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Lubrication Properties of Bio-Oil and Its Emulsions with Diesel Oil
National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
* Author to whom correspondence should be addressed.
Received: 23 January 2012; in revised form: 4 March 2012 / Accepted: 6 March 2012 / Published: 14 March 2012
Abstract: Bio-oil from fast pyrolysis of biomass is a low-grade liquid fuel, which can be upgraded through the emulsification with diesel oil. In this study, we prepared two rice husk bio-oil samples with different solid char contents and three bio-oil/diesel-oil emulsion samples with the bio-oil content of 10 wt%, 30 wt% and 50 wt%, respectively. The lubrication properties of these oil samples were evaluated by a four-ball tester. The morphologies of the worn ball surface were observed by scanning electron microscope (SEM). The chemical states of the elements on the worn surface and non-worn surface were analyzed by X-ray photoelectron spectroscope (XPS). The results showed that the bio-oil possessed better extreme-pressure, anti-wear and friction-reducing properties than the commercial diesel oil (number zero). The solid char particles in the bio-oil could improve its lubrication performance. Moreover, the lubrication ability of the emulsions would be enhanced with the increasing of the bio-oil content in the emulsions.
Keywords: bio-oil; lubrication property; emulsion; four-ball tester; SEM; XPS
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MDPI and ACS Style
Lu, Q.; Zhang, Z.-B.; Liao, H.-T.; Yang, X.-C.; Dong, C.-Q. Lubrication Properties of Bio-Oil and Its Emulsions with Diesel Oil. Energies 2012, 5, 741-751.
Lu Q, Zhang Z-B, Liao H-T, Yang X-C, Dong C-Q. Lubrication Properties of Bio-Oil and Its Emulsions with Diesel Oil. Energies. 2012; 5(3):741-751.
Lu, Qiang; Zhang, Zhi-Bo; Liao, Hang-Tao; Yang, Xiao-Chu; Dong, Chang-Qing. 2012. "Lubrication Properties of Bio-Oil and Its Emulsions with Diesel Oil." Energies 5, no. 3: 741-751.