FINAL PROJECT: Abstract and Reader's Reponse > Chemical Looping Combustion and the Effects of Material Structure on Reaction Efficiency
B, for either interview prep or even a way to close the piece, consider a brief statement that is related to the CLP efficiency comment: applications? For carbon capture technologies? What would the time frame be from proof of concept to mature and deployed technology?
Looking forward to reading this. :)
Looking forward to reading this. :)
December 11, 2016 |
Marybeth Shea
Marybeth Shea
Carbon emissions have risen significantly within the last century, and poses a significant problem to current environmental conditions. One of the current technologies that shifts industrial paradigms of fuel consumption, and reduces carbon emissions, is chemical looping combustion reactions (CLC). This form of technology utilizes oxygen storage materials (OSM) to provide lattice oxygen for natural gas combustion and methane reforming. Byproducts of these reactions include syngas, a gas for industrial uses, and carbon dioxide, which can be sequestered instead of released into the atmosphere. La1-xSrxFeO3-δ has shown potential for use as an OSM in CLC due to its high product selectivity, fast oxide diffusion, and cycling stability. In this work, we investigate the stoichiometric series of La1-xSrxFeO3-δ for x = 0, 1/3, ½, 2/3, and 1, using in situ synchrotron X-ray and neutron diffraction in order to study the structural evolution of this material under air and methane atmospheres. A temperature range in which oxygen can be easily and reversibly inserted and removed in the OSM was determined for x = 1/3, ½, 2/3, and 1, while the in situ studies reveal higher Sr content resulted in slower reaction kinetics, inhibited oxygen storage capacity, and inconsistent structures. We propose in situ diffraction studies as an evaluation for future OSMs, and La2/3Sr1/3FeO3-δ as the optimal OSM in this series due to its structure remaining consistent throughout the reaction and an optimal functional temperature range for CLC.
Reader's Response: How does your experiment advance research in CLC? Is this stoichiometric series of the OSM a novel concept, especially when studied with in situ diffraction studies? What are the implications of your findings? You should include information describing the efficiency of CLC as well.