Ultra-thin ( < 1 mu m) internally-coated Pd-Ag alloy hollow fiber membrane with superior thermal stability and durability for high temperature H-2 separation

作者：Maneerung Thawatchai; Hidajat Kus; Kawi Sibudjing^*

来源：Journal of Membrane Science, 2014, 452: 127-142.

DOI：10.1016/j.memsci.2013.10.040

• Pd-Ag alloy membrane
• H-2 separation
• Hollow fiber membrane
• Electrolcss plating
• Ultrathin Pd-based membrane

Ultrathin ( < 1 mu m) Pd-Ag alloy membranes have been successfully coated on the internal surface of YSZ-mixed Al2O3 hollow fibers by sequential electroless plating. The H-2 permeance and selectivity of internally-coated (0.8 mu m thick) Pd-Ag alloy membrane is more than 5 mu mol m(-2) s(-1) Pa-1 and well over 1200, respectively, at 450 degrees C and the pressure difference of 100 kPa. The internally-coated Pd-Ag alloy membranes exhibit the significantly improved thermal stability and durability of membranes. This is due to the support layer constrains the thermal expansion of Pd-Ag alloy during the annealing as well as the permeation tests, preventing the clelaminating of Pcl-Ag alloy membrane, and hence allowing the membranes to tolerate the repeated cyclic permeation tests over at least 5 cycles (10 h/cycle) without the significant loss of H-2 selectivity. Moreover, mechanical damages (e.g., scratching) of Pd-Ag membrane can also be prevented as the Pd-Ag membrane is not exposed directly to the external surface.

• 出版日期2014-2-15