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

Biomedical Engineering and Bioengineering Commons

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

Articles 1 - 4 of 4

Full-Text Articles in Biomedical Engineering and Bioengineering

Ecological Co2 Flux Of A Green Roof Ecosystem And A Typical Grassland Ecosystem, Madeline Oxner May 2019

Ecological Co2 Flux Of A Green Roof Ecosystem And A Typical Grassland Ecosystem, Madeline Oxner

Biological and Agricultural Engineering Undergraduate Honors Theses

The Hillside Auditorium Green Roof is a low impact development feature on the University of Arkansas campus. It retains storm water and allows plants living on the roof to take up and transpire the water. Green roofs work to mimic natural ecosystems in urban environments. A key property is ecosystem respiration, which plays a large role in the global carbon cycle and is an important biologic activity indicator. The ecosystem respiration of Hillside Auditorium Green Roof was compared to a typical grassland ecosystem at the University of Arkansas farm to determine how closely the green roof is able to mimic ...


Development Of A Combined Catalyst And Sorbent For The Water Gas Shift Reaction, Meng Kong, Karl O. Albrecht, Brent H. Shanks, Thomas D. Wheelock Jan 2014

Development Of A Combined Catalyst And Sorbent For The Water Gas Shift Reaction, Meng Kong, Karl O. Albrecht, Brent H. Shanks, Thomas D. Wheelock

Chemical and Biological Engineering Publications

A combined catalyst and sorbent was developed for reacting CO with steam to produce H2 in a single reaction stage at 600 °C by employing the water gas shift (WGS) reaction. The combined material was in the form of spherical pellets where each pellet consisted of a CaO core for absorbing byproduct CO2 surrounded by a porous shell of Al2O 3 which supported a Ni catalyst. The best results were achieved by incorporating 5 wt % limestone in the shell material to suppress coking. By employing the best core-in-shell pellets and supplying a 3:1 mol ratio ...


Improving The Stability Of A Cao-Based Sorbent For Co 2 By Thermal Pretreatment, Dursun Can Ozcan, Brent H. Shanks, Thomas D. Wheelock Jan 2011

Improving The Stability Of A Cao-Based Sorbent For Co 2 By Thermal Pretreatment, Dursun Can Ozcan, Brent H. Shanks, Thomas D. Wheelock

Chemical and Biological Engineering Publications

Although the reversible absorption of CO 2 by CaO at high temperature has been proposed as a promising method for capturing and removing CO 2 from hot gas streams produced by the combustion of fossil fuels and other industrial processes, the activity of the sorbent has invariably declined when applied over many cycles of CO 2 absorption and desorption. The objective of the present investigation was to extend the life cycle performance of the absorbent through improved thermal pretreatment as the absorbent was prepared from limestone, dolomite, calcium acetate, or plaster of Paris. The first three materials were converted to ...


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 ...