Open Access. Powered by Scholars. Published by Universities.®

Biomedical Engineering and Bioengineering Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 8 of 8

Full-Text Articles in Biomedical Engineering and Bioengineering

Production Of 5-Hydroxymethylfurfural From Glucose Using A Combination Of Lewis And Brønsted Acid Catalysts In Water In A Biphasic Reactor With An Alkylphenol Solvent, Yomaira J. Pagan-Torres, Tianfu Wang, Jean Marcel R. Gallo, Brent H. Shanks, James A. Dumesic Mar 2015

Production Of 5-Hydroxymethylfurfural From Glucose Using A Combination Of Lewis And Brønsted Acid Catalysts In Water In A Biphasic Reactor With An Alkylphenol Solvent, Yomaira J. Pagan-Torres, Tianfu Wang, Jean Marcel R. Gallo, Brent H. Shanks, James A. Dumesic

Brent H. Shanks

We report the catalytic conversion of glucose in high yields (62%) to 5-hydroxymethylfurfural (HMF), a versatile platform chemical. The reaction system consists of a Lewis acid metal chloride (e.g., AlCl 3) and a Bronsted acid (HCl) in a biphasic reactor consisting of water and an alkylphenol compound (2-sec-butylphenol) as the organic phase. The conversion of glucose in the presence of Lewis and Bronsted acidity proceeds through a tandem pathway involving isomerization of glucose to fructose, followed by dehydration of fructose to HMF. The organic phase extracts 97% of the HMF produced, while both acid catalysts remain in the aqueous ...


Sodium Ion Interactions With Aqueous Glucose: Insights From Quantum Mechanics, Molecular Dynamics, And Experiment, Heather B. Mayes, Jianhui Tian, Michael W. Nolte, Brent H. Shanks, Gregg T. Beckham, S. Gnanakaran, Linda J. Broadbelt Jan 2014

Sodium Ion Interactions With Aqueous Glucose: Insights From Quantum Mechanics, Molecular Dynamics, And Experiment, Heather B. Mayes, Jianhui Tian, Michael W. Nolte, Brent H. Shanks, Gregg T. Beckham, S. Gnanakaran, Linda J. Broadbelt

Chemical and Biological Engineering Publications

In the last several decades, significant efforts have been conducted to understand the fundamental reactivity of glucose derived from plant biomass in various chemical environments for conversion to renewable fuels and chemicals. For reactions of glucose in water, it is known that inorganic salts naturally present in biomass alter the product distribution in various deconstruction processes. However, the molecular-level interactions of alkali metal ions and glucose are unknown. These interactions are of physiological interest as well, for example, as they relate to cation-glucose cotransport. Here, we employ quantum mechanics (QM) to understand the interaction of a prevalent alkali metal, sodium ...


Effect Of Plant Hormones On The Production Of Biomass And Lipid In Microalgae, Malihe Mehdizadeh Allaf Aug 2013

Effect Of Plant Hormones On The Production Of Biomass And Lipid In Microalgae, Malihe Mehdizadeh Allaf

Electronic Thesis and Dissertation Repository

Limited fossil fuel reserves, increasing demand for energy in all parts of the world are some driving forces to look for new sources of transportation fuels. Among different options available, microalgae are currently attracting wide interests as an alternative and renewable fuel source.

Microalgae are single cell photosynthetic organisms that are known for rapid growth and high energy content and as a part of photosynthesis; they produce oil that can be used as a feedstock for biodiesel production. Some algae strains could contain lipid up to 80% of the dry biomass. The amount of lipid production is in direct relation ...


