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Titolo:
PREPARATION, CHARACTERIZATION AND MICROCALORIMETRIC STUDIES OF NICKEL-IRON HYDROTALCITES AND THEIR DECOMPOSITIONS
Autore:
TU M; SHEN JY; CHEN Y;
Indirizzi:
NANJING UNIV,DEPT CHEM NANJING 210093 PEOPLES R CHINA NANJING UNIV,DEPT CHEM NANJING 210093 PEOPLES R CHINA
Titolo Testata:
Thermochimica acta
fascicolo: 1-2, volume: 302, anno: 1997,
pagine: 117 - 124
SICI:
0040-6031(1997)302:1-2<117:PCAMSO>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
METAL-OXIDE SURFACES; FISCHER-TROPSCH CATALYSTS; THERMAL-DECOMPOSITION; BASE PROPERTIES; ADSORPTION; MOSSBAUER; ALUMINA; ACID; FE; OXIDATION;
Keywords:
NI-FE HYDROTALCITE; NIFEO MIXED OXIDES; TG-DTA; ADSORPTIVE MICROCALORIMETRY; SURFACE ACIDITY AND BASICITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
M. Tu et al., "PREPARATION, CHARACTERIZATION AND MICROCALORIMETRIC STUDIES OF NICKEL-IRON HYDROTALCITES AND THEIR DECOMPOSITIONS", Thermochimica acta, 302(1-2), 1997, pp. 117-124

Abstract

Ni-Fe hydrotalcites with Ni/Fe molar ratios of 1, 2, 3, 6 and 10 wereprepared by coprecipitation. TG-DTA results showed that the hydrotalcites decomposed in two stages, corresponding to two endothermic peaks around 200 and 300 degrees C. After calcination at 400 degrees C, the hydrotalcites were converted to NiFeO mixed oxides with high surface areas around 100 m(2)/g, which exhibited the XRD pattern of NiO only. TPR studies of the mixed oxides indicated that the reduction temperatures decreased with increasing Ni content, inconsistent with the in situMossbauer spectroscopic results which showed that the mixed oxide (Ni/Fe = 2) was easier to reduce than the Fe2O3 sample. Microcalorimetricadsorption of NH3 and CO2 revealed that the mixed oxide (Ni/Fe = 2) displayed intermediate acidity and basicity between those of the pure oxide NiO and Fe2O3. The mixed oxides after calcination at 800 degrees C possessed the phases of NiO and NiFe2O4 with the surface area around15 m(2)/g, which exhibited moderate basicity with only a little weak acidity. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 01:48:22