biostudies-literatureUnknown11(19)Aher DSUniversity Grants CommissionThe Keggin-based molybdo-substituted tungstophosphoric acid, H₃[PW₇Mo₅O₄₀]·12H₂O, were synthesized and incorporated with a bentonite clay by using a wetness impregnation method. The catalysts were characterized using several methods, such as inductively coupled plasma-atomic emission spectroscopy (ICP-AES), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), scanning electron microscopy energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), and thermogravimetric and differential thermal analysis (TG-DTA). This extremely active catalytic system provides a green strategy for the synthesis of 1,8-dioxo-octahydroxanthene and 1,8-dioxo-decahydroacridine derivatives under solvent free conditions at 80 °C with a good reaction mass efficiency, effective mass yield, and excellent atom economy. Both the surface acidity and catalytic activity sharply increased after H₃[PW₇Mo₅O₄₀]·12H₂O was impregnated with bentonite clay. In addition, the PW₇Mo₅/bentonite catalyst can be conveniently recovered and reused numerous times without demonstrating a significant loss in activity.RSC advances11244-11254https://www.ebi.ac.uk/biostudies/studies/S-EPMC8695863biostudies-literatureIncorporation of Keggin-based H₃PW₇Mo₅O₄₀ into bentonite: synthesis, characterization and catalytic applications.PMC8695863Aher DSKhillare KRShankarwar SGfalseIncorporation of Keggin-based H₃PW₇Mo₅O₄₀ into bentonite: synthesis, characterization and catalytic applications.The Keggin-based molybdo-substituted tungstophosphoric acid, H₃[PW₇Mo₅O₄₀]·12H₂O, were synthesized and incorporated with a bentonite clay by using a wetness impregnation method. The catalysts were characterized using several methods, such as inductively coupled plasma-atomic emission spectroscopy (ICP-AES), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), scanning electron microscopy energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), and thermogravimetric and differential thermal analysis (TG-DTA). This extremely active catalytic system provides a green strategy for the synthesis of 1,8-dioxo-octahydroxanthene and 1,8-dioxo-decahydroacridine derivatives under solvent free conditions at 80 °C with a good reaction mass efficiency, effective mass yield, and excellent atom economy. Both the surface acidity and catalytic activity sharply increased after H₃[PW₇Mo₅O₄₀]·12H₂O was impregnated with bentonite clay. In addition, the PW₇Mo₅/bentonite catalyst can be conveniently recovered and reused numerous times without demonstrating a significant loss in activity.2021-01-01T00:00:00Z2021 Mar2025-04-22T09:59:49.041Z2025-04-05T23:21:48.205ZS-EPMC86958633542362110.1039/d1ra01179k