characterization of high-silica mordenite obtained by direct synthesis
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abstract
three high-silica mordenite zeolites differing in sio440, ratio were prepared by direct synthesis without using any template. the products si02/a120, ratio is influenced by the starting gel composition. this ratio is increased upon ion-exchange with nh,cl and subsequent calcination to prepare protonic mordenite. the protonic mordenites with si02/a1203ra tios of 14.6,29.2 and 34.6 were characterized by x-ray diffraction, energy dispersive x-ray microprobe analysis, scanning electron microscopy and thermogravimetric analysis. catalytic cracking of n-hexane was studied as a measure of catalytic activity of protonic mordenites. catalytic activities are expressed as conversion percent of n-hexane. catalysts with higher si02/a1,03 were found to be more active
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Journal title:
journal of sciences islamic republic of iranجلد ۹، شماره ۲، صفحات ۰-۰
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