Molecular Characterization of Nickel and Vanadium Nonporphyrin Compounds Found in Heavy Crude Petroleums and Bitumens

Fish, Richard H.; Reynolds, John G.; Gallegos, Emilio J.

doi:10.1021/bk-1987-0344.ch021

Cited by 15 publications

(8 citation statements)

References 9 publications

(11 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the concentration studied (1000 mg L –1 in THF), the vanadium and nickel compounds present in the TC from Hamaca asphaltenes were not detected. The absence or presence of trapped V and Ni compounds (porphyrin or not porphyrin) in the asphaltenes might obey to crude oil geochemical origin. , An interesting aspect to be focused on, is that until now the method that allows recovery of trapped porphyrins is the asphaltene PNP fractionation. So, this opens the possibility to obtain vanadium compounds from asphaltene samples.…”

Section: Discussionmentioning

confidence: 99%

Study of Very High Molecular Weight Cluster Presence in THF Solution of Asphaltenes and Subfractions A1 and A2, by Gel Permeation Chromatography with Inductively Coupled Plasma Mass Spectrometry

et al. 2020

View full text Add to dashboard Cite

Super high-molecular-weight (SHMW) asphaltene aggregates, hereafter called asphaltene clusters, have been observed for the first-time using gel permeation chromatography with inductively coupled plasma mass spectrometry (GPC-ICP HR MS). Presumably these clusters are composed by nanoaggregates joined by physical interactions such as polar and dispersion forces. These clusters were observed for three asphaltenes samples (Hamaca, Cerro Negro and Boscan) and in their corresponding subfractions, A1 (insoluble in toluene) and A2 (soluble in toluene). Under the present conditions, dilution experiments showed no significant change of these profiles suggesting that these clusters, as well as the other lower molecular weight (LMW) aggregates and molecules are not in equilibrium with each other and behave as independent units. This is supported by the presence of trapped compounds within asphaltenes (TC) which are released after the p-nitrophenol treatment. A temperature cycle was implemented to monitor possible changes of GPC-ICP HR MS profiles with temperature. Here Boscan samples were heated from 25 to 200 °C, left standing by for 24 h and then cooled back to 25 °C before measurement. Whereas we found small changes for Boscan asphaltenes (As-Bo), vast changes in the profiles were detected for A1-Bo and A2-Bo subfractions, and these disclose interchange of material between the cluster and the other components of the solution. These results are discussed in terms of different arrays that may result when asphaltenes are separated in the two subfractions, and nanoaggregates are relocated within the cluster before and after heating. Preliminary molecular dynamics calculation afforded intensity-size distribution coherent with the usual experimental GPC chromatography profiles.

show abstract

Section: Discussionmentioning

confidence: 99%

Study of Very High Molecular Weight Cluster Presence in THF Solution of Asphaltenes and Subfractions A1 and A2, by Gel Permeation Chromatography with Inductively Coupled Plasma Mass Spectrometry

et al. 2020

View full text Add to dashboard Cite

show abstract

“…If the vanadium and nickel contents of crude oil are measured and compared with porphyrin concentrations, it is usually found that not all the metal content can be accounted for as porphyrins, based on UVevisible extinction coefficients (Fish et al, 1987). In some crude oils, as little as 10% w/ w of total metals appears to be part of the porphyrin structures.…”

Section: Mineralogical Components and Petrographic Determinationsmentioning

confidence: 99%

New evidence of adhesive as hafting material on Middle and Upper Palaeolithic artefacts from Gura Cheii-Râşnov Cave (Romania)

Cârciumaru

Ion

Nițu

et al. 2012

Journal of Archaeological Science

View full text Add to dashboard Cite

“…However, they can also be linked or trapped in other types of macromolecular networks [2]. Several groups have isolated [8][9][10] and determined the structure of free porphyrins from geological sources (e.g., crude oils, oils shales, and coal) [11][12][13][14][15]. Those porphyrins were free bases or metal complexes,particularly involving Ni and V as V=O.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, examining these compounds without interference from each other has been impossible. To separate the different classes of compounds, HPLC has been coupled with graphite furnace atomic absorption spectroscopy [8,9], inductively coupled plasma atomic emission spectrometry (ICP-AES) and ICP mass spectrometry (ICP-MS) [3].…”

Section: Introductionmentioning

confidence: 99%

Development of a chromatographic methodology for the separation and quantification of V, Ni and S compounds in petroleum products

Vargas

Castillo

Ocampo-Torres

et al. 2017

Fuel Processing Technology

View full text Add to dashboard Cite

Additionally, the use of ultraviolet (UV)-visible spectroscopy allows the identification of fractions containing porphyrinic-type compounds by detecting the Soret band at 405 nm.The correlation between this two-step approach is to deduce both the distribution and nature of Ni and V complexes within the sample.This method reduces the complexity of petroleum matrices and producessimpler fractionsthat can be used for further studies.

show abstract

Molecular Characterization of Nickel and Vanadium Nonporphyrin Compounds Found in Heavy Crude Petroleums and Bitumens

Cited by 15 publications

References 9 publications

Study of Very High Molecular Weight Cluster Presence in THF Solution of Asphaltenes and Subfractions A1 and A2, by Gel Permeation Chromatography with Inductively Coupled Plasma Mass Spectrometry

Study of Very High Molecular Weight Cluster Presence in THF Solution of Asphaltenes and Subfractions A1 and A2, by Gel Permeation Chromatography with Inductively Coupled Plasma Mass Spectrometry

New evidence of adhesive as hafting material on Middle and Upper Palaeolithic artefacts from Gura Cheii-Râşnov Cave (Romania)

Development of a chromatographic methodology for the separation and quantification of V, Ni and S compounds in petroleum products

Contact Info

Product

Resources

About