Introduction
Global problems such as pollution emission and
climate change from excessive utilization of fossil fuel
are considerably concerned. As the progress of fuel
cell technologies, hydrogen has potential to become
environmental friendly fuel. For example, when applying
hydrogen to fuel cell, it can produce electricity
at over 50% efficiency and the by-product is only
water. The challenge in this field is that demand for
high-purity hydrogen is growing, but the conventional
gas separation techniques need complex system and
are very expensive. Among the developed separation
processes, membrane technology is estimated to be
one of the most promising processes for production of
ultra-high pure hydrogen. Besides, it is a low energy
consumption process and compact system in comparison
with others.