Composite Ni-Ba(Zr_(0.1)Ce_(0.7)Y_(0.2))O_3 membrane for hydrogen separation

摘要

Composite membranes consisting of Ni metal and Ba(Zr_(0.1)Ce_(0.7)YO_2)O_3 (or M-BZCY7) have been developed for separation of hydrogen from gas mixtures to replace M-BCY20 (Ni-BaCe_(0.8)Y_(0.2)O_3), which has poor stability in CO_2 and H_2O-containing atmosphere. Hydrogen fluxes through these cermet membranes were measured as a function of temperature, membrane thickness, and partial pressure of hydrogen in various atmospheres. Results indicated that the M-BZCY7 membrane is chemically stable and display high hydrogen permeability. A maximum flux of 0.805 cm~3 min~(-1) cm~2 was obtained for a dense cermet membrane of 266-mu m-thick at 900 deg C using 100 percent H_2 as the feed gas and 100ppm H_2/N_2 as the sweep gas. The stable performance of M-BZCY7 cermet membrane during exposure to a wet gas containing 30 percent CO_2 for about 80 h indicated that it is promising for practical applications.