III International Conference

PP-II-21LUMINESCENT DIAGNOSTICS OF CATALYSTS PROPERTIES AND THEIRSYNTHESIS PARAMETERSChistoforova N.V., Yelkina I.M., Skornikova S.A.Angarsk State Technical Academy, Angarsk, RussiaE-mail: ryabinak@mail.ruFor the first time, we present the results of the investigation of carriers samples. Weinvestigated three structural types of zeolites: beta (BEA), ZSM-5, mordenit (MOR) andcatalysts with Pt, Pd, Co, Cr based on those carriers. The correlation between intensity ofluminescence and catalytic activity is established in the field of 350-800 nm. Spectra ofluminescence depend on the type of a crystal lattice, a way of synthesis of the catalyst,concentration impurity ions of metals (Fe 3+ , Cr 3+ , etc.), thermal processing (incideration,roasting).The research works were carried out on the lazer-luminescent installation in AngarskState Technical Academy. The diagnostic method of catalysts and their properties based onluminescent characteristics has been developed as a result. This method allows to perform thediagnostics of catalysts and their carriers during a synthesis and operation.It is established, that the synthesized samples of zeolites have a luminescence atexcitation by laser radiation (337 nm). Spectra for zeolite (ВЕА) of the different time ofcrystallization are presented infig. 1. For all samples the band witha maximum 400 nm is typical. Theband intensity increases withincrease of crystallization time. Thestructure of the luminescencecentres is probably connected tofeatures of a crystal lattice. Inparticular, the luminescence may becaused by radiation autolocatedexcitons. We studied theluminescence of various types ofzeolites before and showed that it isconnected to the luminescence of thelattice [1].Fig. 1. Spectra of a luminescence of zeolite fordifferent times of crystallization201