Abstract: A process for separating oxygen more than 90% pure from a raw material gas, for example air, containing oxygen and nitrogen as main components, includes at least two adsorption zones, each having an inlet and a discharging end, and containing therein a bed of an adsorbing agent having sieving action which is capable of selectively adsorbing nitrogen from said raw material gas.

Abstract: A process for removing ozone from an ozone-containing gas which comprises treating the gas with a molded product obtained by the following steps,(a) wet-blending powdery or particulate activated carbon and zeolite in the presence of an organic binder and/or an inorganic binder,(b) molding the resulting blend,(c) drying the molded product, and(d) calcining the molded product at a temperature atwhich the network structure of the zeolite is not broken is disclosed.

Abstract: An efficient and economical method for the purification of hydrogen gas is proposed by use of an alloy of a rare earth metal with nickel and/or cobalt plus, optionally, iron, copper or chromium, utilizing the great selectivity of the alloy for the adsorption of hydrogen gas with very little adsorptivity for impurity gases commonly found in an impure hydrogen gas. The purification process is carried out by the pressurized adsorption of hydrogen on the alloy powder, followed by the recovery of high-purity hydrogen gas released from the alloy under reduced pressure or by heating. The alloy in the form of powder is preferably activated prior to use by repeated adsorption-desorption cycles of hydrogen on and from the alloy powder.