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Synfacts 2009(7): 0803-0803  
DOI: 10.1055/s-0029-1217234
Polymer-Supported Synthesis
© Georg Thieme Verlag Stuttgart ˙ New York

Photooxidation of Alkanes Using W10O32 4- on Organomodified SBA-15

Contributor(s):Yasuhiro Uozumi, Yoichi M. A. Yamada, Maki Minakawa
L. Ni*, J. Ni, Y. Lv, P. Yang*, Y. Cao*
East China Normal University and Fudan University, Shanghai, P. R. of China
Photooxygenation of Hydrocarbons over Efficient and Reusable Decatungstate Heterogenized on Hydrophobically-Modified Mesoporous Silica
Chem. Commun.  2009,  2171-2173  
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Publication History

Publication Date:
22 June 2009 (online)

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Key words

photooxidation - decatungstate - SBA-15 - mesoporous silica - heterogeneous catalysis

Significance

Photooxidation of alkanes using decatungstate W10O32 4- on a novel hydrophobically-organomodified SBA-15 as catalyst was described. The catalyst W10/C8-AP-SBA (W10=[W10O32 4-], C8 = octyl group, AP = 3-aminopropyl group) was prepared by treatment of C8H13Si(OEt)3 with SBA-15, grafting with 3-aminopropyl amine, acidification with CF3SO3H and ion exchange by decatungstate. W10/C8-AP-SBA showed photocatalytic oxidation activity for various alkanes under mild conditions to afford the corresponding ketones (7 examples, 28-97% conversion).

Comment

Elemental analysis using ICP showed that W10/Cn-AP-SBA gave ca. 12wt% loading of decatungstate. After the first oxidation of ethylbenzene, the catalyst was separated from the reaction mixture by filtration. The recovered catalyst was reused five times without any loss of catalytic activity. TEM and IR analysis showed no change in the nanostructure of the SBA-15 support and ­decatungstate species of the fifth reused catalyst, respectively. It was confirmed by ICP analysis that the W content in the used W10/C8-AP-SBA catalyst was the same as that in the fresh catalyst and that no W was detected in the filtrate.

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