Av. Kucherov et Aa. Slinkin, SOLID-STATE REACTION AS A WAY TO TRANSITION-METAL CATION INTRODUCTIONINTO HIGH-SILICA ZEOLITES, Journal of molecular catalysis, 90(3), 1994, pp. 323-354
A detailed review is given of transition metal cation incorporation in
to zeolites by a solid-state reaction. The procedures and techniques s
uitable for investigation of solid-state ion exchange in zeolites are
described. It is shown that a solid-state reaction is a promising way
for introduction of one or several transition metal ions into cationic
positions of high-silica zeolites. The majority of these polyvalent c
ations cannot be introduced into these matrices by other methods. The
influence of different factors (temperature and atmosphere of calcinat
ion, Al3+ Content in zeolitic lattice, presence of either co-cations o
r anionic species) on cationic species stabilization is analyzed. It i
s shown that pentasil-based systems with discrete types of isolated tr
ansition metal cations are unique objects for studying the relationshi
p between catalytic properties and local topography of isolated redox
sites. A solid state modification of pentasils permits the preparation
of active and stable catalysts both for complete oxidation of alkanes
and for NO(x) decomposition.