III International Conference

PP-II-21It is shown, that the Pt – containing catalysts are the luminescenzing in the bonds withthe λ = 450 and 750 nm. The bonds intensive correlated with the activity values and thestructural type of the zeolites. The luminescence intensity decreased in the carrier’s row of theBEA, MOR and ZSM-5. These facts were explained in this work.The luminescence characteristics (λ = 370 and λ = 410 nm) of Co – containing catalystsdepend essentially on the concentration and methods of cobalt deposits, carriers types (γ – orθ – modification) and the thermal treatment. The change of the samples colour was observedduring the thermal treatment. This can be caused by cobalt valence transformation (Co 2+ →Co 3+ ). The luminescence in the bands of with λ = 370, 380 and 410 nm was connected to theradiation of the lattice exitons (Osi*, OAl*), while the band with the λ = 740 nm was causedby the admixture of the Fe 3+ ions.It is established, that the increase of the palladium contents (0,05-0,1 %) results inreduction of the luminescence intensity (Fig. 2). The forecasting model of Pd contents onintensity of the luminescence has been obtained.J, rel.un.380410300425032001501002150400 500 600 700 800λ, nmFig.2. Spectra of a luminescence of palladium: 1 – 1,0% Pd, 2 – 0,7%Pd, 3 – 0,3% Pd, 4 – 0,1% PdThus, this laser – luminescence method allows to get an important information about theinteraction of the metal with crystal lattice of the catalyst carrier along with about catalyticactivity. It is represented not only theoretical, but practical interest as well.References1. Yarovoj P.N., Skornikova S.А., Ovchinnikova O.V., Chistoforova N.V. Luminescence ofcatalysts at laser excitation, - АSTА, 2003 - 104 p.202