Abstract
CO adsorbents were prepared by forming small CuCl crystallites(∼160 A) on the surface of an intermediate density silica gel. CO adsorption by the adsorbents is carried out by converting the CuCl crystallites into a bulk [Cu(CO)Cl] complex under moderate CO pressure (e.g., 2.7 atm at 30 °C). The bulk [Cu(CO)Cl] decomposes when the gas phase CO pressure is below the equilibrium CO pressure (e.g., 0.5 atm at 30 °C). This unique CO adsorption mechanism results in a CO isotherm consisting of separate adsorption and desorption branches, i.e., a large hysteresis feature. The threshold pressure of [Cu(CO)Cl] formation appears to be a function of the size of the CuCl crystallites.
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