Vanadosilicate V-SBA-1, which incorporated more than 4 wt % vanadium (Si/V < 20) in cubic mesoporous molecular sieves, was directly synthesized under strongly acidic conditions and characterized by various techniques. Powder X-ray diffraction (XRD) showed that the resultant samples had a well-ordered cubic SBA-1 structure. The structural regularity of V-SBA-1 was improved by preparation under highly acidic conditions. N 2 adsorption/desorption measurements confirmed that an additional large mesopore (≈40 Å) was simultaneously produced with the main one (≈20 Å) in SBA-1 after the incorporation of vanadium into the SBA-1 framework. UV−vis and laser Raman results revealed that the incorporated vanadium species existed in a highly dispersed state and had tetrahedral coordination.
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Dai et al. (2000) studied this question.