TY - JOUR
T1 - Exploring the Framework Hydrophobicity and Flexibility of ZIF-8: From Biofuel Recovery to Hydrocarbon Separations
AU - Zhang, Ke
AU - Lively, Ryan P.
AU - Zhang, Chen
AU - Chance, Ronald R.
AU - Koros, William J.
AU - Sholl, David S.
AU - Nair, Sankar
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-I1-011-21
Acknowledgements: This material is based upon work supported partially by the following agencies: Department of Energy under Award Number DE-FOA-0000096, and Algenol Biofuels. W.J.K. also acknowledges Award No. KUS-I1-011-21 made by King Abdullah University of Science and Technology (KAUST).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2013/10/14
Y1 - 2013/10/14
N2 - The framework hydrophobicity and flexibility of ZIF-8 are investigated by a detailed adsorption and diffusion study of a series of probe molecules including ethanol, 1-butanol, water, hexane isomers, xylene isomers, and 1,2,4-trimethylbenzene. The prospects for using ZIF-8 in biofuel recovery and hydrocarbon separations are discussed in terms of adsorption or kinetic selectivities. ZIF-8 shows extremely low water vapor uptakes and is especially suitable for vapor phase butanol-based biofuel recovery. The extraordinary framework flexibility of ZIF-8 is demonstrated by the adsorption of hydrocarbon molecules that are much larger than its nominal pore size, such as m-xylene, o-xylene and 1,2,4-trimethylbenzene. The calculation of corrected diffusion coefficients reveals an interesting spectrum of promising kinetic hydrocarbon separations by ZIF-8. These findings confirm that a molecular sieving effect tends to occur in the sorbate molecular size range of 4-6 Å rather than around the nominal ZIF-8 pore size of 3.4 Å, due to its surprising framework flexibility. © 2013 American Chemical Society.
AB - The framework hydrophobicity and flexibility of ZIF-8 are investigated by a detailed adsorption and diffusion study of a series of probe molecules including ethanol, 1-butanol, water, hexane isomers, xylene isomers, and 1,2,4-trimethylbenzene. The prospects for using ZIF-8 in biofuel recovery and hydrocarbon separations are discussed in terms of adsorption or kinetic selectivities. ZIF-8 shows extremely low water vapor uptakes and is especially suitable for vapor phase butanol-based biofuel recovery. The extraordinary framework flexibility of ZIF-8 is demonstrated by the adsorption of hydrocarbon molecules that are much larger than its nominal pore size, such as m-xylene, o-xylene and 1,2,4-trimethylbenzene. The calculation of corrected diffusion coefficients reveals an interesting spectrum of promising kinetic hydrocarbon separations by ZIF-8. These findings confirm that a molecular sieving effect tends to occur in the sorbate molecular size range of 4-6 Å rather than around the nominal ZIF-8 pore size of 3.4 Å, due to its surprising framework flexibility. © 2013 American Chemical Society.
UR - http://hdl.handle.net/10754/598293
UR - https://pubs.acs.org/doi/10.1021/jz402019d
UR - http://www.scopus.com/inward/record.url?scp=84887734046&partnerID=8YFLogxK
U2 - 10.1021/jz402019d
DO - 10.1021/jz402019d
M3 - Article
SN - 1948-7185
VL - 4
SP - 3618
EP - 3622
JO - The Journal of Physical Chemistry Letters
JF - The Journal of Physical Chemistry Letters
IS - 21
ER -