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Catalytic Upgrading of Pyrolysis Oil to Transportation Fuels

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dc.contributor.advisor Mahajan, Devinder en_US
dc.contributor.advisor Krishna, C. R en_US
dc.contributor.author Nan, Wei en_US
dc.contributor.other Department of Materials Science and Engineering. en_US
dc.date.accessioned 2017-09-20T16:50:03Z
dc.date.available 2017-09-20T16:50:03Z
dc.date.issued 2014-12-01 en_US
dc.identifier.uri http://hdl.handle.net/11401/76334 en_US
dc.description 119 pg. en_US
dc.description.abstract Increasing fossil fuel prices and the demand for clean energy have accelerated research on renewable energy sources. Pyrolysis oil (also known as bio-oil) which can be derived from lignocellulosic biomass by a fast pyrolysis process has the potential to substitute for petroleum-derived transportation fuels. However, pyrolysis oil has lower energy density (15-19 MJ/kg), compared with petroleum (40 MJ/kg) due to the high oxygen content (30-60 wt %). Furthermore, pyrolysis oil is thermally unstable that tends to age and results in phase separation at room temperature. Therefore, upgrading of pyrolysis oil is necessary before it can be used as a transportation fuel. Hydrotreating is an effective option to upgrade pyrolysis oil to generate hydrocarbons. However, the conventional process requires elevated temperatures and pressure of H2 to ensure a high level of deoxygenation. At high temperatures, coke formation by polymerization of hydroxyphenols or methoxyphenols in pyrolysis oil has been observed as the main factor affecting the stability of the catalysts. In addition, catalytic upgrading under a high temperature increased the carbon loss to CO2 and CH4. Thus, a more economical method is needed. Our efforts to carry out hydrodeoxygenation (HDO) at relatively mild conditions to produce alcohols and hydrocarbon fuels over various supported catalysts are reported here. Different solvents have been tried to ease the problems of high viscosity and thermal instability of pyrolysis oil, clogging of reactors, considerable coking, and catalyst deactivation. The highest gas yield of HDO of pyrolysis oil was 21.1 NL/kg and the gas phase generated during upgrading had 70-85% CO2, which indicated that the oxygen in the pyrolysis oil was successfully removed. Acetic acid content decreased from 3.85 wt% to below 0.01 wt% after HDO. FT-IR data reveals that alcohols tend to be produced at lower temperatures and alkene C=C stretching vibration was found in the IR data of the upgraded pyrolysis oil showing that hydrocarbons were produced during HDO. The main products included up to 16.1% alcohols, 3.8% cyclic compounds, 21.2% hydrocarbons and 35.7% phenolics. Alcohols production can be used as gasoline additive to increase its octane number. Hydrocarbons production mainly contained C15-C16 hydrocarbons that fall in diesel carbon range. Our results successfully demonstrate a potential method for upgrading pyrolysis oil into transportation fuel under mild conditions. en_US
dc.description.sponsorship This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. en_US
dc.format Monograph en_US
dc.format.medium Electronic Resource en_US
dc.language.iso en_US en_US
dc.publisher The Graduate School, Stony Brook University: Stony Brook, NY. en_US
dc.subject.lcsh Materials Science en_US
dc.subject.other Biofuels, Bio-oil, Catalyst, HDO, Hydrodeoxygenation, Pyrolysis oil upgrading en_US
dc.title Catalytic Upgrading of Pyrolysis Oil to Transportation Fuels en_US
dc.type Dissertation en_US
dc.mimetype Application/PDF en_US
dc.contributor.committeemember Kim, Taejin en_US
dc.contributor.committeemember Turn, Scott. en_US

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