CHARACTERIZATION OF NICKEL AND VANADIUM COMPOUNDS IN TAR SAND BITUMEN BY UV-VIS SPECTROSCOPY AND SIZE EXCLUSION CHROMATOGRAPHY COUPLED WITH ELEMENT SPECIFIC DETECTION
作者:
JohnG. Reynolds,
EdwardL. Jones,
JiliA. Bennett,
WiltonR. Biggs,
期刊:
Fuel Science and Technology International
(Taylor Available online 1989)
卷期:
Volume 7,
issue 5-6
页码: 625-642
ISSN:0884-3759
年代: 1989
DOI:10.1080/08843758908962261
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Previously, we have examined the Ni and V in heavy crude oils, residua, and processed products by several metal speciation techniques to ascertain molecular structure and processing behavior. Two classes of metal compounds were found -metallopetroporphyrins and metallo-nonporphyrins - each having unique reactivity during processing. In efforts to better understand the binding of metals in the oil medium, we have now examined Ni and V in tar sand bitumens, the bitumen was solvent extracted from the sand matrix and was separated by column chromatography and the petro-porphyrin content was quantitated by UV-vis spectroscopy. The petroporphyrin contents ranged from virtually none to over 36% of the total metals. Asphalt Ridge (Utah) has primarily Ni petroporphyrins; Big Clifty (Kentucky) and Athabasca (Canada) have primarily V petroporphyrins; Arroyo Grande and McKittrick (California) have roughly equal amounts of both types; and Surmyside (Utah) has virtually none of either.
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