Showing papers on "Photocatalysis published in 1980"
TL;DR: Xe-Lamp irradiation of TiO2 powders mixed with a Pt, Pd, RuO2, or rhodium complex leads to the efficient production of hydrogen from liquid methanol and water at room temperature as mentioned in this paper.
Abstract: Xe-Lamp irradiation of TiO2 powders mixed with a Pt, Pd, RuO2, or rhodium complex, leads to the efficient production of hydrogen from liquid methanol and water at room temperature.
340 citations
TL;DR: Ikuichiro Izumi, Wendell W Dunn, Keith O. Wilbourn, Fu-Ren F. Fan, and Allen J. Bard as mentioned in this paper proposed a homogeneous photocatalytic oxidation of hydrocarbons on platinized titanium dioxide powders.
Abstract: The Journal of Physical Chemistry is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Heterogeneous photocatalytic oxidation of hydrocarbons on platinized titanium dioxide powders Ikuichiro Izumi, Wendell W. Dunn, Keith O. Wilbourn, Fu-Ren F. Fan, and Allen J. Bard J. Phys. Chem., 1980, 84 (24), 3207-3210• DOI: 10.1021/j100461a015 • Publication Date (Web): 01 May 2002 Downloaded from http://pubs.acs.org on February 13, 2009
188 citations
TL;DR: In this paper, a photocatalytic synthesis of ammonia from water and nitrogen was performed using binary wafered catalysts prepared with semiconductor powder (TiO2, SrTiO3, CdS or GaP).
113 citations
95 citations
TL;DR: In uv irradiated aqueous suspension of anatase, I− ion are oxidised in the presence of O2 at a conversion ≈ 80 times greater than that for Br− ion, whereas Cl− ion withstand oxidation as discussed by the authors.
Abstract: In uv irradiated aqueous suspension of anatase, I– ion are oxidised in the presence of O2 at a conversion ≈ 80 times greater than that for Br– ions, whereas Cl– ions withstand oxidation The quantum yields (≈ 2 % for I–) have been determined and discussed The nature of the final products depends on the pH, ie, halogens or hypohalite ions in acidic or basic medium, respectively However, the kinetics of the oxidation is not greatly influenced by the pH varying from 0 to 14 The reaction rate is proportional to the surface coverage in halide ions which is of the Langmuir type We tentatively suggest that the reaction proceeds via the neutralization of adsorbed O– ions by photogenerated holes producing activated oxygen species which oxidize adsorbed halide ions into hypohalite ions
75 citations
68 citations
TL;DR: In this paper, a photochemical slurry reactor was used to carry out the photochemical oxidation of formic acid by oxygen in contact with anatase, and care was exercised to avoid limitations due to light absorption and to diffusion of oxygen from the gas phase to the catalytic surface.
54 citations
TL;DR: In this paper, it was shown that hydrogen production occurs at the illuminated surface of metal-free crystals, implying a mechanism rather different from that operating in SrTiO 3 /Pt photoelectrochemical cells.
35 citations
28 Aug 1980
TL;DR: In this paper, a mechanism for the reaction based on photogeneration of hydroxyl radicals at the TiO2 surface is proposed, which yields predominantly CO2 as the reaction product.
Abstract: : The photodecomposition in oxygen-containing solutions at platinized TiO2 yields predominantly CO2 as the reaction product, with intermediate production of hydroxylated compounds. A mechanism for the reaction based on photogeneration of hydroxyl radicals at the TiO2 surface is proposed. (Author)
34 citations
TL;DR: By using a physical mixture of powdered Texas lignite and platinized titania in the presence of water vapor and ultraviolet light, it was shown that a catalytic reaction occurs at 23/sup 0/C to form hydrogen and carbon dioxide as mentioned in this paper.
Abstract: By using a physical mixture of powdered Texas lignite and platinized titania in the presence of water vapor and ultraviolet light, it is shown that a catalytic reaction occurs at 23/sup 0/C to form hydrogen and carbon dioxide. These results are contrasted with a recent electrochemical conversion process.
27 citations
01 Jan 1980
TL;DR: In this article, the application of spin trapping to the photochemical reactions which occur upon illumination of pigment dispersions is discussed, where a molecule (spin trap) is incorporated into the dispersion which reacts with the short-lived radical thereby generating a more stable nitroxide radical.
Abstract: Heterogeneous photocatalysis employing semiconducting particles dispersed in a liquid phase is often considered to involve radical intermediates. Direct detection by electron spin resonance of these intermediates is usually precluded due to the short lifetime of the radicals. The technique of spin trapping circumvents this problem by incorporating a molecule (spin trap) into the dispersion which reacts with the short-lived radical thereby generating a more stable nitroxide radical. This paper discusses the application of spin trapping to the photochemical reactions which occur upon illumination of pigment dispersions. Aqueous dispersions of inorganic pigments such as ZnO, CdS and TiO2 have been studied. Identification of the hydroxyl radical with ZnO and TiO2 and of the ·CO2 - radical when formate or oxalate is present in any of the systems is explained by oxidation with valence band holes. Superoxide anion, observed with CdS and TiO2 is explained by reduction with conduction band electrons. The organic pigment phthalocyanine, also photogenerates the superoxide anion.