Preparation and Characterization of Sol-Gel Derived 4%La_2O_3- Al_2O_3 Ceramic Membrane on Clay-Based Supports

摘要

In this work, γ-Al_2O_3 membrane layer (4 wt % La_2O_3 + 96 % Al_2O_3) 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_2O), PVA, distilled water and HNO_3. The thickness of the γ-Al_2O_3 membrane layer was between 5-7 μm. Two unprocessed clay samples which were supplied from Kutahya and Balikesir regions, were used to produce supports for the membranes. Porosities of the supports were varied from 25 to 40% depending on sintering temperatures. Mean pore diameter of the supports were between 0.01-1 μm. The mean pore diameter of 4wt%La_2O_3 -Al_2O_3 membrane layer was around 11 nm and total pore area was 113 m~2 / g at 1000 ℃ for 1 hour.