An environmentally benign method for the syn-thesis of heteropoly acids H3+nPMo12–nVnO40·xH2O(PMoVn,n=1–3)was developed by the reaction of an aqueous slurry which contained stoichiometric amounts of MoO3,V2O5 a...An environmentally benign method for the syn-thesis of heteropoly acids H3+nPMo12–nVnO40·xH2O(PMoVn,n=1–3)was developed by the reaction of an aqueous slurry which contained stoichiometric amounts of MoO3,V2O5 and H3PO4.Characterization of the as-synthesized catalysts with inductively coupled plasma(ICP)elemental analysis,thermogravimetry(TG),X-ray diffraction(XRD)and infra-red(IR)spectroscopy indicated that V ions substituted for Mo ions in Keggin-type phosphomolybdic acid.The as-synthesized samples were found to be an efficient catalyst for the hydroxylation of benzene which was carried out in a mixed solvent of acetonitrile and acetic acid with aqueous hydrogen peroxide as oxidant.PMoV2 exhibited the highest benzene conversion of 34.5%with phenol selectivity of 100%.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.20306011,Grant No.20476046)the Ph.D.Program Foundation of Chinese University(Grant No.20040291002).
文摘An environmentally benign method for the syn-thesis of heteropoly acids H3+nPMo12–nVnO40·xH2O(PMoVn,n=1–3)was developed by the reaction of an aqueous slurry which contained stoichiometric amounts of MoO3,V2O5 and H3PO4.Characterization of the as-synthesized catalysts with inductively coupled plasma(ICP)elemental analysis,thermogravimetry(TG),X-ray diffraction(XRD)and infra-red(IR)spectroscopy indicated that V ions substituted for Mo ions in Keggin-type phosphomolybdic acid.The as-synthesized samples were found to be an efficient catalyst for the hydroxylation of benzene which was carried out in a mixed solvent of acetonitrile and acetic acid with aqueous hydrogen peroxide as oxidant.PMoV2 exhibited the highest benzene conversion of 34.5%with phenol selectivity of 100%.
