Polymer-Protected Metal Complex for Gas Separation. II. Cross-Linked Polystyrene-Supported Aluminium Copper(I) Halide as Solid Carbon Monoxide Adsorbent

Macroreticular (MR) type cross-linked polystyrene-supported aluminium copper(I) chloride is prepared by refluxing MR type polystyrene (divinylbenzene content 20%), aluminium chloride, and copper(I) chloride in benzene, toluene, carbon disulfide, or dichloromethane, followed by evaporation of the liquid phase. All the polystyrene-supported aluminium copper(I) chloride exhibit rapid and reversible adsorptions of carbon monoxide (CO). For the adsorbent prepared by using toluene as solvent, the equilibrium molar ratio of adsorbed CO to the charged copper(I) chloride is 0.83 at 20 °C under 1 atm (initial partial pressure of CO: 0.90 atm). Desorption of CO is carried out at 7 mmHg, 20 °C for 10 min. The equilibrium molar ratio of adsorbed CO to the charged copper(I) chloride in the second adsorption is 0.56. In the following adsorptions, the equilibrium molar ratios are virtually constant at 0.56. Usage of either gel type cross-linked polystyrenes or a linear polystyrene in place of the MR type cross-linked polystyrene results in CO adsorbents having poor abilities with respect to both adsorption rates and capacities. The adsorbing capacities of the CO adsorbents prepared from aluminium halide, copper(I) halide, and the MR type cross-linked polystyrene decrease as follows: AlCl3–CuCl system>AlBr3–CuBr system>>AlI3–CuI system≈AlCl3–CuI system≈AlI3–CuCl system≈0.