(546y) CO2 Utilization in a Chemical Looping System for Methane Conversion to High Purity Syngas Using an Iron Based Composite Metal Oxide
AIChE Annual Meeting
2018
2018 AIChE Annual Meeting
Fuels and Petrochemicals Division
Poster Session: Fuels and Petrochemicals Division
Wednesday, October 31, 2018 - 3:30pm to 5:00pm
Thermodynamically, the solid phase of FeTiO3 is calculated to be in equilibrium with high purity syngas, thus making this solid phase the primary metal oxide for this study. Experiments on thermogravimetric analyzer (TGA) gave insights on the metal oxide conversion under reduction with methane co-fed with CO2. Differential fixed bed experiments were also performed to understand the gas phase composition which was measured using a micro-gas chromatography analyzer. Solid characterization techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were used to understand the changes in the solid phase. These experimental results will help guide the computational analysis in developing the mechanism. Oxygen vacancy interaction mechanism was carefully analyzed using atomistic thermodynamic methods and DFT calculations and compared against the experimental data. The mechanism thus developed will give a better understanding of CO2 utilization in this novel process, thus providing a pathway to improve the utility of this technology.