Abstract
We studied the properties of Ag + ions in zeolites AgZSM-5, AgY and AgX with CO as a probe molecule. We studied also how Ag + interacts with molecules of propene, acetylene, benzene and acetone. IR studies of CO sorption showed that Ag + in zeolites were less electron donor than Cu +. In the case of zeolite AgX two kinds of Ag + sites with various electron donor properties for example at various location (S II and S III) were found. The interaction of organic molecules with Ag + ions in zeolites results in the weakening of C C bond in propene, C C bond in acetylene, C C bond in aromatic ring in benzene as well as C O bond in acetone. This was realized by π back donation of d electrons of Ag + to antibonding π* orbitals of multiple bonds. However, the effect of multiple bonds weakening by Ag + ions is weaker than by Cu + ions due to weaker electron donor properties of Ag +. The coadsorption of CO and organic molecules on the same Ag + ion was also studied.
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