Preparation of nanodispersed titania using stabilized ammonium nitrate melts

• Published in: Journal of solid state chemistry Vol. 183; no. 10; pp. 2438 - 2444
• Main Authors: Raciulete, Monica, Kachina, Anna, Puzenat, Eric, Afanasiev, Pavel
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01-10-2010; Elsevier
• Subjects: AMIDES; AMINES; Ammonit nitrate; AMMONIUM COMPOUNDS; AMMONIUM NITRATES; AZINES; CARBONIC ACID DERIVATIVES; CARBOXYLIC ACID SALTS; CARBOXYLIC ACIDS; CATALYSIS; CATALYSTS; CHALCOGENIDES; CHEMICAL REACTIONS; Chemical Sciences; Chemistry; CHLORINE COMPOUNDS; Crystallites; Environment and Society; Environmental Sciences; Exact sciences and technology; FORMIC ACID; General and physical chemistry; General, apparatus; HALOGEN COMPOUNDS; HEATING; HETEROCYCLIC COMPOUNDS; MATERIALS SCIENCE; MELAMINE; MONOCARBOXYLIC ACIDS; Nanostructure; NANOSTRUCTURES; NITRATES; NITROGEN COMPOUNDS; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; OXALATES; OXIDATION; OXIDES; OXYCHLORIDES; OXYGEN COMPOUNDS; OXYHALIDES; PHOTOCATALYSIS; Photocatalyst; Precursors; Surface physical chemistry; SYNTHESIS; TEMPERATURE RANGE; TEMPERATURE RANGE 0400-1000 K; Titania; TITANIUM COMPOUNDS; Titanium dioxide; TITANIUM OXIDES; TRANSITION ELEMENT COMPOUNDS; TRIAZINES; UREA; Titania; Photocatalyst; Formic acid; Ammonit nitrate; High performance; Heat treatment; Molten state; Oxalate; Photocatalysis; Nitrates; Organic nitrogen compounds; Precursor; Urea; Crystallites; Oxidation; Titanium oxide; Catalyst activity; Catalyst; Organic compounds
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2010.07.049

An expedite one-step approach using simple precursors has been proposed to obtain metallic oxide compounds and exemplified by preparation of highly dispersed TiO
2. The technique consists in heating to 400–500
°C of molten ammonium nitrate stabilized with an organic nitrogen-containing compound (urea, melamine, ammonium oxalate) and containing dissolved metal salt precursor (TiOCl
2). The crystallites of the resulting TiO
2 demonstrated variable size and shape as a function of stabilizer used. Their activity in photocatalytic oxidation of formic acid also depends on the nature of the stabilizer. The catalysts as-prepared showed high photocatalytic performance, superior to that of the Degussa P25 reference. Nitrogen containing stabilizers play a double role of increasing the process safety and modifying the properties of the solid products.
Ammonium nitrate melts stabilized by nitrogen-containing organic molecules can be applied for expedite one-step preparation of highly dispersed oxides, as exemplified by synthesis of titania photocatalysts.
▪