| 摘要 |
<p>PURPOSE:To obtain the subject zeolite capable of exhibiting excellent performance to selective adsorption of a hydrogen mixed gas by mixing sodium aluminate with water glass and nickel nitrate in a specific molar ratio, heating the mixture in a pressure vessel and then immersing the reaction product in an aqueous solution of calcium chloride. CONSTITUTION:An aqueous solution of sodium aluminate is blended with an aqueous solution of sodium silicate in a molar ratio of SiO2 to Al2O3 of 1.8-2.2 and a transition metal is used in a molar ratio of 0.1-0.4 based on Al2O3 derived from sodium aluminate, expressed in terms of the oxide. The aqueous solution of sodium silicate is instantaneously added to the aqueous solution of sodium aluminate under vigorous stirring condition and further, an aqueous solution of an inorganic salt of the transition metal (e.g. nickel nitrate) and the mixture is stirred for 30-60min and then charged in a pressure vessel and retained at ambient temperature to 120 deg.C for 5-60hr. A transition metal-containing synthetic zeolite A obtained thus is immersed in an aqueous solution of a calcium salt having 0.1-1mol concentration (e.g. calcium chloride) at ambient temperature for 48-60hr to provide the subject zeolite A.</p> |
