TY - JOUR
T1 - Synthesis, characterization and gas transport properties of MOF-5 membranes
AU - Zhao, Zhenxia
AU - Ma, Xiaoli
AU - Li, Zhong
AU - Lin, Y. S.
N1 - Funding Information:
The work was supported by the Petroleum Research Fund , U.S. National Science Foundation and National Natural Science Foundation of China (Nos. 21006031 and 20936001 ). Zhenxia Zhao is grateful to China Scholarship Council for fellowship to support her visit to ASU.
PY - 2011/10/15
Y1 - 2011/10/15
N2 - Continuous and crake-free MOF-5 membranes of about 14μm in thickness were prepared by seeding size-reduced MOF-5 crystals followed by the secondary growth synthesis. The membrane quality was examined by a molecule probing method using a series of organic compounds with sizes ranging from 0.56nm to 1.4nm. Negligible pervaporation flux (1.39×10 -6mol/m 2/s) of 2-dicyclohexylphosphino-2'-(N, N-dimethylamino) biphenyl through the MOF-5 membrane shows absence of the defects larger than the MOF-5 crystalline pores in the MOF-5 membranes. The gas permeance for the MOF-5 membranes, under conditions of T=298-374K, p f=270kPa and p p=101kPa, decreases with increasing molecular weight of the molecules in the order of H 2>He>CO∼N 2>CO 2>SF 6, showing a diffusion-dominating permeation mechanism for the MOF-5 membranes. CO 2 permeation data for the MOF-5 membranes were analyzed by a permeation model with the input of the adsorption isotherm data to obtain more reliable CO 2 diffusivity data in MOF-5, which is in the order of 1×10 -9m 2/s with activation energy for diffusion of about 14.8kJ/mol.
AB - Continuous and crake-free MOF-5 membranes of about 14μm in thickness were prepared by seeding size-reduced MOF-5 crystals followed by the secondary growth synthesis. The membrane quality was examined by a molecule probing method using a series of organic compounds with sizes ranging from 0.56nm to 1.4nm. Negligible pervaporation flux (1.39×10 -6mol/m 2/s) of 2-dicyclohexylphosphino-2'-(N, N-dimethylamino) biphenyl through the MOF-5 membrane shows absence of the defects larger than the MOF-5 crystalline pores in the MOF-5 membranes. The gas permeance for the MOF-5 membranes, under conditions of T=298-374K, p f=270kPa and p p=101kPa, decreases with increasing molecular weight of the molecules in the order of H 2>He>CO∼N 2>CO 2>SF 6, showing a diffusion-dominating permeation mechanism for the MOF-5 membranes. CO 2 permeation data for the MOF-5 membranes were analyzed by a permeation model with the input of the adsorption isotherm data to obtain more reliable CO 2 diffusivity data in MOF-5, which is in the order of 1×10 -9m 2/s with activation energy for diffusion of about 14.8kJ/mol.
KW - Gas permeation, diffusion
KW - MOF-5 membrane
KW - Metal-organic frameworks
KW - Molecular probing tests
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U2 - 10.1016/j.memsci.2011.07.048
DO - 10.1016/j.memsci.2011.07.048
M3 - Article
AN - SCOPUS:84860389896
SN - 0376-7388
VL - 382
SP - 82
EP - 90
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
IS - 1-2
ER -