Development of Ruthenium-Hydroxyapatite-Encapsulated Superparamagnetic -Fe2O3 Nanocrystallites as an Efficient
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- 作者：Kohsuke Mori ; Satoko Kanai ; Takayoshi Hara ; Tomoo Mizugaki ; Kohki Ebitani ; Koichiro Jitsukawa ; Kiyotomi Kaneda
- 刊名：Chemistry of Materials
- 出版年：2007
- 出版时间：March 20, 2007
- 年：2007
- 卷：19
- 期：6
- 页码：1249 - 1256
- 全文大小：338K
- 年卷期：v.19,no.6(March 20, 2007)
- ISSN：1520-5002
文摘
Magnetic 
-Fe2O3 nanocrystallites dispersed in a hydroxyapatite matrix (HAP--Fe2O3) have beensynthesized for the first time as a new catalyst support. The cation-exchange ability of the external HAPsurface enables an equimolar substitution of Ru for Ca to form a catalytically active center (RuHAP--Fe2O3). Characterization by several spectroscopic methods demonstrated the formation of -Fe2O3nanocrystallites within the HAP matrix having a mean diameter of 8.0 nm (
= 18.4 Å, /d = 21.7%).The Ru species was proven to exist in the monomeric form in a highly dispersed manner. The RuHAP--Fe2O3 exhibits superior catalytic activity for the oxidation of various alcohols to the correspondingcarbonyl compounds using molecular oxygen as a primary oxidant. The magnetic properties of the RuHAP--Fe2O3 provided a convenient route for separation of the catalyst from the reaction mixture by applicationof an external permanent magnet. No metal leaching was detected, and the spent catalyst could be recycledwithout appreciable loss of catalytic activity.
-Fe2O3 nanocrystallites dispersed in a hydroxyapatite matrix (HAP--Fe2O3) have beensynthesized for the first time as a new catalyst support. The cation-exchange ability of the external HAPsurface enables an equimolar substitution of Ru for Ca to form a catalytically active center (RuHAP--Fe2O3). Characterization by several spectroscopic methods demonstrated the formation of -Fe2O3nanocrystallites within the HAP matrix having a mean diameter of 8.0 nm ( = 18.4 Å, /d = 21.7%).The Ru species was proven to exist in the monomeric form in a highly dispersed manner. The RuHAP--Fe2O3 exhibits superior catalytic activity for the oxidation of various alcohols to the correspondingcarbonyl compounds using molecular oxygen as a primary oxidant. The magnetic properties of the RuHAP--Fe2O3 provided a convenient route for separation of the catalyst from the reaction mixture by applicationof an external permanent magnet. No metal leaching was detected, and the spent catalyst could be recycledwithout appreciable loss of catalytic activity.