OICC Press Iranian Journal of Catalysis 2345-4865 3 3 2024 02 03 Nanosized mesoporous composite PW12-APTES@KIT-6: An efficient heterogeneous catalyst for selective oxidation of sulfides to sulfoxides and sulfones EN Razieh Fazaeli Department of Chemistry, Shahreza Branch, Islamic Azad University, 86145-311, Iran. Hamid Aliyan Department of Chemistry, Shahreza Branch, Islamic Azad University, 86145-311, Iran. Somaieh Parishani Foroushani Department of Chemistry, Shahreza Branch, Islamic Azad University, 86145-311, Iran. Zahra Mohagheghian Department of Chemistry, Shahreza Branch, Islamic Azad University, 86145-311, Iran. Zahra Heidari Department of Chemistry, Shahreza Branch, Islamic Azad University, 86145-311, Iran. Journal Article 2024 02 03 Surface of mesostructured silica, KIT-6, was modified by grafting 3-aminopropyl-triethoxysilane (APTES) to have the positive charge, and thus, to provide sites for the immobilization of H3PW12O40 (PW12).  This modified-nanosized mesoporous silica (PW12-APTES@ KIT-6) was characterized by FTIR, XRD, BET and TEM. The oxidation of sulfides occurs effectively and selectively with H2O2 as the oxidant. PW12-APTES@KIT-6 was used as the catalyst.  The catalyst can be reused for several times but it will be less active.