@article{barton_vantreeck_duran_schulte_flickinger_2020, title={A falling film bioreactor (FFBR) for generating effective gas-to-liquid mass transfer using wavy laminar flow for continuous microbial gas processing}, volume={219}, ISSN={["1873-4405"]}, DOI={10.1016/j.ces.2020.115592}, abstractNote={Efficient recycling of gaseous carbon to chemicals using immobilized microorganisms is possible with reduced water use and power input for gas-liquid (GL) mass transfer using a falling film bioreactor (FFBR). In a FFBR, a wavy laminar liquid film (Re < 200) descends over a cylindrical paper biocatalyst support to (1) provide efficient GL mass transfer without bubbles, (2) provide hydration and nutrients, and (3) remove secreted liquid products. Paper roughness had previously been shown to enhance GL mass transfer. FFBRs (~1 m and ~0.1 m) without cells were constructed as prototypes for continuous bioprocessing of gas and evaluated for mass transfer based on liquid film thickness and O2 kLa. Prototype flow distributors for the FFBR were generated by 3D printing. Average liquid film thicknesses of ~0.080–0.300 mm and O2 kLa values >103 h−1 were achieved. Liquid film thickness was measured by a novel image analysis method using 4K photography.}, journal={CHEMICAL ENGINEERING SCIENCE}, author={Barton, Ryan R. and VanTreeck, Kelly E. and Duran, Christopher J. and Schulte, Mark J. and Flickinger, Michael C.}, year={2020}, month={Jun} }
 @article{ekins-coward_boodhoo_velasquez-orta_caldwell_wallace_barton_flickinger_2019, title={A Microalgae Biocomposite-Integrated Spinning Disk Bioreactor (SDBR): Toward a Scalable Engineering Approach for Bioprocess Intensification in Light-Driven CO2 Absorption Applications}, volume={58}, ISSN={["0888-5885"]}, DOI={10.1021/acs.iecr.8b05487}, abstractNote={A scalable, solar-energy-driven microbial spinning disk gas absorber–converter technology has been developed by a novel combination of advanced photoreactive biocomposite materials with a continuous thin film flow spinning disc bioreactor (SDBR). Chlorella vulgaris microalgae were incorporated into a porous paper biocomposite for the first time with the addition of chitosan for cell integration within the paper matrix. A 10-cm-diameter SDBR with an immobilized C. vulgaris biocomposite paper enabled high photoactivity and CO2 biofixation at a spin speed of 300 rpm over 15 h of operation in the presence of bicarbonate in the liquid medium and 5% CO2 in the gas environment. Practically all C. vulgaris cells in the biocomposite successfully remained attached to the disk under conditions equivalent to 5g at the disc edge. Overall, the increased CO2 biofixation with a greatly reduced biocomposite surface area and the high cell retention in this proof-of-concept technology highlight the bioprocess intensificatio...}, number={15}, journal={INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH}, author={Ekins-Coward, Thea and Boodhoo, Kamelia V. K. and Velasquez-Orta, Sharon and Caldwell, Gary and Wallace, Adam and Barton, Ryan and Flickinger, Michael C.}, year={2019}, month={Apr}, pages={5936–5949} }
 @article{barton_carrier_segura_fierro_escalona_peretti_2017, title={Ni/HZSM-5 catalyst preparation by deposition-precipitation. Part 1. Effect of nickel loading and preparation conditions on catalyst properties}, volume={540}, ISSN={["1873-3875"]}, DOI={10.1016/j.apcata.2017.03.040}, abstractNote={Nickel metal supported on HZSM-5 (zeolite) is a promising catalyst for lignin depolymerization. In this work, Ni/HZSM-5 catalysts were synthesized via deposition-precipitation (DP) and characterized. The effect of synthesis parameters; including nickel loading, DP time (synthesis contact time), and calcination temperature, on catalyst properties were studied. N2 and CO2 adsorption techniques were used to look at textural properties and confirmed the existence of lamellar species generated from DP. X-ray diffraction (XRD) confirmed that nickel metal was present on the support after reduction and passivation of the catalyst. Temperature programmed reduction showed that all the catalyst preparations were reducible at 733 K after 4 h, and that the DP method formed a mixture of Ni2+ species on the support. Transmission electron microscopy, XRD, and H2 chemisorption were used to determine approximate particle size and dispersion of nickel metal. From all the preparations, the 15 wt% Ni/HZSM-5 catalyst with long DP time (16 h) and low calcination temperature (673 K), exhibited the most favorable particle size (∼5 nm) and dispersion (7%).}, journal={APPLIED CATALYSIS A-GENERAL}, author={Barton, R. R. and Carrier, M. and Segura, C. and Fierro, J. L. G. and Escalona, N. and Peretti, S. W.}, year={2017}, month={Jun}, pages={7–20} }