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Preparation of MoO 3 ‐V 2 O 5 Nanowires with Controllable Mo/V Ratios inside SBA‐15 Channels Using a Chemical Approach with Heteropoly Acid
Author(s) -
Yue Bin,
Tan DeJun,
Yan ShiRun,
Zhou Yan,
Zhu KaKe,
Pan JianFeng,
Zhuang JiHua,
He HeYong
Publication year - 2005
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200590008
Subject(s) - chemistry , nanowire , sublimation (psychology) , sorption , heteropoly acid , molar ratio , mesoporous material , raman spectroscopy , surface modification , mesoporous silica , chemical engineering , nanotechnology , analytical chemistry (journal) , adsorption , organic chemistry , catalysis , materials science , psychology , physics , engineering , optics , psychotherapist
A new approach was developed to fabricate nanowires of mixed oxides MoO 3 ‐V 2 O 5 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 MoO 3 ‐V 2 O 5 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, N 2 ‐sorption measurements, laser Raman spectra and UV‐Vis diffuse reflectance spectra. Further heat treatment of the MoO 3 ‐V 2 O 5 nanowires inside the SBA‐15 channels at higher temperature (700 °C) destroys the framework integrity of SBA‐15 by complete sublimation of MoO 3 through the SBA‐15 channel walls.