Comparative study on the preparation of molybdenum-containing hierarchical macro-mesoporous materials by extraction and calcination

• Published in: Journal of materials science 2022-10, Vol.57 (39), p.18513-18523
• Main Authors: Zhang, Jian, Liu, Liping, Zhang, Huien, Chen, Zhongfa
• Format: Article
• Language: English
• Subjects: Catalysts; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Comparative studies; Crystallography and Scattering Methods; Dichloroethane; Energy Materials; Epoxidation; Fourier transforms; Hydrochloric acid; Materials Science; Molybdenum; Polymer Sciences; Polymethyl methacrylate; Porous materials; Scanning electron microscopy; Selectivity; Solid Mechanics; Spectrum analysis; X ray photoelectron spectroscopy
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-022-07510-3

Molybdenum-containing hierarchical mesoporous Mo-HM-SBA-15-C with calcinated method and Mo-HM-SBA-15-E with extracted method were prepared. The obtained materials were characterized by XRD, SEM, EDS, BET, XPS and FT-IR. SEM, XRD and BET studies confirmed that the highly ordered mesoporous structure was maintained in Mo-HM-SBA-15-C and Mo-HM-SBA-15-E. XPS study showed that there were high concentrations of Mo 5+ and Mo 6+ species in Mo-HM-SBA-15-E, while the surface of Mo-HM-SBA-15-C contained only Mo 6+ species. The catalyst Mo-HM-SBA-15-E showed better catalytic performance than the Mo-HM-SBA-15-C catalyst for the epoxidation of methyl oleate at 80 °C with t-BuOOH as oxygen source for 6 h in 1, 2-dichloroethane. And the conversion of 99.23% and selectivity of > 99.00% were appeared. Mo-HM-SBA-15-E has a better catalytic performance, which may cause a higher concentration of Mo 5+ and Mo 6+ species on the surface of multistage porous materials due to extraction method. Graphical abstract