Author： Yu R. Xiao F.-S. Wang D. Liu Y. Pang G. Feng S. Qiu S. Xu R. Ma S.
Publisher： Springer Publishing Company
ISSN： 1011-372X
Source： Catalysis Letters, Vol.49, Iss.1-2, 1997-11, pp. : 49-52
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Abstract
A novel type of complex oxide HxV2Zr2O9.H 2O with V4+ and V5+ mixed valence has been hydrothermally synthesized in a V2O5-ZrO2-H2O system at 240°C for 5 days in presence of NaF. The catalytic data over these complex oxides show that these complex oxides are catalytically very active in phenol hydroxylation by 30% aqueous hydrogen peroxide, and their catalytic activity is dependent on crystal size of the catalysts. The phenol conversion over the catalyst with crystal size of 7 μm is twice that over the catalyst with crystal size of 35 μm. The V5+ species are suggested to be the catalytic active sites. Some other factors which influence the catalytic activity were also investigated.
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