Silicalite aromatic compounds

The interaction of different nitriles (acetonitrile, pivalonitrile and benzonitrile), of branched aliphatic compounds (2,2-dimethylbutane, reri-butyl-alcohol, methyl-rert-butylether, methyl and dimethylcyclohexanes) and of aromatics (benzene, toluene, ortho-, meta- and para-xylene, pyridine, picolines and lutidine) has been studied over four different ZSM5 zeolites, over silicalite-1 and titanium silicalite-1 and over boralite BOR-C. Internal, external and extraframework sites have been characterized and the access to the cavities discussed. 

Usually, fluid inclusion oils are measured by GC-MS as whole oils (i.e., without prior fractionation), because extraction yields are usually very low (too low for gravimetric analysis). However, fluid inclusion oils can be fractionated into total hydrocarbon fractions and nitrogen-sulfur-oxygen (NSO) fractions to avoid unwanted interference of NSO compound peaks with aliphatic and aromatic hydrocarbon peaks. Furthermore, samples that have significant n-alkane interference, in particular in their biomarker distributions, can be further separated into n-alkanes and branched and cyclic hydrocarbon fractions by using molecular sieves (e.g., ZSM-5 sieve such as silicalite, a zeolitlic form of silica). 

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