TY - JOUR
T1 - Fabrication of a CO2-selective membrane by stepwise liquid-phase deposition of an alkylether functionalized pillared-layered metal-organic framework [Cu2L2P]n on a macroporous support
AU - Bétard, Angélique
AU - Bux, Helge
AU - Henke, Sebastian
AU - Zacher, Denise
AU - Caro, Jürgen
AU - Fischer, Roland A.
N1 - Funding Information:
This work has been funded by the DFG priority program SPP1362 “Porous Metal-Organic Frameworks”. AB is grateful for a Ph.D. fellowship by the German Academic Exchange Service (DAAD) and thanks Ruhr University Research School ( www.research-school.rub.de ) for further support.
PY - 2012/3/1
Y1 - 2012/3/1
N2 - Metal-organic framework (MOF) membranes were prepared by stepwise deposition of reactants. Two pillared layered MOFs with the general formula [Cu2L2P]n (L = dicarboxylate linker, P = pillaring ligand) were selected. Within this family, fine tuning of adsorption affinity and pore size is possible by variation or functionalization of the L and P linkers. Compound 1 was chosen to be non-polar (L = 1,4- naphtalenedicarboxylate = ndc, P = 1,4-diazabicyclo(2.2.2)octane = dabco); in contrast, compound 2 included a polar linker L with two conformationally flexible ether side chains (L = 2,5-bis(2-methoxyethoxy)-1,4-benzene- dicarboxylate = BME-bdc, P = dabco). The polar functionalization is expected to increase the framework affinity for CO2 compared to CH4. The step-by-step, liquid phase deposition of 1 and 2 resulted in pore-plugging of macroporous ceramic supports. The performances of the two MOF membranes were evaluated in gas separation experiments of equimolar CO2/CH 4 mixtures using a modified Wicke-Kallenbach technique. Anti-Knudsen CO2/CH4 separation factors in the range of ∼4-4.5 were obtained for the membrane consisting of the polar 2, whereas the separation of the membrane formed from the non-polar 1 was found to be Knudsen-like.
AB - Metal-organic framework (MOF) membranes were prepared by stepwise deposition of reactants. Two pillared layered MOFs with the general formula [Cu2L2P]n (L = dicarboxylate linker, P = pillaring ligand) were selected. Within this family, fine tuning of adsorption affinity and pore size is possible by variation or functionalization of the L and P linkers. Compound 1 was chosen to be non-polar (L = 1,4- naphtalenedicarboxylate = ndc, P = 1,4-diazabicyclo(2.2.2)octane = dabco); in contrast, compound 2 included a polar linker L with two conformationally flexible ether side chains (L = 2,5-bis(2-methoxyethoxy)-1,4-benzene- dicarboxylate = BME-bdc, P = dabco). The polar functionalization is expected to increase the framework affinity for CO2 compared to CH4. The step-by-step, liquid phase deposition of 1 and 2 resulted in pore-plugging of macroporous ceramic supports. The performances of the two MOF membranes were evaluated in gas separation experiments of equimolar CO2/CH 4 mixtures using a modified Wicke-Kallenbach technique. Anti-Knudsen CO2/CH4 separation factors in the range of ∼4-4.5 were obtained for the membrane consisting of the polar 2, whereas the separation of the membrane formed from the non-polar 1 was found to be Knudsen-like.
KW - CO /CH separation
KW - Membrane
KW - Metal-organic frameworks
KW - Stepwise deposition
UR - http://www.scopus.com/inward/record.url?scp=80054987045&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2011.09.006
DO - 10.1016/j.micromeso.2011.09.006
M3 - Article
AN - SCOPUS:80054987045
SN - 1387-1811
VL - 150
SP - 76
EP - 82
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1
ER -