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Abstract

In a comprehensive investigation both homogeneous and heterogeneous systems have been studied for the photodissociation of water by sunlight. It has been attempted throughout, to study reaction mechanisms, monitor reactive intermediates, analyse any gaseous products quantitatively and obtain reproducible results. Photodissociation of water in homogeneous solution must be based on a photoredox reaction. It has been possible to optimize the partitioning of an ion pair intermediate in favour of ion products, which can be used to reduce or oxidize water with the aid of active catalysts: ultrafine stable Pt colloids for H-2, RuO-2 on an inert oxide support for O-2. Photodissociation of water under heterogeneous systems: via semiconductor powders loaded with catalytic deposits: models for H-2 evolution from water based on CdS, for O-2 based on CdO or WO-3; complete photodissociation with TiO-2 loaded with small deposits of RuO-2. A thin film of Pt applied to the semiconductor surface improves the yield of gaseous substances.

Additional information

Authors: HARRIMAN A, DAVY FARADAY RESEARCH LABORATORY, LONDON (UK);PORTER G DAVY FARADAY RESEARCH LABORATORY, LONDON (UK), DAVY FARADAY RESEARCH LABORATORY, LONDON (UK)
Bibliographic Reference: EUR 9113 EN (1984) MF, 61 P., BFR 120, BLOW-UP COPY BFR 305, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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