Design of composite micro/mesoporous molecular sieve catalysts
I. I. Ivanova, A. S. Kuznetsov, V. V. Yuschenko, and E. E. Knyazeva
Department of Chemistry, Moscow State University,
Lenin Hills, Moscow 119992, Russia
Abstract: Two series of composite micro/mesoporous materials
with different contributions of micro- and mesoporosity were prepared
by dealumination and recrystallization of mordenite zeolite. The materials
were characterized by X-ray diffraction, infrared spectroscopy, 27Al
magic angle spinning (MAS) NMR, nitrogen adsorption�desorption, and
temperature-programmed desorption of ammonia (TPD NH3). Catalytic
properties were studied in transalkylation of biphenyl with diisopropylbenzene.
Both types of composite materials showed remarkably high activity, stability,
and selectivity toward formation of di-isopropylbiphenyls with respect
to both pure microporous and mesoporous materials. The effect is due
to high zeolitic acidity combined with improved accessibility of active
sites and transport of bulky molecules provided by mesopores.
*Plenary lecture presented at the XVII Mendeleev Congress on General and Applied Chemistry, Kazan, Tatarstan, Russia, 21 -26 September 2003. Other presentations are published in this issue, pp. 1605-1798.
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