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Titolo:
ADSORPTION OF CO ON MGO SURFACE - CHARACTERIZATION OF ADSORBED SPECIES
Autore:
TASHIRO T; ITO J; SIM RB; MIYAZAWA K; HAMADA E; TOI K; KOBAYASHI H; ITO T;
Indirizzi:
OTSUMA WOMENS UNIV,SCH SOCIAL INFORMAT STUDIES,DEPT ENVIRONM SCI TOKYO 206 JAPAN OTSUMA WOMENS UNIV,SCH SOCIAL INFORMAT STUDIES,DEPT ENVIRONM SCI TOKYO 206 JAPAN TOKYO METROPOLITAN UNIV,FAC SCI,DEPT CHEM HACHIOJI TOKYO 19203 JAPAN TOKYO METROPOLITAN HACHIOI TECH HIGH SCH HACHIOJI TOKYO 193 JAPAN KYOTO PREFECTURAL UNIV,FAC SCI LIVING,DEPT APPL CHEM,SAKYO KU KYOTO 606 JAPAN
Titolo Testata:
Journal of physical chemistry
fascicolo: 16, volume: 99, anno: 1995,
pagine: 6115 - 6122
SICI:
0022-3654(1995)99:16<6115:AOCOMS>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBON-MONOXIDE; MAGNESIUM-OXIDE; ROOM-TEMPERATURE; HYDROGEN; SITE; FTIR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
T. Tashiro et al., "ADSORPTION OF CO ON MGO SURFACE - CHARACTERIZATION OF ADSORBED SPECIES", Journal of physical chemistry, 99(16), 1995, pp. 6115-6122

Abstract

Characterization of CO species adsorbed on well-degassed surfaces of polycrystalline MgO at low CO pressures (< 1300 Pa) and at and below room temperature was studied by using temperature-programmed desorption(TPD) and infrared (LR) spectroscopies. Mutual transformation betweenadsorbed species stable at room temperature, and their reactivities with O-2 were also investigated. Adsorbed species are classified into five groups, K-0, K-1 (and K-1'), K-2, K-3, and K-4. Among them speciesK-0 and K-1 (and K-1') are stable only below room temperature while species K-2 to K-4 are stable above this temperature. Species K-0 is a linear-type CO monomer with the C atom bonded to surface Mg2+ and has five subspecies depending on its circumstance, while all the other species K-1 to K-4 are formed on surface O2- to which the C atom is linked. A chained-type CO monomer, K-1, is reversibly transformed at ca. 230 K in the presence of gaseous CO into a linear-type CO monomer, K-1'. Species K-2 is a chained-type tetramer of CO with a carbonyl CO bond and resonanced bonds. There are two subspecies, K-2A and K-2X, which are formed by the addition of one CO molecule to corresponding trimer species, K-3A and K-3X, respectively, in the presence of gaseous CO. K-2A and K-2X are reversibly transformed into K-3A (at 400 K) and K-3X (in 300-400 K), respectively, by the elimination of the CO added. Thereare two more subspecies, K-3B and K-3C, in species K-3, but they haveno corresponding K-2 subspecies, and hence no transformations occur. All the K-3 species seem to be a linear-type trimer with a ketenic group, > C=O=O, and are desorbed in 520-580 K. Species K-4, though detailed information is not obtained, consists of three subspecies K-4A, K-4B, and K-4C, but no transformations between species K-3 and K-4 are observed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/04/20 alle ore 02:23:13