Sol–gel routes for microporous zirconia and titania membranes

Effect of sol size on nanofiltration performance of a sol–gel derived microporous zirconia membrane

“…The variation of concentration of dissolved zirconia is not significant with corroded in a wide pH range of 1-12, while the increase of dissolved Zr 4+ is significant in a solution at pH of 13. Results indicate that the 400°C-calcined zirconia powder is stable in a pH window of 1-12, which is a considerable improvement in comparison with γ-Al 2 O 3 [25] and polymers [22] (Fig.…”

“…More importantly, appropriate sol size for fabrication of TiO 2 and/or ZrO 2 nanofiltration membrane is still ambiguous. As can be seen in Table 1, a zirconia membrane derived from a zirconia sol with an average size of 2-3 nm shows a discontinuous separation layer with many defects [13]. A dense zirconia membrane fabricated by using the sol with a size of about 6 nm cannot permeate water even under a trans-membrane pressure as high as 1.0 MPa [14].…”

Sol–gel derived mesoporous and microporous alumina membranes

“…molar ratio is above the threshold value for polymeric sols and a decrease in EAA content from 0.3 to 0.1 (p8 to p3) is mostly responsible for the twofold increase in sol particle size. Kreiter et al [41] reported that acetylacetone stabilized titania and zirconia nanoparticle sols with particle sizes of 1 and 2 nm can be prepared successfully.…”

Effect of Nb content on hydrothermal stability of a novel ethylene-bridged silsesquioxane molecular sieving membrane for H2/CO2 separation

“…Inorganic membranes that can separate hydrogen from CO 2 -containing gas streams with subsequent CO 2 sequestration, offer great potential for integration in pre-combustion CO 2 capture technologies and, hence, being a rather hot topic in the present membrane research field. Several inorganic materials have been proposed to be used as gas separation membranes for such purpose, including zeolites [6][7][8][9], carbon [10][11][12][13], silica and metal oxides [35,36]. Among these, silica-based microporous membranes with the pore size tailored to the gas molecular range is one of the most promising materials since Uhlhorn et al [37] firstly found their molecular sieving performances in 1989.…”