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

Autor:	M. Siskin, Kuangnan Qian, Kathleen E. Edwards
Rok vydání:	2001
Předmět:	chemistry.chemical_classification Chemistry General Chemical Engineering Analytical chemistry Energy Engineering and Power Technology Aromaticity Mass spectrometry chemistry.chemical_compound Fuel Technology Hydrocarbon Field desorption Vaporization Polystyrene Pyrolysis Alkyl
Zdroj:	Energy & Fuels. 15:949-954
ISSN:	1520-5029 0887-0624
DOI:	10.1021/ef010023e
Popis:	Nonvolatile hydrocarbon systems, such as those formed via molecular weight growth reactions in refinery processes, normally have a low H/C atomic ratios ( 600 °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. A mixture of polystyrene standards was also analyzed for reference purposes. FDMS yields intact molecular ions for the large polyaromatic systems (∼15 aromatic rings on average). ISPyMS, on the other hand, converts the large multi-core aromatic systems into relatively small single aromatic cores that could be analyzed in detail. In this case, 28 aromatic cores containing short alkyl chains were identified by ISPyMS. Average fou...
Databáze:	OpenAIRE
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