Abstract
The silver-X zeolite was prepared and ..gamma..-irradiated by /sup 60/Co at room temperature. ESR measurements were made at -196/sup 0/C. A figure shows the ESR spectrum observed for silver-X ..gamma..-irradiated after evacuation at 350/sup 0/C. The anisotropic g factors, and the anisotropic hyperfine splittings obtained agree well with those of the divalent silver ion. The Ag/sup 2 +/ spectrum was broadened by exposing the sample to 150 Torr of oxygen, suggesting that the Ag/sup 2 +/ ions are located at the sites in the supercage. Upon the introduction of water vapor, the Ag/sup 2 +/ disappeared, suggesting that the polarization of water may result in the transfer of negative charge from anion center irradiation, and reduce the ion to Ag/sup +/. The effect of pretreatment temperature on the intensity of the Ag/sup 2 +/ spectrum increases up to 350/sup 0/, then it gradually decreases as the temperature increases, indicating that the zeolite structure can no longer stabilize the Ag/sup 2 +/ ion. The exposure of ..gamma..-irradiated Ag-X to pyridine changed the ESR spectrum showing 8 superhyperfine lines due to nitrogen nuclei, indicating 2 or 3 pyridine molecules adsorbed on one silver ion. The ESR spectrum of Ag/sup 2 +/ disappearedmore » upon heating the ..gamma..-irradiated sample to 150/sup 0/C, while the spectrum with nitrogen superhyperfine lines disappeared at 100/sup 0/C.« less
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