BIOSYM TECHNOLOGIES, INC. / SCIENCE PHOTO LIBRARY BIOSYM TECHNOLOGIES, INC. / SCIENCE PHOTO LIBRARY
Molecular sieve. Computer graphic of a molecule of 2, 6-DIPN (2,6-diisopropylnaphthalene) passing through a channel in a molecule of mordenite. This graphic illustrates the use of mordenite as a "molecular sieve" in the synthesis of the 2, 6 iso- mer of DIPN. When mordenite is used as a catalyst, however, a higher proportion of the 2,6 isomer is made because the 2, 7 isomer passes less easily through mordenite's pores. Mordenite is one of many "zeolites" used in indus- try for shape-sensitive catalysis. Its molecular framework is based on the formula (Si, Al)nO2n.
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