Studies On The Synthesis And Structure Of Pd Clusters Encaged In Y-Zeotite

Pd clusters engaged in y-xcolite (Pd degrees Y) have been prepared by means of exchanging zeolite IIY with (P4I(NII3)(4)](2+) under microwave radiation. The product formed was deaminized by heating, washed sufficiently with de-ionized water and reduced with hydroge. The crystal phase diffraction of Pd was not found in the XRD spectrogram of Pd degrees Y. According to polycrystal X-ray diffraction data. Radial Electron Distribution Function (REDF) of Pd degrees Y WAS CALCULATED TO ELUCIDATE the structure of Pd cluster. The results show that the Pd clusters are of the AI type closely packed arrangement, The dimension of them is about 12 A. They are encaged in the supereage of zeolite Y. Their occupancy on the supercage is as small as 0,06 so that the framework structure of zeolite Y is unchanged. Therefore, the high dispersing, Pd cluster aggregating in supercage exhibit strong catalytic effect. The CO-conversion of Pd degrees Y with Pd 0.72% and 0,13% (in mass fraction) is 67% and 100% (in volume fraction) respectively. Evaluation conditions:mixed gas containing 0.02% Co and air,space velocity 3000 h(-1),reaction temperature 0 degrees C.