Dispersion of CuCl2 into NaY zeolite studied by positrons

A series of samples, prepared from mechanical mixtures of CuCl2 with NaY zeolite and resulting in the dispersion of CuCl,, was studied by positron annihilation spectroscopy. We measured the positron lifetime spectroscopy as a function of the weight ratio of the CuCl2-NaY zeolite heated at 140 degreesC for 1 h as well as at 450 degreesC for 4 h, respectively. We also measured it as a function of the heated temperature.of 1 h, and as a function of the time heated at 300 degreesC for CuCl2-NaY(mass ratio 0.01). All lifetime spectras were resolved into five(or four) components, in which the third, the fourth and the fifth components were related to the annihilation in beta cage, supercage and interface void, respectively. The experimental results showed that positron annihilation spectroscopy was sensitive to probe the change of the dispersion of a few Of CuCl2 in NaY zeolite, and there was much CuCl2 remained on the outside surface of NaY after heated at high temperature for a long time even for a few of CuCl2.