Upgrading Study On Catalytic Hydrotreatment Of Bio-oil

Energy is an important material foundation for human survival and long-term stable development. With lots of exploitation, non-renewable fossil fuels will be exhausted inevitably. The decrease of fossil fuels and increase of serious environmental pollution problems promote the rapid development of renewable energy sources.Bio-oil, as renewable energy, attracts widespread attention. But bio-oil contains high water and oxygen content including phenol, aldehyde, ketone, ether, furan, etc, which leads to some unfavourable properties, such as chemical instability, low heating value, immiscibility and corrosiveness. So it cannot be used directly to the current power machinery equipment and necessarily needs to selectively remove oxygen by hydrodeoxygenation(HDO) to improve the quality of bio-oil in order to meet the standards of clean fuels. Thus, the key of upgrading bio-oil is to decrease oxygen content and increase H/Ceff and heat value. Presently, the used HDO catalysts are noble metal catalysts, nickel-based catalysts, sulphide catalysts and phosphide catalysts.Catalytic hydrotreatment is an important method of upgrading bio-oil. In this paper, two-step catalytic hydrogenation of bio-oil by Pt/C was investigated for saturated a lcohols as liquid fuel. At the first mild step(80 °C, 2 h, 2 MPa H2, 800 rpm, 0.15 g 5 wt.% Pt/C), the main target was to saturate compone nts with carbon-carbon double bonds and aldehyde groups. At the second deep step(3 h, 4 MPa H2, 800 rpm, 0.25 g 5 wt.% Pt/C), 270°C were explored and found to be the best condition, obtained a high alcohol content, 85.38%.We discuss the differences between one-step and two-stage catalytic hydrogenation and then optimize the process conditions of upgrading bio-oil with Pt/C. Lastly, N i-SiO2/Al2O3 and mixed solvents(ethanol and ethylene glycol) are investigated for catalytic hydrogenation of bio-oil. And this research make preparations for kinetic modeling, preparation of efficient catalysts and develop low-cost refining process route.