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Study on the Surface Functional Groups of Asphaltenes Pre- and Post-Hydrotreating in Different Reaction Systems
Yudong Sun1, Zezhou Wang2, Ziyuan Liu1
1College of Chemistry & Chemical Engineering, China University of Petroleum(East China), Qingdao 266580, China.
None:
The surface functional groups of asphaltenes pre- and post-hydrotreating in different reaction systems were investigated by X-ray photoelectron spectroscopy (XPS). The asphaltenes were separated by different solvents from the Yumen atmospheric residue (YMAR) and the Merey atmospheric residue (MRAR) pre- and post-hydrotreating in the residue and decalin. The results show that asphaltene is mainly composed of carbon, sulfur, nitrogen, and oxygen in addition to hydrogen. The carbon atoms exist in the forms of sp2 and sp3, but there are fewer carbon atoms combined with oxygen atoms in asphaltene. Oxygen mainly exists in the forms of ketonic oxygen, carbon-oxygen single bond, and carboxyl oxygen in asphaltene. The carbon-oxygen single bond is the main existing form of oxygen, and the ketonic oxygen decreases in hydrotreated asphaltene. The nitrogen is mainly pyrrole nitrogen in asphaltene, the pyrrole nitrogen further increases, and the pyridine nitrogen is reduced to less than one-third after hydrotreating. Alkyl sulfur is higher than thiophene sulfur in proto-asphaltene. Although the content of thiophene sulfur is increased in hydrotreated asphaltene, alkyl sulfur still dominates.
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