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Issue 6, 2011
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Nature of vanadium species on vanadium silicalite-1 zeolite and their stability in hydroxylation reaction of benzene to phenol

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Abstract

The vanadium silicalite-1 (VS-1) zeolite catalysts with different vanadium contents were prepared by a modified hydrothermal synthesis method, and the one with the highest vanadium content (1.9 wt%) was treated by ammonium acetate (NH4OAc), H2O2 and/or acetic acid (HOAc). The samples were characterized by ICP, XRD, XPS, TPR, and DR UV-Vis to reveal the effect of the state of the vanadium species on the catalysts and to examine their leaching behavior under different conditions. The presence of H2O2 removed the vanadium oligomer loaded on the extra-framework of the VS-1. Highly dispersed distorted octahedral VV species located in the pore of zeolite were unstable in HOAc. The mononuclear octahedral VV, tetrahedral VV and VIV species in the framework showed good stability under the hydroxylation conditions. The VS-1 catalyst with 1.0 wt% of vanadium incorporation in the framework showed a stable hydroxylation activity yielding about 11% phenol (TOF = 63.0) with above 90% selectivity.

Graphical abstract: Nature of vanadium species on vanadium silicalite-1 zeolite and their stability in hydroxylation reaction of benzene to phenol

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Publication details

The article was received on 24 Mar 2011, accepted on 25 May 2011 and first published on 30 Jun 2011


Article type: Paper
DOI: 10.1039/C1CY00105A
Citation: Catal. Sci. Technol., 2011,1, 1060-1067
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    Nature of vanadium species on vanadium silicalite-1 zeolite and their stability in hydroxylation reaction of benzene to phenol

    B. Guo, L. Zhu, X. Hu, Q. Zhang, D. Tong, G. Li and C. Hu, Catal. Sci. Technol., 2011, 1, 1060
    DOI: 10.1039/C1CY00105A

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