Studies on Catalytic Electro-oxidation of Hydrazine on Modified Graphite Electrode by Coordination Compounds of d-Transition Metals with TP(ο-NO2)TBP

Chem. J. Chinese Universities ›› 1993, Vol. 14 ›› Issue (12): 1710.

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Studies on Catalytic Electro-oxidation of Hydrazine on Modified Graphite Electrode by Coordination Compounds of d-Transition Metals with TP(ο-NO₂)TBP

ZHU Zhen-Ping, REN Jian-Guo, QIN Zi-Bin

Department of Chemistry, Wuhan University, Wuhan, 430072

Received:1993-01-13 Revised:1993-07-28 Online:1993-12-24 Published:1993-12-24

Abstract

Abstract: The catalytic properties of coordination compounds of Co(Ⅱ), Fe(Ⅲ), Ni(Ⅱ), andZn(Ⅱ) with meso-tetrakis (ο-nitrophenyl) tetrabenzoporphyrin [MTP(ο-NO₂)TBPor MTBP] on modified graphite electrode for the electro-oxidation of hydrazine have been examined.The results indicate that the oxidation peak potentials shift to more cathodic direction₃₆₀ mVfor Co (Ⅱ)TBPand 250 mVfor ClFe(Ⅲ)TBPcomparing with graphite electrode, respectively, but shift very little for Ni(Ⅱ)TBPand Zn(Ⅱ)TBP.The catalytic activity was found to decrease in the order:Co(Ⅱ)TBP>ClFe(Ⅲ)TBP>Ni(Ⅱ)TBP>Zn(Ⅱ)TBP.The catalytic kinetics with Co(Ⅱ)TBPand ClFe(Ⅲ)TBPwas studied.The reaction order in OH^- is 1 for Co(Ⅱ)TBPand 2 for ClFe(Ⅲ)TBP, respectively.The order in N₂H₄ is 1 for both complexes.Tafel slopes of 118 mVfor Co(Ⅱ)TBPand 86 mVfor ClFe(Ⅲ)TBPwere obtained.

Key words: Tetrabenzoporphyrin, Catalytic electro-oxidation, Modified graphite electrode, Reaction kinetics

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ZHU Zhen-Ping, REN Jian-Guo, QIN Zi-Bin . Studies on Catalytic Electro-oxidation of Hydrazine on Modified Graphite Electrode by Coordination Compounds of d-Transition Metals with TP(ο-NO₂)TBP[J]. Chem. J. Chinese Universities, 1993, 14(12): 1710.

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Studies on Catalytic Electro-oxidation of Hydrazine on Modified Graphite Electrode by Coordination Compounds of d-Transition Metals with TP(ο-NO₂)TBP

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