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

Abstract

The composition of purified vanadyl porphyrins recovered from the resins of heavy oils possessing high and low vanadium contents was investigated. Vanadium content in the resins of the heavy oils under study differs by a factor of ca. 15. To recover and purify vanadyl porphyrins from the resins, extraction by N,N–dimethylformamide (DMF) with subsequent two-stage column chromatography on silica gel and sulfocationite were employed. The change of structural-group composition and content of vanadyl porphyrins in the products obtained at each stage was evaluated using Fourier IR and UV-Vis spectroscopy. Analysis of the purified vanadyl porphyrins using MALDI mass spectrometry determined distribution of their most abundant types (etio- and DPEP) and identified C27–C39 homologs for the resins possessing high vanadium content and C28–C39 homologs for the resins with low vanadium content.

Molecular And Solid‐State Structure Of Oxovanadium(IV) Etioporphyrin‐III

“…The spectrum consists of a weak broad band close to the UV edge of the visible, a very large and narrow Soret-band peaked at 408 nm, and a doublet of weak Q-bands at 532/570 nm. [2,31,42] In the solutions of the stock VO-EtioP-III compound studied in Ref. [23] the narrow band appearing at 414 nm was also identified by the authors as the Soret band (absorption in the range from 200 to 270 nm was due to the acetone solvent), and two much smaller bands at 530 and 569 nm were assigned to Q-bands.…”

“…Solutions in common organic solvents, such as chloroform, toluene, hexane or mineral oils have a purple color and obey the Beer law (Figure S7, S8). The spectrum consists of a weak broad band close to the UV edge of the visible, a very large and narrow Soret‐band peaked at 408 nm, and a doublet of weak Q‐bands at 532/570 nm [2,31,42] . In the solutions of the stock VO‐EtioP‐III compound studied in Ref.…”

“…Complexes of vanadium with porphyrin ligands are the most abundant metalorganic chelates found in the fossil fuels of various kinds. [1][2][3][4][5][6][7][8][9] Among the porphyrin ligands, the etio-type (i. e. alkyl-porphyrin) is the simplest: a classical EtioP ligand bears four methyl and four ethyl groups attached to the outer C β atoms in each pyrrole unit. Hence, four position isomers are possible for etioporphyrin ligand, being commonly labeled by Roman numbers.…”

“…Complexes of vanadium with porphyrin ligands are the most abundant metalorganic chelates found in the fossil fuels of various kinds [1–9] . Among the porphyrin ligands, the etio ‐type ( i. e .…”