Proceedings of the 1986 International Congress on Renewable Energy Sources. Photochemical reduction of carbon dioxide by V(III) (BPY)2 chloride and methyl viologen. International Congress on Renewable Energy Sources [18-23 Mayo 1986, Madrid].

Consejo Superior de Investigaciones Científicas.
Aliwi, S.M. Al-Daghstani, I.K.

1987

CIENA
1113
v. 2

84-00-66-74-X

In this paper we have attempted to photoreduce carbon dioxide in aqueous solution (pH=3.7) to C-1 organic compounds in the presence of methyl viologen and EDTA or TEOA. We have shown that this photochemical reduction is sensitized by vanadium (III) bis (bipyridyl) complex (max. 620nm and 510nm) with ethylenediamine tetraacetic acid (Na-salt) and triethanol amine as a photoreducing agents, and methyl viologen (MV+2) as a photoelectron acceptor. Visible light (Xe-lamp) of 80 mW/cm2 is used for irradiation at 25ºC. It was found that the photoreduction products are formaldehyde and traces of formic acid. On the bases of mechanism for this photoinduced electron relay system. The results show that about 12 moles of photon are required to reduce one mole of carbon dioxide. ABSTRACT. INTRODUCTION. EXPERIMENTAL. Materials. Apparatus. RESULTS AND DISCUSSION. REFERENCES.

Presenta gráfs. y tbls.

GENERAL; ENERGIA ELECTRICA; REACCIONES FOTOQUIMICAS; CONVERSION DE LA ENERGIA; ANHIDRIDO CARBONICO; EXPERIMENTOS;