Patent ID: 6048509
Filing Date: 2000-04-11
Classification: B01D,Y02C

Abstract:
A process for purifying a gas comprising nitrogen and oxygen, which is contaminated with impurities comprising water, carbon monoxide and carbon dioxide, comprising the following steps conducted in the following order:contacting the gas with a catalyst consisting of platinum or palladium and at least one member selected from the group consisting of iron, cobalt, nickel, manganese, copper, chromium, tin, lead and cerium wherein the catalyst is supported on alumina containing substantially no pores having pore diameters of 110 Angstroms or less under conditions which oxidize the carbon monoxide into carbon dioxide;contacting the gas with an adsorbent selected from the group consisting of silica gel, activated alumina, zeolite and combinations thereof under conditions in which water is adsorbed and removed from the gas, andcontacting the gas with an adsorbent selected from the group consisting of calcium ion exchanged A zeolite; calcium ion exchanged X zeolite; sodium ion exchanged X zeolite and mixtures thereof under conditions which carbon dioxide is adsorbed and removed from the gas.