One-step synthesis, characterization and oxidative desulfurization of 12-tungstophosphoric heteropolyanions immobilized on amino functionalized SBA-15

摘要

Graphical abstractDisplay OmittedHighlights?The H2N-SBA-15 support has been functionalized with APTES using one-stage synthetic method.?The PW?-NH3+-SBA-15 catalyst synthesized by immobilization of Keggin ion onto surface of H2N-SBA-15.?The synthesized PW?-NH3+-SBA-15 catalyst has high catalytic activity for the ODS of DBT.AbstractKeggin-type 12-tungstophosphoric [PW12O40]3?heteropolyanions were successfully immobilized onto mesoporous material surface of SBA-15 functionalized using the (3-aminopropyl)triethoxysilane (APTES) synthesized by one-pot co-condensation method, also called one-step synthesis. The synthesized PW?-NH3+-SBA-15 catalyst was characterized by XRD, N2adsorption–desorption, FT-IR, TGA, SEM, TEM, EDS, XPS methods. The results indicated that ordered hexagonal mesostructure for SBA-15 support was still maintained after being functionalized with amine groups, while the specific surface area of SBA-15 was decreased. The active species of phosphotungstic acid H3PW12O40(HPW) retained its Keggin structure of the heteropolyanions on the amine-modified SBA-15. The PW?–+H3N–SBA–15 catalyst exhibited a high catalytic activity for oxidative desulfurization process of sulfur-containing model fuel. The dibenzothiophene (DBT) conversion of almost 100% was achieved with reaction conditions of 40?mg of catalyst dosage, 2?mL of hydrogen peroxide, 90?°C of reaction temperature, and 120?min of reaction time.]]>