(708b) Effect of Isophtalate Moieties On The Adsorption Properties of Light Hydrocarbons in Tbo-MOF. Application to Methane Purification and Storage | AIChE

(708b) Effect of Isophtalate Moieties On The Adsorption Properties of Light Hydrocarbons in Tbo-MOF. Application to Methane Purification and Storage

Authors 

Belmabkhout, Y. - Presenter, King Abdullah University of Science and Technology


Effect of Isophtalate Moieties on The Adsorption Properties of Light Hydrocarbons in tbo-MOF. Application to Methane Purification and Storage

Youssef Belmabkhout1, Jarrod Eubank2, Vincent Guillerm1, Hasnaa Mouttaki2, and Mohamed Eddaoudi1,2.

 

1KAUST Advanced Membranes & Porous Materials Center, Functional Material Design, Discovery and Development (FMD3)King Abdullah University of Science and Technology
4700 King Abdullah University of Science and Technology Thuwal 23955-6900 (Kingdom of Saudi Arabia)

2Department of Chemistry, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA.

*Corresponding author email: youssef.belmabkhout@kaust.edu.sa

Equilibrium adsorption of methane (CH4), C2+ gases (i.e., ethane (C2H6), ethylene (C2H4), propane (C3H8) and propylene (C3H6)) and carbon dioxide (CO2) were measured on tbo-MOF-1[1] and its isoreticular, functionalized analogue, tbo-MOF-{CH2O[Ph(CO2H)2]}2 (or tbo-MOF-2) [2] characterized by pendant isophthalate moiety freely pointing into the cavities [J. Am. Chem. Soc., 2011, 133 (36), 14204–14207]. Both tbo-MOFs were evaluated in the spectra of methane storage and C2+/CH4 separation. The parent tbo-MOF-1 showed high gravimetric and volumetric CH4, close to the United State Department of Energy (DOE) target for methane storage at 35 bar and room temperature, while the presence of pendant isophthalate moiety in the analogue compound tbo-MOF-2 led to a decrease in CH4 uptake. Nevertheless, the additional isophthalate moiety increased the affinity for propane, propene, ethane, and ethylene at low pressures vs CH4, due mainly to the enhanced interactions with the isophthalate moiety and the reduced size of the cavities. Using Ideal Adsorption Solution Theory (IAST), the predicted mixture adsorption equilibria for C3H8/CH4, C3H6/CH4, C2H6/CH4, C2H4/CH4 and C3H8/CO2 systems showed high adsorption selectivity for C2+ over methane for tbo-MOF-2 as compared to the parent tbo-MOF-1. The relatively high affinity of tbo-MOF-2 to C2+ over CO2 make it suitable for it use in subsequent or/and simultaneous removal of C2+ from natural gas and refinery off-gases.

References

[1] Eubank, J. F.; Mouttaki, H.; Cairns, A.J.; Belmabkhout, Y.; Wojtas, L.; Luebke, R.; Alkordi, M.; Eddaoudi, M. The quest for modular nanocages: Tbo -MOF as an archetype for mutual substitution, functionalization, and expansion of quadrangular pillar building blocks. J. Am. Chem. Soc. 2011, 133, 14204-14207.