Renée Webster

Renée Webster
Defence Science and Technology

BSc(Hons) Chemistry

About

20
Publications
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150
Citations
Introduction

Publications

Publications (20)
Article
The influence of sulfur compounds on a fuel's thermal stability has been assessed under ASTM D7739 conditions using a range of jet fuels taken from in-service with known sulfur contents as well as a two component fuel surrogate. It was found that elemental sulfur, benzene sulfonic acid and diphenyl disulfide have the largest impact on sediment form...
Article
Methods to investigate response of hydrocarbons and sulfur compounds to different extents resulting from thermal oxidation of jet fuels refined via the mercaptan oxidation (MEROX) process were developed. Relative comparison of hydrocarbon contents including n-paraffins, iso-paraffins, olefins, naphthenes and aromatics (PIONA) was performed by using...
Article
Jet fuel stability is an important fuel property for management of fuel in storage. A method for predicting jet fuel stability, based on the colourimetric reaction of the stable free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) has been examined in this work. A range of jet fuels of known and unknown refining history, including a range of antioxida...
Article
Nafion solid phase microextraction fibres were prepared and applied to the analysis of polar oxygenated analytes in non-polar aviation fuel matrices. The performance of the Nafion fibres was investigated and exhibited higher extraction efficiencies for polar analytes spiked into a reference non-polar fuel, compared with a commercially available pol...
Article
Oxidation of aviation fuels prior to combustion affects the safe operation of high performance aircraft. This study reports the use of comprehensive two-dimensional gas chromatography (GCGC) with accurate mass time-of-flight mass spectrometry (accTOFMS) to study oxidised species in complex thermally oxidised conventional and alternate aviation fue...
Article
Aviation turbine fuel and diesel fuel were blended with synthetic paraffins produced via two pathways and the combustion properties measured. Both aviation and diesel fuel containing synthetics produced from the fermentation of sugars, had a linear response to blending with decreasing ignition delay times from 5.05 - 3.52 ms for F-34 and 3.84 - 3.5...
Article
Measurement of contamination of marine and naval diesel fuels (arising from product mixing or adulteration) with biodiesel or fatty acid methyl esters can be problematic, especially at very low levels. A suitable solution for this task for trace amounts of individual fatty acid methyl esters was resolution and quantification by using a multidimensi...
Article
Alternative jet fuels and blends are required to meet a minimum aromatic concentration of 8%. It has been proposed that some monoaromatic compounds may make suitable single component aromatics to meet this minimum. One monoaromatic of interest is p-cymene which can be efficiently produced from eucalyptus oil. The oxidative stability of p-cymene and...
Article
Liquid hydrocarbon fuels are complex hydrocarbon mixtures, made even more complex when oxidation reactions produce a variety of oxygenated species. Heart-cut multidimensional gas chromatography coupled with chemical ionisation mass spectrometry was applied to the quantification of alkyldihydrofuranones in several fossil and alternatively-derived je...
Article
Sequential multidimensional gas chromatographic separations were used to identify secondary and tertiary oxidation products in a number of conventional fossil and alternatively-derived aviation fuels. The samples were produced by low temperature thermal oxidation of the fuels, and the higher dimensional separations were required due to the difficul...
Article
Long term storage of aviation turbine fuels often requires the use of antioxidants with many military fuel specifications mandating its addition for hydroprocessed fuels. This work examines the influence of antioxidants on aged and freshly refined aviation turbine fuels of various types, some containing antioxidant at manufacture and others not. Th...
Article
Methods for the selective determination and quantification of 10 synthetic phenolic antioxidants (SPA) in jet and diesel fuels have been developed. The analytical procedure involves no sample preparation and uses direct injection of the diluted parent fuel into the GC column. Gas chromatography with both triple quadrupole and quadrupole time-of-fli...
Article
Thermal stressing experiments out up to 180 °C have demonstrated that "fit for purpose" testing such as water separability (MSEP), particle counting (ISO 4406) and JFTOT have been impacted when subjected to repeated thermal stress. Initial results indicate a reduction of up to 80 °C in the breakpoint temperature of stressed fuel can occur after a r...
Article
The identification of aircraft hydraulic fluid contamination of turbine engine oils is difficult. Repeated field incidents of this type of cross contamination have led to the requirement to develop a method suitable for quantitation of such contamination. A gas chromatography–chemical ionisation mass spectrometry method for the determination of H-5...
Article
To characterize a fuel's thermal and storage stability an understanding of the process of oxidation and oxidation pathways is essential. Oxidation pathways commence with hydroperoxides which quickly decompose to form a range of alcohols, acids and other oxygen-containing species. In the presence of significant levels of hydrocarbon-based matrix, an...
Article
Thermal stressing experiments on a modified surrogate fuel and synthetic paraffinic kerosene (SPK) have been carried out under both static and dynamic conditions at 140 °C. In order to characterize the oxidation products, some key degradation compounds were monitored throughout the stressing experiment. Products resulting from ring closure reaction...
Article
Thermal stressing experiments on a modified surrogate fuel and HRJ JP-5 have been carried out under both static and dynamic conditions. Dynamic thermal stressing of the surrogate fuel at 140 °C and 18600 kPa with a residence time of 55 seconds gave significant levels of oxidation with detectable amounts of ketones being formed. To characterise the...

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