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Since the production of crude oil may not meet the increasing demand in the next future, coal liquefaction products have sparked great interest as one of the possible substitutes of petroleum in the transportation field. Speciation of oxygen in direct coal liquefaction products is essential considering the important role of oxygenated compounds in coal conversion reactions. This study attempts to...
The new multidimensional chromatographic instrument SFC-GC×GC enables the temporary storage of SFC fractions inside sampling loops for subsequent analyses by GC×GC. The interface was configured for the characterization of heavy petroleum fractions. The SFC dimension was adapted to perform a group type separation into saturated, unsaturated and polar fractions. The GC×GC dimension was set in order...
The study focuses on the analytical characterization of resin fractions from vacuum gas oils (VGO) obtained by LC fractionation. These complex matrices are often considered as containing polar compounds, but are rather defined by their physico-chemical properties than by their chemical structures. Therefore resin fractions remain almost unknown. Owing to the energetic context, which imposes to convert...
Conventional comprehensive two-dimensional gas chromatography (2D-GC or GC×GC) is now widely used for middle distillates analysis; only a few applications are devoted to heavy fractions such as vacuum gas oils or vacuum residues. A recent extension of GC×GC range in suitable high temperature conditions allowed quantitative analysis of a full vacuum gas oil (VGO) up to nC 60 . Considering this...
The molecular knowledge of nitrogen compounds in diesel feedstocks has become a key issue in the development of hydrotreatment processes, especially for ultra-low sulfur diesel production. Indeed, nitrogen species have a strong impact on the hydrodesulfurization (HDS) pathway, since basic nitrogen is known to poison acidic sites of HDS catalysts.Since conventional methods only allow a poor degree...
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