Mass alkylaromatics

Microbial transformations of DOM were also studied by incubation experiments. The DOM extracted from maize straw and forest floors was incubated for 90 days and samples taken before and after incubation were analyzed by Py-FIMS and complementary UV absorbance, fluorescence emission spectroscopy, FTIR-spectroscopy, 1H NMR spectroscopy, and 13C natural abundance (Kalbitz et al., 2003). The Py-FI mass spectra showed increases in the proportions of phenols and lignin monomers at the expense of lignin dimers and alkylaromatics during... 

Coke deposits were studied using mass spectra obtmed from the probe El and Cl analyses of the deactivated catalysts arising from the various feed streams. Alkane and alkene fragments were observed to dominate the individual mass spectra (particularly, m/z 57, 71 and 55, 69, respectively, in the El mode). Although alkylaromatics were evident for the catalyst from the tests with n-hexadecane and the n-hexadecane/phenanthrene mixture PACs are only present in trace quantities. Quinoline addition gave rise to much less intense ions from the deactivated catalyst due to its lower carbon content and the reduced sensitivity made it difBcult to observe the aromatic fragments. Indeed, the most intense peak was from quinoline itself (m/z 129 El, 130 Cl). 

This work has demonstrated for the first time that chemically tethered fluorinated surfactant molecules on the surface of silica can act as a new carrier for w ater-soluble catalytic species in SCCO2, which facilities excellent mass transfers for biphasic catalysis. Thus, a cleaner process for the oxidation of alkylaromatic molecules without the use of corrosive acetic acid is reported. 

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