| 简介 |
PROBLEM TO BE SOLVED : To provide an alumina substrate for a zeolite membrane which can form a zeolite membrane having satisfactory crystallinity, and to provide a method for producing an alumina substrate for a zeolite membrane for obtaining the same.
SOLUTION : Disclosed is an alumina substrate for a zeolite membrane where, (1) in an alumina substrate comprising : (a) Al2O3 of 85 to 95 wt.%; (b) SiO2 of 3 to 13 wt.%; and (c) an alkali metal oxide and/or an alkaline-earth metal oxide of ≤4 wt.%, (2) porosity is ≥20%, (3) the average crystal grain size is 6 to 12 μm, and (4) the absolute value of zeta potential at pH 2 to 13 is ≤20 mV. Also disclosed is a method for producing the same.
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