Molecular Weight Distributions of Asphaltenes and Deasphaltened Oils Studied by Laser Desorption Ionization and Ion Mobility Mass Spectrometry

被引：61

作者：

Becker, Chris ^{[1
]}

Qian, Kuangnan ^{[2
]}

Russell, David H. ^{[1
]}

机构：

[1] Texas A&M Univ, College Stn, TX 77843 USA

[2] ExxonMobil Res & Engn Co, Annandale, NJ 08801 USA

来源：

ANALYTICAL CHEMISTRY | 2008年 / 80卷 / 22期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1021/ac801473f

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Laser desorption ionization (LDI) and ion mobility mass spectrometry (IM-MS) are applied to study molecular weight distribution and cross sections of petroleum asphaltene (ASPH) and deasphaltened oils (DAO). Ion mobility data confirmed the presence of gas-phase aggregation in LDI experiments. Most of the molecules with MW > 3000 g/mol in LDI result from gas-phase aggregation. Two-dimensional (2D) IM-MS trend lines are compared with model polymer systems to confirm the order of cross sections (polywax > polystyrene >> DAO > ASPH >> fullerenes), and these data illustrate that ASPH has a more condensed average structure than DAO.

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页码：8592 / 8597

页数：6

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