Preparation of a porous magnetic filter for O2 gas concentration

Abstract

We produced porous ceramics for gas separation using membrane formation of Nd2Fe14B powders on alumina (Al2O3) support. The average pore size and porosity of the alumina support were, respectively about 67mm and 34-40%. Selectivity of this support was about 1.07, which well agreed with Knudsen diffusion. The coated Nd2Fe 14B membrane thickness was about 166 μm. The sample selectivity after membrane formation was 1.07. Gas selectivity properties were not developed. When magnetized on the same sample, gas selectivity appeared at low differential pressure at gas permeation. Samples with a lower gas flow rate of the alumina support exhibited higher selectivity. The maximum was 1.22. © 2013 The Ceramic Society of Japan. All rights reserved.