Preparation and characterization of sol-gel derived 4%La2O 3- Al2O3 ceramic membrane on clay-based supports

Abstract

In this work, γ-Al 2 O 3 membrane layer (4 wt % La 2 O 3 + 96 % Al 2 O ) was coated on the clay based porous support by using the sol-gel coating. The coating solution was prepared by using boehmite (AlOOH), La-nitrate (La 2 (NO 3 ) 3 .6H 2 O), PVA, distilled water and HNO 3 . The thickness of the γ-Al 2 O membrane layer was between 5-7 µm. Two unprocessed clay samples which were supplied from Kutahya and Balıkesir regions, were used to produce supports for the membranes. Porosities of the supports were varied from 25 to 40% depending on sintering temperatures. Mean 3 pore diameter of the supports were between 0.01-1µm. The mean pore diameter of 4wt%La – Al 2 O 3 membrane layer was around 11 nm and total pore area was 113 m 2 3 / g at 1000 C for 1 hour.

0

2

O 3