Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Catalytic conversion of methanol to olefins on SAPO-n (n=11, 34, and 35), CrAPSO-n, and Cr-SAPO-n molecular sieves
Autore:
Zhu, ZD; Hartmann, M; Kevan, L;
Indirizzi:
Univ Houston, Dept Chem, Houston, TX 77204 USA Univ Houston Houston TX USA 77204 uston, Dept Chem, Houston, TX 77204 USA Univ Kaiserslautern, Dept Chem Chem Technol, D-67763 Kaiserslautern, Germany Univ Kaiserslautern Kaiserslautern Germany D-67763 iserslautern, Germany
Titolo Testata:
CHEMISTRY OF MATERIALS
fascicolo: 9, volume: 12, anno: 2000,
pagine: 2781 - 2787
SICI:
0897-4756(200009)12:9<2781:CCOMTO>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
NICKEL SILICOALUMINOPHOSPHATE CATALYST; LIGHT OLEFINS; ADSORBATE INTERACTIONS; HYDROCARBONS; FRAMEWORK; CHROMIUM; LOCATION; TEMPLATE; ACIDITY; ETHENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Kevan, L Univ Houston, Dept Chem, Univ Pk, Houston, TX 77204 USA Univ Houston Univ Pk Houston TX USA 77204 , Houston, TX 77204 USA
Citazione:
Z.D. Zhu et al., "Catalytic conversion of methanol to olefins on SAPO-n (n=11, 34, and 35), CrAPSO-n, and Cr-SAPO-n molecular sieves", CHEM MATER, 12(9), 2000, pp. 2781-2787

Abstract

The catalytic conversion from methanol to olefins has been studied for SAPO-11 SAPO-34, and SAPO-35 silicoaluminophosphate molecular sieves with and without chromium incorporation. The selectivity for methanol conversion to ethene and propene has been investigated as a function of structure type, silica content, chromium location, and chromium concentration. Among protonated H-SAPO-n materials, SAPO-34 shows the highest selectivity for ethene and propene, whereas SAPO-11 shows the longest lifetime for catalytic activity. The variation of silicon content indicates that there is an optimum silicon content in SAPO-34 for the best catalytic activity. Incorporation of Crinto the framework of SAPO-n increases the lifetime and the selectivity toward ethene compared with those from Cr incorporation by ion exchange. Thisis interpreted as an acidity difference between synthesized CrAPSO-n and ion-exchanged Cr-SAPO-n. CrAPSO-11 also increases the lifetime, the distribution of ethene and propene, and the selectivity toward ethene compared withSAPO-11. However, SAPO-34 and CrAPSO-34 with higher Si content compared tothat of SAPO-11 show similar selectivity toward ethene and propene, but CrAPSO-34 has a longer lifetime. The chromium influence is smaller in CrAPSO-34 compared to CrAPSO-11. With an increase in Cr amount, CrAPSO-11 shows higher selectivity toward ethene and propene and has a longer lifetime.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 05:57:59