Abstract
It is very important to separate air and the undesirable impurities from helium gas which is used for low temperature refrigerators or liquefires. But very few data are available for such requirements. We have made adsorption measurements of charcoal and natural zeolite at high pressures up to 110kg/cm3 G and at liquid nitrogen temperatures. The results show that there are two steps of adsorption mechanisms and these data are found to be very useful for actual helium purifier design.
