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A functionalized material, PW/SBA-15m, was prepared successfully in diluted H_2SO_4 aqueous solutions by immobilizing 12-tungstophosphates on chemically modified mesoporous silica SBA-15 and characterized by elemental analysis, FTIR, ~ ~31 P MAS NMR, XRD and TEM. The results indicate that the framework of SBA-15 and the Keggin structure of PW_~12 O~3- _~40 were retained, and that 23%-33%(mass fraction) of ~PW_~12 O~3- _~40 was immobilized; the PW_~12 O~3- _~40 anions were finely dispersed on the pore wall of SBA-15. Having been leached in ethanol at 60 ℃ for 7 h, the loss of PW_~12 O~3- _~40 anions was not found.
A functionalized material, PW / SBA-15m, was prepared successfully in diluted H 2 SO 4 aqueous solutions by immobilizing 12-tungstophosphates on chemically modified mesoporous silica SBA-15 and characterized by elemental analysis, FTIR, ~ -31 P MAS NMR, XRD and TEM. The results indicate that the framework of SBA-15 and the Keggin structure of PW_ ~ 12 O ~ 3- _ ~ 40 were retained, and that 23% -33% (mass fraction) of ~ PW_ ~ 12 O ~ 3- _ ~ 40 was immobilized; the PW_ ~ 12 O ~ 3- _ ~ 40 anions were finely dispersed on the pore wall of SBA-15. Having been leached in ethanol at 60 ° C for 7 h, the loss of PW_ ~ 12 O ~ 3- _ ~ 40 anions was not found.