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Titolo:
Catalysis by porous heteropoly compounds
Autore:
Okuhara, T; Nakato, T;
Indirizzi:
Hokkaido Univ, Grad Sch Environm Earth Sci, Sapporo, Hokkaido 060, Japan Hokkaido Univ Sapporo Hokkaido Japan 060 ci, Sapporo, Hokkaido 060, Japan
Titolo Testata:
CATALYSIS SURVEYS FROM JAPAN
fascicolo: 1, volume: 2, anno: 1998,
pagine: 31 - 44
SICI:
1384-6574(199805)2:1<31:CBPHC>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHAPE-SELECTIVE CATALYSIS; LIQUID-PHASE HYDRATION; PORE-SIZE DISTRIBUTION; CESIUM HYDROGEN SALTS; TOLERANT SOLID ACID; 12-TUNGSTOPHOSPHORIC ACID; N-BUTANE; SKELETAL ISOMERIZATION; SUPERACID CATALYSTS; EXCESS WATER;
Keywords:
porous heteropoly compounds; Pt-promoted heteropoly compounds; shape selectivity; water-tolerant catalyst; hydrogenation; oxidation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
76
Recensione:
Indirizzi per estratti:
Indirizzo: Okuhara, T Hokkaido Univ, Grad Sch Environm Earth Sci, Sapporo, Hokkaido 060, Japan Hokkaido Univ Sapporo Hokkaido Japan 060 , Hokkaido 060, Japan
Citazione:
T. Okuhara e T. Nakato, "Catalysis by porous heteropoly compounds", CATAL SURV, 2(1), 1998, pp. 31-44

Abstract

This paper attempts to review recent works on catalysis of porous heteropoly compounds. The salts of heteropolyacids having Keggin structure with large cations like Cs+ and NH4+ are porous materials. For Cs hydrogen salts, the pore width can be controlled by the Cs content. Cs(2.5)H(0.5)Pw(12)O(40)has the largest amount of protons on the surface among the acidic Cs saltsand possesses pores with bimodal distribution in the micro and meso region. Efficient performances were demonstrated for acid-catalyzed reactions such as skeletal isomerization of n-butane in solid-gas system, alkylation andacylation in solid-liquid system, and hydrolysis and hydration in solid-water system. A microporous salt, CS2.2H0.8PW12O40, exhibited reactant shape selectivity towards direct decomposition of eaters. Furthermore, an ultramicroporous bifunctional catalyst, Pt-CS2.1H0.9PW12O40 Of which the pure width is around 5 Angstrom, exhibits reactant shape selectivity for hydrogenation of alkenes and oxidation of hydrocarbons, and product shape selectivity for skeletal isomerization of n-butane.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 12:57:47