Hydrothermal Stability of Hydrogen-Selective Carbon–Ceramic Membranes Derived from Polybenzoxazine-Modified Silica–Zirconia

This work investigated the long-term hydrothermal performance of composite carbon-SiO(2)-ZrO(2) membranes. A carbon-SiO(2)-ZrO(2) composite was formed from the inert pyrolysis of SiO(2)-ZrO(2)-polybenzoxazine resin. The carbon-SiO(2)-ZrO(2) composites prepared at 550 and 750 °C had different surface and microstructural properties. A carbon-SiO(2)-ZrO(2) membrane fabricated at 750 °C exhibited H(2) selectivity over CO(2), N(2), and CH(4) of 27, 139, and 1026, respectively, that were higher than those of a membrane fabricated at 550 °C (5, 12, and 11, respectively). In addition to maintaining high H(2) permeance and selectivity, the carbon-SiO(2)-ZrO(2) membrane fabricated at 750 °C also showed better stability under hydrothermal conditions at steam partial pressures of 90 (30 mol%) and 150 kPa (50 mol%) compared with the membrane fabricated at 500 °C. This was attributed to the complete pyrolytic and ceramic transformation of the microstructure after pyrolysis at 750 °C. This work thus demonstrates the promise of carbon-SiO(2)-ZrO(2) membranes for H(2) separation under severe hydrothermal conditions.