Chemical stability and hydrogen permeation performance of Ni-BaZr sub(0.1Ce) sub(0).7Y sub(0.2O) sub(3)-[delta] in an H sub(2S-containing atmosphere)

Composite membranes based on Ni and Zr-doped BaCeO sub(3 are promising for hydrogen separation. Such composites show high proton conductivity and adequate chemical stability in H) sub(2)O and CO sub(2, but may be unstable in H) sub(2)S. In this work, the hydrogen permeation performance of Ni -BaZr sub(0.1Ce) sub(0).7Y sub(0.2O) sub(3)-[delta] was measured in an H sub(2S-containing atmosphere at 900 [deg]C. The hydrogen permeation flux began to degrade in 60 ppm H) sub(2)S and decreased by about 45% in 300 ppm H sub(2S. After hydrogen permeation tests, X-ray diffraction analysis revealed the formation of BaS, doped CeO) sub(2), Ni sub(3S) sub(2) and Ce sub(2O) sub(2)S. Analysis of the microstructure and phase composition, and results of thermodynamic calculations suggest that reaction between H sub(2S and doped BaCeO) sub(3) caused the performance loss of the Ni -BaZr sub(0.1Ce) sub(0).7Y sub(0.2O) sub(3)-[delta].