(513ai) Promoter and Support Effects on Transition Metal Carbides for CO2 Hydrogenation
AIChE Annual Meeting
2020
2020 Virtual AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Poster Session: Catalysis and Reaction Engineering (CRE) Division
Friday, November 20, 2020 - 8:00am to 9:00am
To investigate these interactions, Mo2C is synthesized on a variety of metal oxide supports using incipient wetness impregnation. Catalyst supports are selected to vary both chemical (Lewis and Brønsted acidity in H-ZSM-5 (Si/Al: 50 and 200) and structural (amorphous SiO2 vs. silicalite-1) properties to determine their effect on RWGS performance. Ion exchange effects are also investigated within supports using M-ZSM-5 (M: Na, K or Rb). NH3, CO2 and CO pulse chemisorption and temperature programmed desorption experiments are used to determine acidic properties and adsorption behavior of the reactant and product. These measurements are combined with X-ray characterization techniques (XRD, XAFS and XPS) to characterize the bulk and surface properties of the catalysts to correlate adsorption behavior to support properties and catalytic performance. Packed bed reactor experiments illustrate that varying the chemical properties of the support has little influence on reactor performance, but the support phase dramatically affects the catalytic performance, with SiO2 resulting in a CO STY of 0.7 L CO produced min-1 g-1, whereas silicalite-1 results in significantly decreased performance (0.01 L CO produced min-1 g-1).
References
- Porosoff, M. D.; Yang, X.; Boscoboinik, J. A.; Chen, J. G., Angew Chemie Int. Ed. 2014, 126 (26), 6823-6827.
- Morse, J. R.; Juneau, M.; Baldwin, J. W.; Porosoff, M. D.; Willauer, H. D., J CO2 Util 2020, 35, 38-46.