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Energies 2012, 5(3), 741-751;

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 / Revised: 4 March 2012 / Accepted: 6 March 2012 / Published: 14 March 2012
(This article belongs to the Special Issue Biomass and Biofuels 2012)
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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. View Full-Text
Keywords: bio-oil; lubrication property; emulsion; four-ball tester; SEM; XPS bio-oil; lubrication property; emulsion; four-ball tester; SEM; XPS

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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.

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