Monitoring cobalt ions siting in BEA and FER zeolites by in-situ UV–Vis spectroscopy: A DRS study

摘要: Abstract Two series of cobalt exchanged BEA and FER zeolites were obtained by using two distinct preparation methods to introduce the metal through ion-exchange, conventional method a microwave (MW)-assisted method. The different Co-based characterized means spectroscopic UV–Vis technique chemical analyses compared in terms efficiency introduction siting within pores structures. A first concluding result relates with implementation quantitative Co analysis, simple that can easily substitute time consuming expensive analyses. From analysis DRS spectra for materials contents from 0.01 3 wt.%, assuming Al framework distributions, it was possible identify cations or occurrence oxidic species. For both zeolites, microwave-assisted ion exchange led similar distributions over sites α, β γ, although latter case final amount is substantially lower. Moreover, radiation seems be an interesting tool prepare metal-based catalytic oxo-cations and/or oxide.