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A combination of infrared spectroscopy and adsorption and microcalorimetric studies of molecules with different kinetic diameters, such as toluene, meta- and orthoxylene, and 1,2,4-trimethylbenzene, together with consecutive adsorption of these molecules, confirms the presence in MCM-22 of 10-membered ring channels and cavities of larger dimensions, both of which can be reached from the external surface...
Zeolite MCM-22 has been studied by infrared (i.r.) spectroscopy, thermoprogrammed desorption (t.p.d.) of NH 3 , and 27 Al n.m.r. with magic angle spinning (MAS). It has been found that zeolites MCM-22 and ZSM-5 both have framework i.r. bands at about 1,245 and 550 cm −1 , and zeolites MCM-22 and Y both have two pore opening i.r. bands at about 380 and 317 cm −1 . In...
MCM-22 has been synthesized as a unique phase and with good crystallinities in a range of different SiO 2 Al 2 O 3 ratios using hexamethylenimine as a template. ForSiO 2 Al 2 O 3 ratios around 30, MCM-22 can be obtained as a pure phase and with good yields in a relatively broad range ofOHSiO 2 ratios, although the efficiency in Si incorporation...
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