Tailoring hydrogen separation performance through the ceramic lanthanum tungstate membranes by chlorine doping.

Abstract The influences of solid-state reaction and sol-gel synthesis methods on the permeability through the La 5.5 W 0.6 Mo 0.4 O 11.25-δ membranes were investigated firstly. Then the superior sol-gel route was selected to synthesize chlorine-doped La 5.5 W 0.6 Mo 0.4 O 11.25-δ- x /2 Cl x (LWMCl x , x = 0–0.20) series membranes. The effects of chlorine doping on hydrogen separation performance through LWMCl x hydrogen permeable membranes were determined in detail. The developed LWMCl 0.1 membrane exhibited higher hydrogen permeability and better stability compared to its parent one, achieving 0.15 mL min−1 cm−2 at 1000 °C in dry atmosphere (50% H 2 in He), confirming the benefits of chlorine doping strategy. Highlights • Chlorine-doped La 5.5 W 0.6 Mo 0.4 O 11.25-δ Cl x (LWMCl x , x = 0–0.20) membranes were successfully prepared. • Enhanced hydrogen flux was achieved through the LWMCl x membranes. • Stable hydrogen permeation flux was obtained at 900 °C during the long-term test. • The distinctly difference of solid-state reaction and sol-gel methods were detail discussed. [ABSTRACT FROM AUTHOR]