-O-MO₃) active sites have been proposed over the years to be present in numerous supported metal oxide catalyst systems that find application in energy solutions (e.g., conversion of CH₄ to C₂H₄/C₂H₆, CH₄ to aromatics, CH₃OH oxidation, selective catalytic reduction of NO_x, etc.). With advances in modern molecular spectroscopic approaches, it is now possible to examine the molecular and electronic structure of the supported metal oxide active sites under controlled environmental conditions. This presentation will examine the nature of the surface metal oxide active sites for several systems where dimeric surface M₂O₇ active sites have been proposed.