Molecular Structure Models of Asphaltene in Crude and Upgraded Bio‐Oil |
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| Authors: | Qingli Xu Zhikai Zhang Suping Zhang Fu Wang Yongjie Yan |
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| Affiliation: | East China University of Science and Technology, Research Center for Biomass Energy, Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai, China. |
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| Abstract: | The average molecular formula of asphaltene was calculated from the main functional groups of asphaltene determined by Fourier transform infrared spectroscopy, the average molecular weight found by gel filtration chromatography, and values of ultimate analysis. A series of average structure parameters were determined by 1H NMR and 13C NMR spectrum integrals, followed by establishing the structure models of asphaltene according to the Brown‐Ladner method. Reduction of molecular weight of asphaltene was observed after bio‐oil upgrading, and the oxygen‐containing functional groups were apparently less than that of crude bio‐oil while the number of aromatic rings was increased. The upgraded bio‐oil had a lower molecular weight, lower oxygen content, and higher aromaticity compared with crude bio‐oil. |
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| Keywords: | Asphaltene Catalytic hydrogenation Crude bio‐oil Upgraded bio‐oil |
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