Author:
Semple Kathleen M.,Cyr Natsuko,Fedorak Phillip M.,Westlake Donald W. S.
Abstract
Asphaltenes from Cold Lake oil were separated into fractions by size exclusion chromatography to study the molecular size dependence of chemical structural characteristics. Each fraction was analyzed by proton NMR and UV–visible spectroscopy and by elemental analyses for C, H, N, S, Ni, and V. The results indicated that the nature of the average chemical structures in Cold Lake asphaltenes were not uniform throughout the total range of molecular sizes but varied significantly; some changed gradually and some changed quite abruptly. Especially in the very low molecular-weight fraction, the size of aromatic moieties seems to be much smaller, the contents of both aromatic carbon and aromatic hydrogen are higher, the C/H ratio is higher, and the porphyrin and vanadium concentrations are much higher than in heavier fractions. Keywords: Cold Lake asphaltenes, size fractionation, vanadium, proton NMR, porphyrin, chemical structural analysis.
Publisher
Canadian Science Publishing
Subject
Organic Chemistry,General Chemistry,Catalysis
Cited by
49 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献