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Titolo:
INTERACTION OF CARBON-DIOXIDE WITH THE SURFACE OF ZIRCONIA POLYMORPHS
Autore:
BACHILLERBAEZA B; RODRIGUEZRAMOS I; GUERRERORUIZ A;
Indirizzi:
CSIC,INST CATALISIS & PETROLEOQUIM,CAMPUS CANTOBLANCO E-28049 MADRID SPAIN CSIC,INST CATALISIS & PETROLEOQUIM E-28049 MADRID SPAIN UNED,FAC CIENCIAS,DEPT QUIM INORGAN MADRID 28040 SPAIN
Titolo Testata:
Langmuir
fascicolo: 13, volume: 14, anno: 1998,
pagine: 3556 - 3564
SICI:
0743-7463(1998)14:13<3556:IOCWTS>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
STABILIZED TETRAGONAL ZRO2; METAL-OXIDE SURFACES; MAGNESIUM-OXIDE; ADSORPTION; TEMPERATURE; CATALYSTS; CO2; TRANSFORMATION; MOLECULES; BASICITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
B. Bachillerbaeza et al., "INTERACTION OF CARBON-DIOXIDE WITH THE SURFACE OF ZIRCONIA POLYMORPHS", Langmuir, 14(13), 1998, pp. 3556-3564

Abstract

A series of zirconia powder samples with different crystallographic phases and surface areas, either prepared at the laboratory or obtainedcommercially, have been studied in relation to the interaction of CO2with their surfaces. Three complementary techniques such as infrared spectroscopy, adsorption microcalorimetry, and temperature-programmed desorption have been applied to the study of the CO2 adsorption. It has been found that the crystallographic structure of ZrO2 determines the number (or density) of CO2 adsorption sites on its surface, and consequently the type and stability of adsorbed species. Upon carbon dioxide adsorption on zirconia with monoclinic structure, hydrogen carbonates and monodentate and bidentate carbonates are formed, while bidentate and polydentate carbonates are generated on tetragonal zirconia. Although the bidentate carbonates are observed on monoclinic and tetragonal zirconia, they appear at different frequencies and they have different thermal stability, confirming that the surfaces of the two zirconia phases have different geometries. The results from the three techniques applied confirm that the monoclinic structure of zirconia brings about stronger surface adsorption sites concerning CO2 than the tetragonal structure. Moreover, for a given crystallographic structure the surface area and texture of the sample also affect the strength of the surface adsorption sites.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 15:53:00