ACTIVE ELECTRONIC STATES OF SILVER CATALYSTS FOR METHANOL SELECTIVE OXIDATION

The results of investigations of the electronic and catalytic properti es of silver catalysts by IR spectroscopy of adsorbed carbon monoxide, diffuse reflectance electron spectroscopy, electron microscopy and ca talytic testing have been combined and examined. Of those metals of wh ich the configuration of the valence electronic shell is d(n)s(1) (Cu, Ag, Au, Pt, Pd, Ph, Ru), silver has the highest effective charge as M (+) cation due to the most resistant d-electron shell. Supports and mo difying additions of metal oxides have a pronounced effect on the elec tronic state and red-ox properties of silver as a result of donor-acce pter interaction of the metal oxide. The factors that stabilize the io nic state of silver and increase its effective charge seem to improve the catalytic properties of silver in methanol oxidation. A hypothesis on the active electronic state of silver in this process - Ag+ cation s with maximum effective charge - is suggested based on comparison of spectroscopic and catalytic data.