Reactions on titanium dioxide: The photo-oxidation of ammonia

Autor:	M. Ritchie, W. R. McLean
Rok vydání:	1965
Předmět:	Inorganic chemistry chemistry.chemical_element Nitrous oxide Photochemistry Toxicology Oxygen Nitric oxide chemistry.chemical_compound Ammonia Adsorption chemistry Titanium dioxide Molecule Nitrite
Zdroj:	Journal of Biochemical Toxicology. 15:452-460
ISSN:	1522-7146 0887-2082
DOI:	10.1002/jbt.2570151003
Popis:	The adsorption at room temperature of small amounts of ammonia on precipitated titanium dioxide was accompanied by the release of water in unit molecular ratio. When titanium dioxide films were illuminated with light of wavelength 3650–4350 A in the presence of ammonia and oxygen, photo-oxidation of ammonia occurred, in which the oxygen used appeared mainly as water; small amounts only of nitrous oxide and of nitrite were found. Three molecules of ammonia reacted with two molecules of oxygen to give four molecules of water. Consideration of the amounts of oxygen separately photosorbed, of ammonia thermally adsorbed and photo-oxidised, and of nitric oxide photo-decomposed, leads to the conclusion that common reaction sites on the dioxide surface are concerned. These reactions and the photodecomposition of nitric oxide on an ammonia-treated surface. are interpreted in terms of Lewis-type reaction centres, involving water or ammonia.
Databáze:	OpenAIRE
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