Ti-functionalised MWW silica zeolites in the role of catalysts for diphenyl sulphide oxidation with H2O2

[EN] In the presented studies, the titanium-grafted MWW silica zeolites were tested as catalysts in the oxidation of diphenyl sulphide (Ph2S) using hydrogen peroxide (H2O2) as the oxidant. To overcome the problem of diffusion limitations for bulky reactant molecules into the catalyst's channel system and improve accessibility to active sites, titanium was grafted onto the silica MWW zeolite support in its three-dimensional form (ITQ-1) and its delaminated form (ITQ-2). The obtained materials were characterised with respect to their chemical composition (ICP-OES), structure (FTIR, XRD), textural properties (low-temperature N2 sorption), and titanium form (UV-vis DRS). Post-synthetic modification with a metal precursor resulted in titanium deposition mainly on the outer surface of the materials in the form of monomeric Ti(IV) species. Owing to the active phase form and material properties, all the studied samples performed high catalytic activity in the Ph2S oxidation by H2O2.