Abstract
The samples of CdZSM-5 prepared by ion-exchange, incipient wetness impregnation, and the interaction of HZSM-5 with cadmium vapor were studied by DRIFT spectroscopy using molecular hydrogen as a probe adsorbed at 77 K. Three different cadmium cationic species were detected. Dicadmium Cd 2 2 + ions most weakly perturb adsorbed hydrogen molecules. They are characterized by a band at 4102 cm −1. Two other kinds of isolated Cd 2+ sites are characterized by bands at 3982 and 3940 cm −1. The former band was ascribed to isolated Cd 2+ cations which compensated the negative charges of neighboring aluminum–oxygen tetrahedra. The latter band corresponds to isolated Cd 2+ cations which compensate the negative charges of distantly separated aluminum–oxygen tetrahedra. The calcination of samples containing Cd 2 2 + species in oxygen converts these species into cadmium oxocations [Cd 2O x ] 2+. Hydrogen molecules dissociate at room temperature on the isolated Cd 2+ cations which most strongly perturb adsorbed hydrogen molecules at 77 K.
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