Characterization of Large Nonvolatile Polyaromatic Molecules by a Combination of In-Source Pyrolysis and Field Desorption Mass Spectrometry

摘要

Nonvolatile hydrocarbon systems, such as those formed via molecular weight growth reactions in refinery processes, normally have a low H/C atomic ratios (<0.5) and high boiling/decomposition points (>600 deg.C). these materials pose a great challenge to mass spectrometric analysis due to difficulties in vaporization and ionization. IN this work, the combination of IN-Source Pyrolysis Mass spectrometry (ISPyMS) and Field Desorption Mass spectrometry (FDMS) were utilized to Obtain compositional information for a nonvolatile organic deposit (foulant) generated by a hydrocracking process.