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Titolo:
INTERCALATION COMPOUNDS OF ALPHA-ZIRCONIUM HYDROGEN PHOSPHATE WITH RH3-DIAMINE COMPLEXES .2. THEIR BEHAVIOR TOWARDS CO, CO2 AND H-2 AND THEIR USE IN THE CO CATALYTIC-OXIDATION( IONS AND RH3+)
Autore:
GIANNOCCARO P; LAGINESTRA A; MASSUCCI MA; FERRAGINA C; MATTOGNO G;
Indirizzi:
UNIV BARI,CNR,DIPARTIMENTO CHIM,4 TRAV RE DAVID I-70126 BARI ITALY UNIV BARI,CNR,CTR MIXTO I-70126 BARI ITALY UNIV ROMA LA SAPIENZA,DIPARTIMENTO CHIM I-00185 ROME ITALY CNR,IMAI,AREA RIC I-00016 MONTEROTONDO ROME ITALY CNR,ICMAT,AREA RIC I-00016 MONTEROTONDO ROME ITALY
Titolo Testata:
Journal of molecular catalysis. A, Chemical
fascicolo: 1-2, volume: 111, anno: 1996,
pagine: 135 - 144
SICI:
1381-1169(1996)111:1-2<135:ICOAHP>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAY PHOTOELECTRON-SPECTROSCOPY; RHODIUM; CARBONYLATION; CARBON; WATER;
Keywords:
ZIRCONIUM HYDROGEN PHOSPHATE; INTERCALATION; RHENIUM COMPLEXES; CATALYTIC OXIDATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
P. Giannoccaro et al., "INTERCALATION COMPOUNDS OF ALPHA-ZIRCONIUM HYDROGEN PHOSPHATE WITH RH3-DIAMINE COMPLEXES .2. THEIR BEHAVIOR TOWARDS CO, CO2 AND H-2 AND THEIR USE IN THE CO CATALYTIC-OXIDATION( IONS AND RH3+)", Journal of molecular catalysis. A, Chemical, 111(1-2), 1996, pp. 135-144

Abstract

The reactivity of Rh3+ ions and Rh3+-diamine alpha-Zr(HPO4)(2) . H2O complexes intercalated in alpha-zirconium hydrogen phosphate towards small molecules (CO, O-2, H-2) was studied. The compounds only containing Rh3+ ions, of composition ZrHxRhy(PO4)(2) . H2O (x = 2 - 3 y; 0 < yless than or equal to 0.66) react with CO at atmospheric pressure andtemperatures ranging from 80 to 100 degrees C, and undergo selective reduction of Rh3+ to Rh1+. The resulting materials containing Rh1+ arereoxidized to Rh3+ by molecular dioxygen under the same pressure and temperature conditions, The simultaneous action of a CO/O, mixture determines the catalytic oxidation of the CO to CO2 and the system acts as a stable catalyst of this reaction, At higher temperatures, the reduction of Rh3+ is no longer selective and in these conditions Rh-0 is formed, which escapes from the support and causes its deactivation. Similar behaviour is found in systems containing Rh3+-diamine complexes, which react with CO at temperatures higher than 120 degrees C and undergo an irreversible reduction of Rh3+ to Rh-0. The reaction with H-2 (70 < T < 100 degrees C) also causes a non selective reduction of the Rh3+ to Rh1+ and Rh-0. The progress over time of the catalytic activityof some compounds with different contents of Rh3+ in converting CO toCO2 has shown not only that these materials maintain a constant catalytic activity, indicating the stability of the systems to the loss of metal during working cycles, but also that Rh3+ supported in these matrixes is more active and selective in this type of reaction than Rh3+ in solution.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 00:22:42