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Theses/Dissertations

Graduate Theses and Dissertations

Hydrogen

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Full-Text Articles in Biomedical Engineering and Bioengineering

Steam Reforming Of Water-Soluble Fast Pyrolysis Bio-Oil: Studies On Bio-Oil Composition Effect, Carbon Deposition, And Catalyst Modifications, Pedro J. Ortiz-Toral Jan 2011

Steam Reforming Of Water-Soluble Fast Pyrolysis Bio-Oil: Studies On Bio-Oil Composition Effect, Carbon Deposition, And Catalyst Modifications, Pedro J. Ortiz-Toral

Graduate Theses and Dissertations

Bio-oils from fast pyrolysis of lignocellulosic biomass can be phase separated into a heavy water insoluble portion and a light water-soluble portion. The water-rich portion contains mainly carboxylic acids, carbohydrates, aldehydes, ketones and alcohols. This highly oxygenated water-rich portion was evaluated for production of the renewable hydrogen required for the upgrading reactions. There are certain challenges introduced due to the complexity of these mixtures. Catalyst deactivation by coking and the formation of carbon deposits are major limitations although the specific causes were previously unidentified. A bio-oil fractionating system can separate heavier components from the light-end components. This light-end fraction has ...


Steam Reforming Of Bio-Oil: Effect Of Bio-Oil Composition And Stability, Pedro J, Ortiz-Toral Jan 2008

Steam Reforming Of Bio-Oil: Effect Of Bio-Oil Composition And Stability, Pedro J, Ortiz-Toral

Graduate Theses and Dissertations

Hydrogen can be obtained from biomass pyrolysis liquids by catalytic steam reforming. Catalyst deactivation by coking and the formation of carbon deposits are the major known limitations although the specific causes are unidentified. It is proposed that these limitations could be reduced by selectively reforming specific fractions of the bio-oil. The hydrophobic fraction mainly composed of heavy oligomers can be separated by water extraction as a high-value product. In the current work, the particular interest is on efficient hydrogen production from the residual aqueous fractions. There are certain challenges introduced due to the complexity of these mixtures. An improved understanding ...