(396d) Enhanced Dry Reforming of Methane Using Pseudo Catalytic Metal Oxide and Nanoparticles
AIChE Annual Meeting
Tuesday, November 15, 2022 - 4:27pm to 4:46pm
To address the issue, a higher proportion of CO2 with respect to methane is investigated. At this ratio, carbon deposition is thermodynamically zero at pressures up to 30 atm, which means the process can be operated even at higher pressures, thus eliminating the enormous compression and decompression costs. A pseudo-catalytic metal-oxide (PMO) prepared using industrial solid state synthesis method is developed to process the higher CO2 to CH4 ratio. The pseudo-catalytic nature of the metal oxide is imparted by the PMOâs tendency to participate in the reaction, forming stable reaction intermediates. The PMO material employs a unique syngas generation mechanism at high temperatures to efficiently convert CH4 and CO2 to syngas. Based on the demand, this high-quality syngas can be further converted into liquid fuels such as C3+ olefins and aromatics. Continuous testing at 1000C at CO2/CH4 ratio of 1.5 exhibited no carbon deposition for more than 850 hours. Further, the process showed 80% CO2 conversion and near 100% CH4 conversion during the testing. The syngas yield per mole of CH4 is 3.7 versus the thermodynamic limit at 3.8. Besides, the quality of syngas obtained is H2:CO = 0.8. Steam can be added to the reactants to alter the syngas quality further.
Furthermore, smaller size nanoparticles were also studied to investigate the effect of particle size on the reaction performance. The material is based on FeNi3 nanoparticles supported by SBA-15 (FeNi3@SBA-15). The pore size and pore connectivity of SBA-15 have been tuned to achieve the optimal molecular diffusivity and reactivity. This tuning was achieved by controlling intermicellular interactions, through the choice of surfactant and the synthesis temperature. The FeNi3@SBA-15 samples were synthesized using wet impregnation method and their physicochemical characteristics were analyzed with Brunauer-Emmet-Teller (BET), transmission electron microscopy (TEM), X-ray diffraction (XRD), and small-angel X-ray scattering (SAXS) analyses. Their catalytic activity was studied by temperature-programmed reaction. The FeNi3@SBA-15 with a pore radius of 18.7 Ã and pore volume of 0.461 cc/g exhibited high reaction kinetics and over 99% methane conversion at 900 â. The potentiality of these nanoparticles can be investigated further for long term and high temperature testing similar to industrial grade PMO. Enhanced DRM can be an effective route to utilize the two greenhouse gases, converting them into value-added products.