Production Of 5-Hydroxymethylfurfural From Glucose Using A Combination Of Lewis And Brønsted Acid Catalysts In Water In A Biphasic Reactor With An Alkylphenol Solvent, Yomaira J. Pagan-Torres, Tianfu Wang, Jean Marcel R. Gallo, Brent H. Shanks, James A. Dumesic Jan 2012

Production Of 5-Hydroxymethylfurfural From Glucose Using A Combination Of Lewis And Brønsted Acid Catalysts In Water In A Biphasic Reactor With An Alkylphenol Solvent, Yomaira J. Pagan-Torres, Tianfu Wang, Jean Marcel R. Gallo, Brent H. Shanks, James A. Dumesic

Chemical and Biological Engineering Publications

We report the catalytic conversion of glucose in high yields (62%) to 5-hydroxymethylfurfural (HMF), a versatile platform chemical. The reaction system consists of a Lewis acid metal chloride (e.g., AlCl 3) and a Bronsted acid (HCl) in a biphasic reactor consisting of water and an alkylphenol compound (2-sec-butylphenol) as the organic phase. The conversion of glucose in the presence of Lewis and Bronsted acidity proceeds through a tandem pathway involving isomerization of glucose to fructose, followed by dehydration of fructose to HMF. The organic phase extracts 97% of the HMF produced, while both acid catalysts remain in the aqueous ...


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 ...


Sulfated Zirconia Modified Sba-15 Catalysts For Cellobiose Hydrolysis, Volkan Degirmenci, Deniz Uner, Basak Cinlar, Brent H. Shanks, Aysen Yilmaz, Rutget A. Van Santen, Emiel J. M. Hensen Jan 2010

Sulfated Zirconia Modified Sba-15 Catalysts For Cellobiose Hydrolysis, Volkan Degirmenci, Deniz Uner, Basak Cinlar, Brent H. Shanks, Aysen Yilmaz, Rutget A. Van Santen, Emiel J. M. Hensen

Chemical and Biological Engineering Publications

Zirconia modified SBA-15 becomes a very active catalyst for the selective hydrolysis of cellobiose to glucose after sulfation. Spectroscopic investigations indicate the presence of Brønsted acid sites with similar properties to those present in conventional sulfated zirconia. Indications are found that the sulfate groups attached to zirconia interact with silanol groups of SBA-15. The catalytic activity in cellobiose hydrolysis correlates well with results for temperature-programmed decomposition of i-propylamine for a range of sulfated ZrO2/SBA-15 catalysts. A glucose yield of 60% during cellobiose hydrolysis at a reaction time of 90 min at 160° C is obtained.


Simulation Of Corn Stover And Distillers Grains Gasification With Aspen Plus, Ajay Kumar, Hossein Noureddini, Yasar Demirel, David Jones, Milford Hanna Jan 2009

Simulation Of Corn Stover And Distillers Grains Gasification With Aspen Plus, Ajay Kumar, Hossein Noureddini, Yasar Demirel, David Jones, Milford Hanna

Yasar Demirel Publications

A model was developed to simulate the performance of a lab‐scale gasifier and predict the flowrate and composition of product from given biomass composition and gasifier operating conditions using Aspen Plus software. Mass balance, energy balance, and minimization of Gibbs free energy during the gasification were applied to determine the product gas composition. Carbon conversion efficiency and tar content were provided to the model as inputs as these could not be predicted by the model based on minimization of Gibbs free energy. Experiments for validation of the model were performed on a lab‐scale fluidized bed gasifier using corn ...


A Combined Catalyst And Sorbent For Enhancing Hydrogen Production From Coal Or Biomass, Justinus A. Satrio, Brent H. Shanks, Thomas D. Wheelock Jan 2007

A Combined Catalyst And Sorbent For Enhancing Hydrogen Production From Coal Or Biomass, Justinus A. Satrio, Brent H. Shanks, Thomas D. Wheelock

Chemical and Biological Engineering Publications

Future large-scale production of H2 for use as a clean fuel will likely depend upon gasifying coal or biomass followed by steam reforming the resulting gas mixture and separating the CO2 byproduct. The process of steam reforming and CO2 separation can be greatly simplified by utilizing a new material that combines a reforming catalyst with a sorbent for CO2. Such a material was prepared in the form of small pellets with cores made of calcium and magnesium oxides and shells made largely of alumina impregnated with a nickel catalyst. Subsequent laboratory performance tests of the material showed that CO, CH4 ...