POROUS ALUMINA AS A SUPPORT FOR CATALYSTS AND MEMBRANES - PREPARATIONAND STUDY

Porous alumina as single tubes and as a multihole structure with contr olled properties has been prepared. It is shown that the porous struct ure of these supports can be controlled without burning out additives but by a variation of the ratio between the main alumina component (al pha-Al2O3) and aluminium hydroxide (binder) in the extrusion masses an d thermal treatment conditions. Gas permeability measurements have bee n used for the characterization of the supports. The properties of the ceramics are shown to satisfy the requirements of membrane supports.