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Titolo:
FTIR STUDY OF CO AND NH3 COADSORPTION ON TIO2 (RUTILE)
Autore:
HADJIIVANOV K;
Indirizzi:
INST PHYS CHEM,SOPHIENSTR 11 D-80333 MUNICH GERMANY BULGARIAN ACAD SCI,INST GEN & INORGAN CHEM BU-1113 SOFIA BULGARIA
Titolo Testata:
Applied surface science
fascicolo: 1-4, volume: 135, anno: 1998,
pagine: 331 - 338
SICI:
0169-4332(1998)135:1-4<331:FSOCAN>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL-OXIDE SURFACES; TITANIUM DIOXIDES; CARBON-MONOXIDE; TEMPERATURE; CATALYSTS; ALCOHOLS; ANATASE;
Keywords:
CO; FTIR SPECTROSCOPY; NH3; TIO2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
K. Hadjiivanov, "FTIR STUDY OF CO AND NH3 COADSORPTION ON TIO2 (RUTILE)", Applied surface science, 135(1-4), 1998, pp. 331-338

Abstract

FTIR spectroscopy has been used to study CO and ammonia adsorption and co-adsorption on rutile. Ammonia is adsorbed coordinatively, but with time, different dissociative ammonia forms appear. At room temperature CO is adsorbed forming one type of Ti4+-CO carbonyls alone (absorption band at 2191 cm(-1)) and is oxidized to bicarbonates. At 100 K CO occupies, at first, the sites detected at room temperature, whereas the increase in amount of adsorbed CO results in new adsorption forms: (i) CO adsorbed on titanium cations inert at room temperature (monitored by an intense band with a maximum at 2183 cm(-1)), (ii) CO adsorbed on hydroxyl groups (band at 2150 cm(-1)), and (iii) physically adsorbed CO (band at 2140 cm(-1)). Pre-adsorbed ammonia decreases the acidityof both, the Lewis acid sites and the surface Ti4+-OH groups. Low-temperature CO adsorption on rutile partly poisoned by ammonia allows to detect only the sites inert towards CO adsorption at room temperature. On the basis of the results obtained, the active sites for adsorptionof ammonia and CO are discussed and comparison between the surface properties of anatase and rutile is made. (C) 1998 Elsevier Science B.V. All rights reserved.

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Documento generato il 02/07/20 alle ore 19:21:40