利用多酸在SBA-15孔道中制备组分可调的氧化钼-五氧化二钒纳米线

A new approach was developed to fabricate nanowires of mixed oxides MoO3-V2O5 inside the channels of mesoporous silica SBA-15. The method involves functionalization of the channel surface of SBA-15 with aminosilane groups, immobilization of Keggin-type molybdovanadophosphoric acids through an acid-base interaction, and heat treatment. The immobilization of the heteropolyacid containing mixed addenda makes the molar ratio of the loaded components controllable. The formation of the MoO3-V2O5 nanowires inside the channels was monitored by variable temperature in situ XRD. The materials obtained by heat treatment at 400℃ for 5 h were characterized by TEM, N2-sorption measurements, laser Raman spectra and UV-Vis diffuse reflectance spectra. Further heat treatment of the MoO3-V2O5 nanowires inside the SBA-15 channels at higher temperature (700℃) destroys the framework integrity of SBA-15 by complete sublimation of MoO3 through the SBA-15 channel walls.

Preparation of MoO3‐V2O5 Nanowires with Controllable Mo/V Ratios inside SBA‐15 Channels Using a Chemical Approach with Heteropoly Acid

A new approach was developed to fabricate nanowires of mixed oxides MoO₃‐V₂O₅ inside the channels of mesoporous silica SBA‐15. The method involves functionalization of the channel surface of SBA‐15 with aminosilane groups, immobilization of Keggin‐type molybdovanadophosphoric acids through an acid‐base interaction, and heat treatment. The immobilization of the heteropolyacid containing mixed addenda makes the molar ratio of the loaded components controllable. The formation of the MoO₃‐V₂O₅ nanowires inside the channels was monitored by variable temperature in situ XRD. The materials obtained by heat treatment at 400 °C for 5 h were characterized by TEM, N₂‐sorption measurements, laser Raman spectra and UV‐Vis diffuse reflectance spectra. Further heat treatment of the MoO₃‐V₂O₅ nanowires inside the SBA‐15 channels at higher temperature (700 °C) destroys the framework integrity of SBA‐15 by complete sublimation of MoO₃ through the SBA‐15 channel walls.