TY - JOUR
T1 - Experimental studies on pore size change of porous ceramic membranes after modification
AU - Lin, Y. S.
AU - Burggraaf, A. J.
N1 - Funding Information:
One-layerp orousglass membranes One-layera -alumina membranes Two-layer zirconia membranes Supportedy -alumina membranes suppliedb y Alcoa Supported y-alumina membranes supplied by Alcoa Supporteds ilica membranes preparedb y sol-gel method Supported y-alumina membranes (Alcoa) One-layera lumina membranes asd La-modified supported y-alumina membranes Supported y-alumina membranes
PY - 1993/4/26
Y1 - 1993/4/26
N2 - Experimental results on pore size change of a microfiltration (MF) α-alumina membrane and an ultrafiltration (UF) γ-alumina membrane after modification by chemical vapor deposition (CVD) of solid oxides in the membrane pores are presented and explained using the results of a theoretical analysis. With an approx. 10-fold reduction in permeability, the average pore size of the MF membrane is found to increase after CVD modification, due to its relatively broader initial pore size distribution with a small amount of large pores and due to the particular CVD conditions (heterogeneous deposition mechanism) which give a pore narrowing rate independent of pore size. The effective pore size of the UF membrane appears to remain unchanged after modification with an approx. 50-fold reduction in permeability, as a result of the slit-shaped pores of the γ-alumina film and the particular modification conditions. The experimental and theoretical results suggest that, in order to reduce effectively the average pore size of a membrane by a modification process, the membrane should have a rather uniform pore size distribution, or the modification process should be conducted under conditions which give a pore narrowing rate proportional to the pore size.
AB - Experimental results on pore size change of a microfiltration (MF) α-alumina membrane and an ultrafiltration (UF) γ-alumina membrane after modification by chemical vapor deposition (CVD) of solid oxides in the membrane pores are presented and explained using the results of a theoretical analysis. With an approx. 10-fold reduction in permeability, the average pore size of the MF membrane is found to increase after CVD modification, due to its relatively broader initial pore size distribution with a small amount of large pores and due to the particular CVD conditions (heterogeneous deposition mechanism) which give a pore narrowing rate independent of pore size. The effective pore size of the UF membrane appears to remain unchanged after modification with an approx. 50-fold reduction in permeability, as a result of the slit-shaped pores of the γ-alumina film and the particular modification conditions. The experimental and theoretical results suggest that, in order to reduce effectively the average pore size of a membrane by a modification process, the membrane should have a rather uniform pore size distribution, or the modification process should be conducted under conditions which give a pore narrowing rate proportional to the pore size.
KW - ceramic membranes
KW - gas separations
KW - membrane modification, pore size change
KW - membrane preparation and structure
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U2 - 10.1016/0376-7388(93)85018-R
DO - 10.1016/0376-7388(93)85018-R
M3 - Article
AN - SCOPUS:0027579796
SN - 0376-7388
VL - 79
SP - 65
EP - 82
JO - Journal of Membrane Science
JF - Journal of Membrane Science
IS - 1
ER -