Results 1 to 10 of about 225 (136)

The kerogen vanadyl porphyrins: incorporation during catagenesis [PDF]

Journal of the Serbian Chemical Society, 1999
Natural vanadyl (VO2+)-deoxophylloerythroetioporphyrins (DPEP) have been shown to be capable of reacting and quantitatively incorporating into immature kerogen model materials (torbanite, lignites, subbituminous coal and immature lacustrine kerogen) at ...
MIROSLAV P. PREMOVIC, DRAGAN M. DJORDJEVIC, IVANA R. TONSA, PAVLE I. PREMOVIC   +3 more
doaj   +3 more sources

Postdiagenetic Bacterial Transformation of Nickel and Vanadyl Sedimentary Porphyrins of Organic-Rich Shale Rock (Fore-Sudetic Monocline, Poland) [PDF]

Frontiers in Microbiology, 2021
Nickel and vanadyl porphyrins belong to the so-called fossil geo- or sedimentary porphyrins. They occur in different types of organic matter-rich sediments but mostly occur in crude oils and their source rocks, oil shales, coals, and oil sands.
Robert Stasiuk, Renata Matlakowska
doaj   +2 more sources

Radicals on the silica surface: probes for studying dynamics by means of fast field cycling relaxometry and dynamic nuclear polarization [PDF]

Magnetic Resonance Letters, 2023
Determining the dynamics of adsorbed liquids on nanoporous materials is crucial for a detailed understanding of interactions and processes on the solid-liquid interface in many materials and porous systems.
Bulat Gizatullin, Carlos Mattea, Siegfried Stapf   +2 more
doaj   +2 more sources

Magnetic expression in kerogen reveals impact on fluid transport [PDF]

Magnetic Resonance, 2022
How can the transport of fluids in a confined and complex mixed organic/inorganic matrix be far below the expected value from a topological aspect? A good example of this situation is oil shales.
B. Nicot, J.-P. Korb, I. Jolivet, H. Vezin, D. Gourier, A.-L. Rollet   +5 more
doaj   +2 more sources

Light-Activated Qubit Coupling in a Vanadyl Porphyrin Trimer. [PDF]

J Am Chem Soc
Molecules provide a modular and chemically tunable platform for quantum information science. In recent years, significant advances have been made in enabling optical spin initialization, coherent control, and both optical and electrical readout of molecular qubits.
Privitera A, Chiesa A, Santanni F, Ranieri D, Sahu PP, Krzyaniak MD, Caneschi A, Young RM, O Senge M, Totti F, Wasielewski MR, Carretta S, Sessoli R.   +12 more
europepmc   +4 more sources

Air oxidation of the kerogen/asphaltene vanadyl porphyrins: an electron spin resonance study [PDF]

Journal of the Serbian Chemical Society, 2000
The thermal behavior of vanadyl porphyrins was studied by electron spin resonance during heating of kerogens, isolated from the La Luna (Venezuela) and Serpiano (Switzerland) bituminous rocks, at 25°C for 1 to 20 days in the presence of air.
MIRJANA S. PAVLOVIC, DRAGAN M. DJORDJEVIC, IVANA R. TONSA, PAVLE I. PREMOVIC   +3 more
doaj   +2 more sources

HYSCORE Spectroscopy to Resolve Electron–Nuclear Structure of Vanadyl Porphyrins in Asphaltenes from the Athabasca Oil Sands In Situ Conditions

Energies, 2022
The purpose of this work is to analyze the electron–nuclear interactions of the vanadyl-porphyrin (VP) complexes in oil asphaltenes. Asphaltenes from the Athabasca oil sands were studied by HYperfine Sublevel CORrelation Spectroscopy (HYSCORE) electron ...
Margarita A. Sadovnikova, Fadis F. Murzakhanov, Georgy V. Mamin, Marat R. Gafurov   +3 more
doaj   +1 more source

Preliminary Assessment of the Generative Potential of Crude Oil Samples From Three (3) Offshore Exploration Oil Wells in Nigeria

Journal of Basic and Applied Research in Biomedicine, 2022
Oil generating potential of virgin crude oil samples procured from wells within the Southern part of Nigeria was employed in this study. The work aimed at characterizing the organic matter, determining the quality, analyzing the quality status as well ...
Esther Sunday, A Israel
doaj   +2 more sources

ENDOR study of nitrogen hyperfine and quadrupole tensors in vanadyl porphyrins of heavy crude oil [PDF]

Magnetic Resonance in Solids, 2016
We report the observation of pulsed electron-nuclear double resonance (ENDOR) spectrum caused by interactions of the nitrogen nuclei 14N with the unpaired electron of the paramagnetic vanadyl complexes VO2+ of vanadyl porphyrins in natural crude oil.
Gracheva I.N., Gafurov M.R., Mamin G.V., Biktagirov T.B., Rodionov A.A., Galukhin A.V., Orlinskii S.B.
doaj  

Behaviour of Vanadyl Porphyrin Complexes on TLC

, 1982
Indian Institute of Petroleum, Dehra Dun-248 005 Manuscript received 23 April 1980, accepted 7 June 1982 The behaviour of a vanadium porphyrin complexes concentrate obtained from Darius crude oil has been studied on tic using a variety of solvent combinations and silica gel as the adsorbent.
(Miss) S. CHAKRABORTY, V. K. BHATIA
openaire   +2 more sources