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  Application of Calcined Mg-Al Hydrotalcites for Michael Additions: An Investigation of Catalytic Activity and Acid-base Properties

Prescott, H. A., Li, Z.-J., Kemnitz, E., Trunschke, A., Deutsch, J., Lieske, H., et al. (2005). Application of Calcined Mg-Al Hydrotalcites for Michael Additions: An Investigation of Catalytic Activity and Acid-base Properties. Journal of Catalysis, 234(1), 119-130. doi:doi:10.1016/j.jcat.2005.06.004.

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 Creators:
Prescott, Hillary A., Author
Li, Zhi-Jian, Author
Kemnitz, Erhard, Author
Trunschke, Annette1, Author           
Deutsch, Jens, Author
Lieske, Heiner, Author
Auroux, Aline, Author
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: Hydrotalcite; Mg–Al mixed oxide; Acid–base properties; Solid base catalyst; Michael addition cooperation
 Abstract: Mg–Al hydrotalcite catalysts with different Mg/Al molar ratios (0.6, 1.4, 2.2, 3.0) were calcined and tested in liquid-phase Michael additions at room temperature. The catalysts and pure oxides (MgO and Al2subO3) were characterized by XRD, XPS, N2 adsorption experiments, 27Al MAS NMR, and TG-DTA. The acid–base properties of the samples were investigated by (a) FTIR spectroscopy after pyridine and CO2 adsorption and (b) microcalorimetry with CO2 and benzoic acid. Both acid sites (Lewis) and base sites (Lewis and Brønsted) are present on the surface of calcined hydrotalcites. The calcined hydrotalcites (CHT) catalyzed the Michael additions of CH-acid compounds to methyl vinyl ketone to give high product yields with 100% selectivity; the Al-rich sample exhibited the highest activity.

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Language(s): eng - English
 Dates: 2005
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
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Title: Journal of Catalysis
Source Genre: Journal
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Pages: - Volume / Issue: 234 (1) Sequence Number: - Start / End Page: 119 - 130 Identifier: -