A. V. Kuznetsov, I. K. Vorontsova, and I. D. Mikheikin
Karpov Research Institute of Physical Chemistry, Russian State Scientific Center,
ul. Vorontsovo Pole 10, Moscow, 103064 Russia
Received October 13, 1995
Abstract—Adsorption of NO on model catalytic systems Mn/MgO for oxidative dimerization of methane was
studied at 150–350 K by IR diffuse reflectance spectroscopy. Interaction of NO with both Fs centers and man-
ganese ions in high-oxidation states yields nitrosonium ions (NO+). Adding small amounts of manganese results
in the formation of solid solutions on the surface of MgO. Increasing the concentration of manganese above
3wt % causes changes in the phase composition of the surface. Surface manganese cations in various oxidation
states (+2, +3, +4) can be active adsorption sites.
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