PEFTEC 2019 - Abstract

Abstract Title: Analysis of diesel and components via gas chromatography-mass spectrometry and ultra-high performance supercritical fluid chromatography-mass spectrometry
Abstract Type: Poster
Session Choice: Other
Presenter Name: Mrs Anastarsia Carter
Co-authors:Dr Jim Barker
Ms Jacqueline Reid
Prof G. John Langley
Company/Organisation: University of Southampton
Country: United Kingdom

Abstract Information :

Recently, fuel injector deposits within common rail diesel engines have become more prevalent and due to associated engine performance issues much interest has been generated around these deposits.

Increased frequency of deposit formation coincided with increasingly strict emission legislation that resulted in multiple changes to both diesel fuel composition and fuel injection systems. This included increased biodiesel, decreased sulfur levels in diesel and also fuel injection pressures have increased as nozzle hole diameters have decreased.

Deposit-forming and non-deposit forming diesels were analysed using assorted chromatography coupled with mass spectrometry.
Differences and similarities between fuels were investigated to identify components which may be involved in deposit formation.

Gas chromatography - mass spectrometry (GC-MS) analysis of various diesels only identified hydrocarbons and fatty acid methyl esters. Ultra-high performance supercritical fluid chromatography - positive ion electrospray ionisation mass spectrometry (UHPSFC-ESI (+) - MS) was utilised to detect thermally labile and relatively polar compounds which are undetectable by GC-MS, while providing selectivity as the hydrocarbons are not ionised. UHPSFC offers rapid separation and a diesel-compatible, hexane-like CO2 mobile phase.

Different diesels analysed by GC-MS and UHPSFC-ESI (+) - MS were considered to demonstrate differences and similarities.