Results 151 to 160 of about 370 (171)

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

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

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

Russian Journal of Applied Chemistry, 2021
N A Mironov, E G Tazeeva, D V Milordov
exaly  

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

Petroleum Chemistry, 2022
S G Yakubova, G R Abilova, E G Tazeeva
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  

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

Distribution of vanadyl porphyrins in a Mexican offshore heavy crude oil

Fuel Processing Technology, 1996
A Campero
exaly  

ANALYTICAL INVESTIGATIONS OF VANADYL PORPHYRIN FROM CARPATHIAN ROCKS

Environmental Engineering and Management Journal, 2010
Radu-Claudiu Fierascu, Rodica-Mariana Ion, Irina Dumitriu   +2 more
openaire   +1 more source

Influence of the Composition of the Sulfuric Acid Cation Exchanger on the Efficiency of Chromatographic Purification of Petroleum Vanadyl Porphyrins

Russian Journal of Applied Chemistry, 2020
N A Mironov, D V Milordov, E G Tazeeva
exaly