Creation of a monomeric vanadate species in an apatite framework as an active heterogeneous base catalyst for Michael reactions in water
作者:Kiyotomi Kaneda、Takayoshi Hara、Norifumi Hashimoto、Takato Mitsudome、Tomoo Mizugaki、Koichiro Jitsukawa
DOI:10.1016/j.cattod.2009.08.018
日期:2010.7
VO43− species was synthesized. Several characterization techniques such as XRD, TEM, XPS, ESR, UV–vis DRS, V K-edge XAFS, 51V MAS NMR, Raman spectroscopy, and CO2 TPD revealed that the vanadium-apatite was Ca9(VO4)5(HVO4)(OH), abbreviated to VAP, covered with calcium oxide. This surface-coated calcium oxide phase could be removed by washing with water and then, the monomeric V-OH species having the strong
合成了含有VO 4 3-的钒磷灰石。XRD,TEM,XPS,ESR,UV-vis DRS,V K-edge XAFS,51 V MAS NMR,拉曼光谱和CO 2 TPD等几种表征技术表明,钒磷灰石为Ca 9(VO 4)5(HVO 4)(OH),缩写为VAP,用氧化钙覆盖。可以通过用水洗涤来除去该表面被覆的氧化钙相,然后在VAP的表面上生成具有强的布朗斯台德碱度的单体V-OH物质。固体VAP催化的高效Michael反应在水溶剂中具有很强的碱性。此外,发现VAP适用于使用芳基肼和乙氧基亚甲基丙二酸二乙酯直接合成吡唑啉酮衍生物。