Characterization of heavy petroleum fraction by positive-ion electrospray ionization FT-ICR mass spectrometry and collision induced dissociation: Bond dissociation behavior and aromatic ring architecture of basic nitrogen compounds

查看全文 作　　者：ZHANG [1]LinZhou;ZHANG [1]YaHe;ZHAO [1]SuoQi;XU [1]ChunMing;CHUNG Keng [1]H.;SHI [1]Quan

机构地区：[1]State Key Laboratory of Heavy Oil Processing, China University of Petroleum

出　　处：《Science China Chemistry》索引2013年第56卷第7期,共9页

基　　金：supported by the National Basic Research Program of China(2010CB226901);the National Natural Science Foundation of China(U1162204 and 21236009) 摘　　要：This paper examined the bond dissociation behavior and aromatic ring architecture of basic nitrogen compounds in Sudan heavy petroleum fraction. Both broadband and quadrupole isolation modes positive-ion electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) coupled with collision induced dissociation (CID) techniques were used to characterize a low sulfur crude oil derived vacuum residuum (VR). The appropriate CID operating condition was selected by comparing the molecular weight distributions of the basic nitrogen compounds under various CID operating conditions. Both oddand even-electron fragment ions were observed from the mass spectrum, indicating that the heterolytic and homolytic bond cleavages occurred simultaneously during the CID process. The odd-electron fragment ions were predominant in each class species, indicating preferential heterolytic bond cleavages. At the optimal CID condition, the alkyl groups decomposed deeply and just left the aromatic cores of the nitrogen compounds. No significant variation in double bond equivalent (DBE) value was observed between the fragment and parent ions, revealing that the domination of single core structure. 关键词：碱性氮化合物碰撞诱导解离电喷雾电离石油馏分分离行为环结构正离子质谱法

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Characterization of heavy petroleum fraction by positive-ion electrospray ionization FT-ICR mass spectrometry and collision induced dissociation: Bond dissociation behavior and aromatic ring architecture of basic nitrogen compounds

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