| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 56734 | Catalysis Today | 2010 | 6 Pages |
Abstract
Vanadium-apatite containing the 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 Brønsted basicity were generated on the surface of VAP. The strong basicity of the solid VAP-catalyzed efficient Michael reaction in water solvent. Furthermore, VAP was found to be applicable to the direct synthesis of pyrazolinone derivatives using aryl hydrazines and diethyl ethoxymethylenemalonate.
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Authors
Kiyotomi Kaneda, Takayoshi Hara, Norifumi Hashimoto, Takato Mitsudome, Tomoo Mizugaki, Koichiro Jitsukawa,