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Chemical and Biological Engineering Publications

Acetic acid

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Full-Text Articles in Biomedical Engineering and Bioengineering

Cemox-Promoted Ketonization Of Biomass-Derived Carboxylic Acids In The Condensed Phase, Ryan William Snell, Brent H. Shanks Jan 2014

Cemox-Promoted Ketonization Of Biomass-Derived Carboxylic Acids In The Condensed Phase, Ryan William Snell, Brent H. Shanks

Chemical and Biological Engineering Publications

Ketonization of the model bio-oil compound acetic acid was performed in a toluene-solvent condensed phase using five different CeMOx catalysts. The catalysts were characterized using a number of different techniques both before and after reaction testing to gain understanding of how material traits influence their catalytic performance. A number of potentially important catalytic properties were found to be of little importance for the respective reaction. For instance, it was discovered that there was no direct correlation between prereaction surface area with activity for ketonization at high or at low temperatures. Furthermore, better reducibility of the oxide did not appear to ...


Insights Into The Ceria-Catalyzed Ketonization Reaction For Biofuels Applications, Ryan William Snell, Brent H. Shanks Jan 2013

Insights Into The Ceria-Catalyzed Ketonization Reaction For Biofuels Applications, Ryan William Snell, Brent H. Shanks

Chemical and Biological Engineering Publications

The ketonization of small organic acids is a valuable reaction for biorenewable applications. Ceria has long been used as a catalyst for this reaction; however, under both liquid and vapor phase conditions, it was found that given the right temperature regime of about 150-300 °C, cerium oxide, which was previously believed to be a stable catalyst for ketonization, can undergo bulk transformations. This result, along with other literature reports, suggest that the long held belief of two separate reaction pathways for either bulk or surface ketonization reactions are not required to explain the interaction of cerium oxide with organic acids ...


Hybrid Thermochemical Processing: Fermentation Of Pyrolysis-Derived Bio-Oil, Laura R. Jarboe, Zhiyou Wen, Dong Won Choi, Robert C. Brown Jan 2011

Hybrid Thermochemical Processing: Fermentation Of Pyrolysis-Derived Bio-Oil, Laura R. Jarboe, Zhiyou Wen, Dong Won Choi, Robert C. Brown

Chemical and Biological Engineering Publications

Thermochemical processing of biomass by fast pyrolysis provides a nonenzymatic route for depolymerization of biomass into sugars that can be used for the biological production of fuels and chemicals. Fermentative utilization of this bio-oil faces two formidable challenges. First is the fact that most bio-oil-associated sugars are present in the anhydrous form. Metabolic engineering has enabled utilization of the main anhydrosugar, levoglucosan, in workhorse biocatalysts. The second challenge is the fact that bio-oil is rich in microbial inhibitors. Collection of bio-oil in distinct fractions, detoxification of bio-oil prior to fermentation, and increased robustness of the biocatalyst have all proven effective ...