COMPOSITE POROUS SUBSTRATE FOR OXIDE-CERAMIC MEMBRANES AND METHOD OF MAKING IT Russian patent published in 2009 - IPC B01D71/02 

FIELD: chemistry.

SUBSTANCE: present invention pertains to membrane technology. Proposal is given of metakaolinite Al₂Si₂O₇ with high open porosity of over 55%, with bimodal distribution of pores on size and over 14% shrinkage potential, coated with refractory oxides, and meant for making multilayered ceramic membranes with selective permeability to oxygen. The invention can be used in catalytic membrane reactors, solid fuel oxide cells and oxygen separators. The substrate is obtained from suspension on a base of selected white-burning kaolins and clays with microcrystalline cellulose additives. The method involves burning the prepared and formed suspension, subsequent leaching in diluted acids and saturation with precursors of refractory oxides, particularly Lu₂O₃.

EFFECT: obtaining an asymmetric substrate, with little mismatch in shrinkage during sintering and with better chemical compatibility with ceramics.

12 cl, 4 dwg, 3 tbl, 13 ex