Coating of Sol Particles for Membrane Applications |
| |
Authors: | J.-M. Hofman-Züter K. Keizer H. Verweij A.J. Burggraaf |
| |
Affiliation: | (1) Faculty of Chemical Technology, Laboratory of Inorganic Chemistry and Materials Science, University of Twente, P.O. Box 217, 7500AE Enschede, Netherlands |
| |
Abstract: | For improving chemical and thermal stability of γ-Al2O3 membranes boehmite (AlOOH) sol-particles are coated with Zr4+-species with two techniques. These techniques are heterogeneous precipitation (HP-method) and “surface-reaction-followed-by-polycondensation” (SRPC-method). A continuous coating layer is formed at relative low Zr4+-concentration, about one monolayer coverage of boehmite particles, and with the HP-method. For large concentrations and for the SRPC-method small particles (order 1 nm) of Zr4+-species are formed on the surface of the boehmite particles. After drying and calcination up to 1000°C no continuous layer of a zirconia phase could be detected for all samples. However the thermal stability of the porous structure is improved. Phase transitions of alumina occur at temperatures of 1100°C and the porous structure of the membrane material is then destabilized. |
| |
Keywords: | UF membranes alumina zirconia coating stability |
本文献已被 SpringerLink 等数据库收录! |