Characterization of the binding sites of vanadium compounds in heavy crude petroleum extracts by electron paramagnetic resonance spectroscopy

Journal Article · · Energy Fuel; (United States)

DOI:https://doi.org/10.1021/ef00001a007· OSTI ID:6565928

Reynolds, J G; Gallegos, E J; Fish, R H; Komlenic, J J

The high-performance liquid chromatographic (HPLC) separated fractions of pyridine/water extracts of selected crude petroleums were analyzed by electron paramagnetic resonance (EPR) spectroscopy to determine the first coordination sphere around the vanadium. The extracts were separated by polarity on an octadecylsilane column (ODS) into three fractions - low, moderate, and high polarity. As determined by EPR, the Boscan moderate-polar and Prudhoe Bay moderate- and low-polar fractions exhibited N/sub 2/S/sub 2/ coordination. Cerro Negro and Wilmington moderate-polar fractions showed S/sub 4/ coordination, and the Boscan low-polar fraction showed N/sub 4/ coordination. The coordination of the Cerro Negro low-polar fraction had distinctly different parameters, showing a NOS/sub 2/ coordination. These results are important in the identification of non-porphyrin metal-containing compounds in heavy crude petroleums and residua. 74 references, 6 figures, 3 tables.

• Research Organization: Chevron Research Co., Richmond, CA
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6565928
• Journal Information: Energy Fuel; (United States), Vol. 1:1
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
PETROLEUM FRACTIONS
STRUCTURAL CHEMICAL ANALYSIS
VANADIUM COMPOUNDS
CHEMICAL ANALYSIS
CHEMICAL BONDS
CHEMICAL COMPOSITION
ELECTRON SPIN RESONANCE
LIQUID COLUMN CHROMATOGRAPHY
MOLECULAR STRUCTURE
CHROMATOGRAPHY
ENERGY SOURCES
FOSSIL FUELS
FUELS
MAGNETIC RESONANCE
PETROLEUM
RESONANCE
SEPARATION PROCESSES
TRANSITION ELEMENT COMPOUNDS
023000* - Petroleum- Properties & Composition