Asphaltenes, complex aromatic compounds from various carbonaceous sources, could be
obtained by solvent dissolution, filtration and adsorption. It was difficult to clarify the …

Asphaltene is the most complex component of crude oil, consisting of various molecular
structures, eg, different molecular weights and number of rings per fused-ring system (or …

There has been a recent surge in the development of mass spectrometric methods for
detailed characterization of naphthenic acid fraction compounds (all CcHhNnOoSs, species …

Given the ill-defined term “naphthenic acids”(NAs), we will classify NAs as the carboxylic
acids found naturally in crude oil, which include both classic NAs (c-NAs, monoacids) and ox …

Among the different types of available high-resolution mass spectrometers, Fourier transform
ion cyclotron resonance mass spectrometry (FT-ICR MS) and Orbitrap-MS are important …

Asphaltenes can be considered like the 'bad guys 'when heavy petroleum are transported or
upgraded. These compounds are not classified by the their chemical structures but by the …

Bio-oils of pine wood and sugarcane bagasse were obtained in different conditions of
thermal and catalytic pyrolysis. They were analyzed by hydrogen nuclear magnetic …

252 literature sources and about 5000 crude oil assays were reviewed in this work. The
review has shown that the petroleum characterization can be classified in three categories …

The inclusion of preliminary chemical labeling (derivatization) in the analysis process by
such powerful and widespread methods as electrospray ionization (ESI) and matrix-assisted …

Asphaltenes analysis still remains a challenge due to their unknown molecular structure and
self-associative behavior. FT-ICR MS analyses using five different ionization methods, ESI …