Hexagonal Mesostructured Vanadium Oxide （HMVO）：Synthesis、Characterization and Catalytic Oxidation

• Main Authors: F.Y Chu, 朱芳瑩
• Other Authors: A.N Ko
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/31621727411257260416

碩士 === 東海大學 === 化學系 === 95 === The hexagonal mesostructured vanadium oxide（HMVO）was synthesized via hydrothermal method.Its catalytic properties were compared with those of traditional V2O5 and V2O5/Al2O3 catalysts. The samples were characterized by XRD, FT-IR, TRR of H2, TGA, N2-adsorption, 51V solid NMR and SEM techniques. The powder XRD patterns of uncalcined catalysts show lamellar structures, but hexagonal structures after calcinations. The FT-IR spectra reveals V=O bonding in the HMVO samples. The TGA technique shows the lose of catalyst weight with rising temperature, indicating its structural change. According to the 51V solid NMR results, both uncalcined and calcined HMVO exhibit distorted tetrahedral bonding, whereas V2O5 shows octahedral bonding. The reduction properties of both HMVO and V2O5 are obtained from TRR of H2. The catalysts were utilized in the oxidation reaction of diphenylmethane（DPM） and tert-butyl hydroperoxide to produce benzophenone at 1 atm in a batch reactor. Good catalytic results are observed under the following reaction conditions : 60℃, stirring speed 200 rpm, catalyst weight 0.075g and acetic acid as the solvent. In addition, HMVO owns the best catalytic activity as compared to V2O5 and V2O5 / Al2O3 due to its characteristic composition, pore size and structure.