Electrode catalyst for electrolytic reduction of carbon dioxide

Details Electrode catalyst for electrolytic reduction of carbon dioxide Electrode catalyst for electrolytic reduction of carbon dioxide

1991-04-24

1994-02-08

Gorgos, Kathryn

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204290R, 502167, 502315, 252519, 556138, 544225, 544246, 544296, C25B 1106

Patent

active

052845630

ABSTRACT:
An electrocatalyst for use in electrolytic reduction of carbon dioxide gas in an aqueous solution. The electrocatalyst is formed of nickel alkyl cyclam which is expressed by the general formula: ##STR1## where each of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 is selected from the group consisting of hydrogen atom and aliphatic saturated hydrocarbon group expressed by the formula of C.sub.n H.sub.2n+1 ; wherein at least one of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 is the aliphatic saturated hydrocarbon group in which n is a number ranging from 1 to 22. The nickel alkyl cyclam as the electrocatalyst is excellent in stability and energy consumption improving effect while exhibiting a high carbon dioxide gas reduction effect, as compared with conventional nickel cyclam.

REFERENCES:
Wagner et al., J. Am. Chem. Soc. "Preparation of Macrocyclic Tertiary Amine Complexes of Nickel (II), by Alkylation of Coordinated Amine Crystal Structure of a Monoazido Bridged Dimer of Ni(N-Tetramethylcyclam)2.sup.+," USA, vol. 96, No. 8, Apr. 17, 1974.
Marc Beley et al., "Electrocatalytic Reduction of CO.sub.2 by Ni Cyclam.sup.2+ in Water: Study of the Factors Affecting the Efficiency and the Selectivity of the Process" J. Am. Chem. Soc. 1986, 108, pp. 7461-7467.
Iwao Tabushi et al. "Preparation of C-Alkylated Macrocyclic Polyamines" Tetrahedron Letters No. 12, 1977 pp. 1049-1052.
Mario Ciampolini et al. "Steric Effects on the Solution Chemistry of Nickel(II) Complexes with N-Monomethylated 14-Membered Tetraaza Macrocycles. The Blue-to-Yellow Conversion and the Oxidation and Reduction Behavior" Inorg Chem. 1986, 25, pp. 4131-4135.
Mario Ciampolini et al. "Dinickel and Dicopper Complexes with N,N-Linked Bis(cyclam) Ligands. An Ideal System for the Investigation of Electrostatic Effects on the Redox Behavior of Pairs of Metal Ions" Inorg. Chem. 1987, 26 pp. 3527-3533.
Mafer et al., "Azacyclobutadiene", Tetrahedron Letters, No. 12, pp. 1053-1056, 1977.
Fujihara et al, "Electrocatalytic reduction of CO.sub.2 by nickel(II) cylam Study of the reduction mechanism on mercury by cyclic voltammetry, polarography and electrocapillarity", J. Electroanal. Chem., 292, pp. 199-215 (1990).

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