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  Tuning the acidic properties of aluminas via sol-gel synthesis: New findings on the active site of alumina-catalyzed epoxidation with hydrogen peroxide

Rinaldi, R., Fujiwara, F. Y., Hölderich, W., & Schuchardt, U. (2006). Tuning the acidic properties of aluminas via sol-gel synthesis: New findings on the active site of alumina-catalyzed epoxidation with hydrogen peroxide. Journal of Catalysis, 244(1), 92-101. doi:10.1016/j.jcat.2006.08.024.

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 Creators:
Rinaldi, Roberto1, 2, Author              
Fujiwara, Fred Y.2, Author
Hölderich, Wolfgang3, Author
Schuchardt, Ulf2, Author
Affiliations:
1Research Group Rinaldi, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445617              
2Instituto de Química, Universidade Estadual de Campinas, PO Box 6154, 13084-971 Campinas-SP, Brazil, ou_persistent22              
3Department of Chemical Technology and Heterogeneous Catalysis, RWTH-Aachen, Worringerweg 1, 52074 Aachen, Germany, ou_persistent22              

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Free keywords: Sol-gel alumina; Catalytic epoxidation; Hydrogen peroxide
 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 °C and gave different γ-Al2O3's with distinct textural and acidic properties. A combination of 27Al MAS NMR and TPD-NH3 results of calcined aluminas allowed us to assign the type Ia AlOH sites as the catalytic sites for epoxidation. The type Ib AlOH sites have no function in catalytic epoxidation, because ethyl acetate poisons these sites. The strong acid sites of types IIa, IIb, and III AlOH groups are responsible for the undesired H2O2 decomposition and decreased oxidant selectivity.

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Language(s): eng - English
 Dates: 2006-10-032006-11-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jcat.2006.08.024
 Degree: -

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Title: Journal of Catalysis
Source Genre: Journal
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Publ. Info: San Diego, CA. : Academic Press
Pages: - Volume / Issue: 244 (1) Sequence Number: - Start / End Page: 92 - 101 Identifier: ISSN: 0021-9517
CoNE: https://pure.mpg.de/cone/journals/resource/954922645027