Results 61 to 70 of about 370 (171)

Characterization of Vanadyl and Nickel Porphyrins Enriched from Heavy Residues by Positive-Ion Electrospray Ionization FT-ICR Mass Spectrometry

, 2015
Petroporphyrins were enriched and purified from atmospheric residues of two typical heavy oils, Canadian oil sand bitumen (OSAR: Ni, 80 ppm; V, 190 ppm; S, 3.97 wt %) and Chinese Liaohe heavy oil (LHAR: Ni, 68.7 ppm; V, 1.81 ppm; S, 0.36 wt %) by silica ...
Zongxian Wang (1363437), Quan Shi (1261062), Aijun Guo (1363440), Jincheng Lu (1356474), Shunfeng Ji (1363434), Jun Mu (544952), Kun Chen (131048), He Liu (67509)   +7 more
core   +1 more source

Compositional Trends for Total Vanadium Content and Vanadyl Porphyrins in Gel Permeation Chromatography Fractions Reveal Correlations between Asphaltene Aggregation and Ion Production Efficiency in Atmospheric Pressure Photoionization

, 2020
International audienceFourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) has exposed the ultracomplexity of fossil fuels, thereby validating the compositional trends that rule petroleum distillation, known as the Boduszynski ...
Barrère-Mangote, Caroline, Blakney, Greg, Weisbrod, Chad, Bouyssière, Brice, Moulian, Rémi, Chacón-Patiño, Martha, Putman, Jonathan, Rodgers, Ryan, Giusti, Pierre   +8 more
core   +1 more source

An exchange coupled meso-meso linked vanadyl porphyrin dimer for quantum information processing. [PDF]

Chem Sci, 2022
Ranieri D, Santanni F, Privitera A, Albino A, Salvadori E, Chiesa M, Totti F, Sorace L, Sessoli R.   +8 more
europepmc   +1 more source

High-Purity Vanadyl Petroporphyrins: Their Aggregation and Effect on the Aggregation of Asphaltenes

, 2019
Small-angle neutron scattering (SANS) is used to characterize the aggregation of pure vanadyl petroporphyrins (VOPPs), as well as of asphaltenes mixed with either VOPPs or synthetic porphyrins.
B. McKay Rytting (5118014), Michael R. Harper (2255398), Yunlong Zhang (112004), Kazem V. Edmond (2235256), Peter K. Kilpatrick (2315134), B. McKay Rytting, Yunlong Zhang, Michael R. Harper, Kazem V. Edmond, Peter K. Kilpatrick   +9 more
core   +1 more source

Molecular Dynamics and Proton Hyperpolarization via Synthetic and Crude Oil Porphyrin Complexes in Solid and Solution States

, 2021
The use of vanadyl porphyrins either in synthetic compounds or naturally occurring in asphaltenes is investigated as a source of proton hyperpolarization via dynamic nuclear polarization (DNP) in nuclear magnetic resonance (NMR) experiments. The features
Mattea C., Stapf S., Gafurov M., Gizatullin B., Murzakhanov F., Vakhin A.   +5 more
core  

EPR, ENDOR, and HYSCORE study of the structure and the stability of vanadyl−porphyrin complexes encapsulated in silica: potential paramagnetic biomarkers for the origin of life

, 2010
The possibility of using vanadyl ions as paramagnetic biomarkers for the identification of traces of primitive life fossilized in silica rocks is studied by cw-EPR, ENDOR, HYSCORE, and DFT calculations.
Vezin, H., Binet, L., Bonduelle, A., Delpoux, O., Gourier, D., Ciofini, I.   +5 more
core   +1 more source

Hydrodevanadization of Vanadyl Porphyrin by Tetralin

Journal of The Japan Petroleum Institute, 1981
Hiroshi KAMEYAMA, Masami SUGISHIMA, Muneyoshi YAMADA, Akira AMANO   +3 more
openaire   +2 more sources

Density functional theory investigation of the effect of axial coordination and annelation on the absorption spectroscopy of nickel(II) and vanadyl porphyrins relevant to bitumen and crude oils

, 2013
The vanadium and nickel components in heavy oils and bitumen are important impurities in catalytic processing and form aggregates with other asphaltene components.
Gusarov, Serguey, Stryker, Jeffrey M., Gray, Murray R., Kovalenko, Andriy, Stoyanov, Stanislav R., Yin, Cindy-Xing   +5 more
core   +1 more source

Impact of N, O Heteroatoms in Asphaltene on Adsorption of Vanadyl/Nickel Etioporphyrin. [PDF]

ACS Omega, 2022
Chen F, Wang Q, Zhang L, Zhu Q.
europepmc   +1 more source

Asphaltenes: Aggregates in Terms of A1 and A2 or Island and Archipielago Structures. [PDF]

ACS Omega, 2023
Acevedo S, Castillo J.
europepmc   +1 more source