： The four heteropoly isomers K3H2[α-,β i-SiW11Fe(H2O)O39]· xH2O(β i=β 1,β 2,β 3)were prepared and Characterized by elementary analysis, IR and UV Spectroscopy. Its electrochemical behavior in aqueous solu...： The four heteropoly isomers K3H2[α-,β i-SiW11Fe(H2O)O39]· xH2O(β i=β 1,β 2,β 3)were prepared and Characterized by elementary analysis, IR and UV Spectroscopy. Its electrochemical behavior in aqueous solution has been discussed. The order of Polarographic half-wave potential E1/2 of heteropoly anions is as follows:β 2 >β 1 >β 3 >α . Its reduction process involves an one-electron reduction of Fe? and a pair of two-electron reduction of W? . Epolidation of maleic acid with H2O2 Catalyzed by heteropoly positional isomers was studied.β 3 isomers are the most active.展开更多
The four heteropoly isomers K3H3[α ,β i SiW11Zn(H2O)O39]· XH2O(β i=β 1,β 2,β 3) were prepared and characterized by elementary analysis, IR and UV spectroscopy, polargraphy and cyclic voitammetry, 183W NMR a...The four heteropoly isomers K3H3[α ,β i SiW11Zn(H2O)O39]· XH2O(β i=β 1,β 2,β 3) were prepared and characterized by elementary analysis, IR and UV spectroscopy, polargraphy and cyclic voitammetry, 183W NMR and XPS experiments. And these compounds can catalyze epoxidation reaction of olefine.展开更多
The thermal properties of two heteropoly complexes a- [ (C7H15) 4N]3H2[SiW11 (NbO2) O39] H2O and a-[ (C7H15)4N]4 [PW11 (NbO2). O39] H2O were studied by means of TG DTA and DSC. The activation energies and reaction ord...The thermal properties of two heteropoly complexes a- [ (C7H15) 4N]3H2[SiW11 (NbO2) O39] H2O and a-[ (C7H15)4N]4 [PW11 (NbO2). O39] H2O were studied by means of TG DTA and DSC. The activation energies and reaction orders of the thermal decomposition reaction of these complexes have been calculated.展开更多
The four heteropoly isomers K6[α-,βi-SiW11ZrO40]·XH2O（βi=β1,β2,β3） were prepared and characterized by elemental analysis,IR and UV spectroscopy,polargraphy and cyclic voitarnmetry,and183WNMR.The order of ...The four heteropoly isomers K6[α-,βi-SiW11ZrO40]·XH2O（βi=β1,β2,β3） were prepared and characterized by elemental analysis,IR and UV spectroscopy,polargraphy and cyclic voitarnmetry,and183WNMR.The order of polarographic half-wave:β2>β1>β3>α,and these compounds can catalyze epoxidation reaction of olefine.The catalytic activity of β isomer is higher than α.展开更多
文摘： The four heteropoly isomers K3H2[α-,β i-SiW11Fe(H2O)O39]· xH2O(β i=β 1,β 2,β 3)were prepared and Characterized by elementary analysis, IR and UV Spectroscopy. Its electrochemical behavior in aqueous solution has been discussed. The order of Polarographic half-wave potential E1/2 of heteropoly anions is as follows:β 2 >β 1 >β 3 >α . Its reduction process involves an one-electron reduction of Fe? and a pair of two-electron reduction of W? . Epolidation of maleic acid with H2O2 Catalyzed by heteropoly positional isomers was studied.β 3 isomers are the most active.
文摘The four heteropoly isomers K3H3[α ,β i SiW11Zn(H2O)O39]· XH2O(β i=β 1,β 2,β 3) were prepared and characterized by elementary analysis, IR and UV spectroscopy, polargraphy and cyclic voitammetry, 183W NMR and XPS experiments. And these compounds can catalyze epoxidation reaction of olefine.
文摘The thermal properties of two heteropoly complexes a- [ (C7H15) 4N]3H2[SiW11 (NbO2) O39] H2O and a-[ (C7H15)4N]4 [PW11 (NbO2). O39] H2O were studied by means of TG DTA and DSC. The activation energies and reaction orders of the thermal decomposition reaction of these complexes have been calculated.
文摘The four heteropoly isomers K6[α-,βi-SiW11ZrO40]·XH2O（βi=β1,β2,β3） were prepared and characterized by elemental analysis,IR and UV spectroscopy,polargraphy and cyclic voitarnmetry,and183WNMR.The order of polarographic half-wave:β2>β1>β3>α,and these compounds can catalyze epoxidation reaction of olefine.The catalytic activity of β isomer is higher than α.
