Novel caped Pd nanoparticles-liquid chromatography-tandem mass spectrometry for the identification of oxygenates in Saudi Arabian crude oil

doi:10.3724/SP.J.1123.2017.07017

Abstract

Abstract:

Saudi Arabian crude oil is a super complex mixture and, up to now, there has been little research into its heteroatom-containing compounds.First, oxygenated compounds (OCs) were isolated from Saudi Arabian oil using a Pd nanoparticle exchange complex, which formed between the nano-Pds and the oxygenated ligands.Normally, polycyclic aromatic sulphur heterocycles (S-PAHs) are separated from petroleum oil via the same method.The obtained results reveal that all the OC formulations with S-PAHs can be separated from the pre-isolated aromatic fraction of crude oil via this approach.S-PAHs are mixtures of benzothiophene and dibenzothiophene congeners.The isolated OCs are composed mainly of hydroxyl compounds.The liquid chromatography (LC)/electrospray ionization (ESI) in positive ion mode ESI (+)/tandem mass spectrometry (MS/MS) technique was used to assign the molecular weight distribution and identify the isolated OCs.The LC/ESI (+)-MS/MS technique differentiates S-PAHs and OCs using protonated ions.Thus, LC/ESI (+)-MS/MS can be used to assign molecular weight distributions for both the groups as a single mixture.MS/MS in precursor ion mode was used for the immediate identification of the target S or O analytes.

Key words: crude oil, liquid chromatography (LC), oxygenates, Pd nanoparticles, tandem mass spectrometry (MS/MS)

CLC Number:

O658

Nagy E. MOUSTAFA, Kout El-Kloub Fars MAHMOUD. Novel caped Pd nanoparticles-liquid chromatography-tandem mass spectrometry for the identification of oxygenates in Saudi Arabian crude oil[J]. Chinese Journal of Chromatography, 2018, 36(4): 362-369.

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