dc.contributor | Universidade Estadual Paulista (Unesp) | |
dc.contributor | RWTH Aachen University | |
dc.date.accessioned | 2014-05-20T15:27:53Z | |
dc.date.accessioned | 2022-10-05T16:45:59Z | |
dc.date.available | 2014-05-20T15:27:53Z | |
dc.date.available | 2022-10-05T16:45:59Z | |
dc.date.created | 2014-05-20T15:27:53Z | |
dc.date.issued | 2006-11-15 | |
dc.identifier | Journal of Catalysis. San Diego: Academic Press Inc. Elsevier B.V., v. 244, n. 1, p. 92-101, 2006. | |
dc.identifier | 0021-9517 | |
dc.identifier | http://hdl.handle.net/11449/37809 | |
dc.identifier | 10.1016/j.jcat.2006.08.024 | |
dc.identifier | WOS:000242130100011 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/3909260 | |
dc.description.abstract | This study answers several pending questions about alumina-catalyzed epoxidation with aqueous 70 wt% H2O2. To evaluate the effect of the water-to-aluminum tri-sec-butoxide molar ratio, this was systematically changed from 1 to 24. The xerogels were calcined at 450 degrees C and gave different gamma-Al2O3's with distinct textural and acidic properties. A combination of Al-27 MAS NMR and TPD-NH3 results of calcined aluminas allowed us to assign the type la. Al-OH sites as the catalytic sites for epoxidation. The type Ib Al-OH sites have no function in catalytic epoxidation, because ethyl acetate poisons these sites. The strong acid sites of types IIa, IIb, and III Al-OH groups are responsible for the undesired H2O2 decomposition and decreased oxidant selectivity. (c) 2006 Elsevier B.V. All rights reserved. | |
dc.language | eng | |
dc.publisher | Elsevier B.V. | |
dc.relation | Journal of Catalysis | |
dc.relation | 6.759 | |
dc.relation | 2,397 | |
dc.rights | Acesso restrito | |
dc.source | Web of Science | |
dc.subject | sol-gel alumina | |
dc.subject | catalytic epoxidation | |
dc.subject | hydrogen peroxide | |
dc.title | Tuning the acidic properties of aluminas via sol-gel synthesis: New findings on the active site of alumina-catalyzed epoxidation with hydrogen peroxide | |
dc.type | Artigo | |