Results 111 to 120 of about 225 (136)

Nickel and vanadyl porphyrins in Saudi Arabian crude oils

Energy & Fuels, 1993
This study reports the isolation and characterization of nickel and vanadyl porphyrins in the residue (535 °C+) and asphaltenes from Arabian Heavy crude oil. The residue was obtained by distillation of crude oil, whereas the asphaltenes were precipitated by n-heptane from the crude oil.
Mohammad F. Ali, H. Perzanowski, A. Bukhari, Adnan A. Al-Haji   +3 more
openaire   +1 more source

Observation of vanadyl porphyrins and sulfur‐containing vanadyl porphyrins in a petroleum asphaltene by atmospheric pressure photonionization Fourier transform ion cyclotron resonance mass spectrometry

Rapid Communications in Mass Spectrometry, 2008
Abstract Vanadyl (VO) porphyrins and sulfur‐containing vanadyl (VOS) porphyrins of a wide carbon number range (C 26 to C 52 ) and Z‐number range (−28 to −54) were detected and identified in a petroleum asphaltene by atmospheric ...
Kuangnan, Qian, Anthony S, Mennito, Kathleen E, Edwards, Dave T, Ferrughelli   +3 more
openaire   +2 more sources

The structure of vanadyl porphyrins of petroleum

Petroleum Chemistry U.S.S.R., 1980
A SHULGA, T MOZZHELINA, O SEREBRENNIKOVA, V TITOV   +3 more
openaire   +1 more source

Electrochemistry of vanadyl porphyrins in dimethylformamide

Inorganic Chemistry, 1988
Karl M. Kadish, D. Sazou, C. Araullo, Y. M. Liu, A. Saoiabi, M. Ferhat, R. Guilard   +6 more
openaire   +1 more source

A Comparative Analysis of Vanadyl Porphyrins Isolated from Resins of Heavy Oils with High and Low Vanadium Content

Processes, 2021
Svetlana Yakubova, Elvira Tazeeva, Damir Tazeev   +2 more
exaly  

Adsorption-Extrographic Preconcentration of Petroleum Vanadyl Porphyrins from Dimethylformamide Extract of Heavy Petroleum Asphaltenes

Russian Journal of Applied Chemistry, 2021
Elvira Tazeeva, Milordov D V, Abilova G R   +2 more
exaly  

A Comparative Analysis of Vanadyl Porphyrins Isolated from Heavy Oil Asphaltenes with High and Low Vanadium Content

Petroleum Chemistry, 2022
Svetlana Yakubova, Elvira Tazeeva, Damir Tazeev   +2 more
exaly  

Diffusivity and hydrogenation of vanadyl porphyrins in the synthesized NiMo/Zr-SBA-15 and industrial NiMo/γ-Al2O3 catalysts

Chemical Engineering Science, 2022
Zhentao Chen
exaly  

Vanadyl porphyrins in sedimentary kerogens/asphaltenes: Estimation of the concentration

1999
A new, rapid method for determining the concentration of vanadyl porphyrins (VO2+-P) associated with the kerogen of bituminous sedimentary rocks, using electron spin resonance (ESR) is described. The method is simple, straightforward and inexpensive. Several concentrations of a vanadyl (VO2+) standard dissolved in glycerol/lignite mixture were prepared.
Premović, Pavle I., Allard, Thierry, Nikolić, Nikola D., Tonsa, Ivana R., Pavlović, Mirjana S.   +4 more
openaire   +1 more source

The Kinetics of Porphyrin Hydrodemetallation. 2. Vanadyl Compounds

Industrial & Engineering Chemistry Process Design and Development, 1980
Chi-Wen Hung, James Wei
openaire   +1 more source