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Heterogeneous Catalytic Transformation of Citronellal to Menthol in a Single Step on Ir-Beta Zeolite Catalysts

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Neatu, Florentina Coman, Simona Parvulescu, Vasile I. Poncelet, Georges [UCL] De Vos, Dirk Jacobs, Pierre

The synthesis of menthol from citronellal was studied on bifunctional Ir/Beta zeolite catalysts, prepared via impregnation of Beta zeolite with different concentrations of Ir. The results show that Beta zeolites, impregnated with Ir, catalyze the one-pot full conversion of citronellal to menthol by consecutive acid-catalyzed cyclization and Ir-catalyzed hydrogenation. The best results (95% selectivity for the menthol isomers, of which 75% is the desired (+/-)-menthol) were recorded on 3% Ir/Beta zeolite catalyst. In contrast with earlier studies, 0.05 g Ir/Beta catalyst per mL of substrate leads to complete and selective substrate transformation. The textural properties, acidity and hydrogenation function were studied by liquid N-2 adsorption-desorption, FT-IR, XPS and hydrogen chemisorption techniques. To clarify the mechanism of the cyclization of citronellal, tests were also performed using zeolites with different acidity and loaded with other metals (Pt, Pd, Rh, Ru).

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2009
Language Anglais
Journal information "Topics in Catalysis" - Vol. 52, no. 9, p. 1292-1300 (2009)
Peer reviewed yes
Publisher Springer/plenum Publishers (New York)
issn 1022-5528
e-issn 1572-9028
Publication status Publié
Affiliation UCL
Keywords Citronellal ; Menthol ; One-pot synthesis ; Iridium ; Beta zeolite
Links
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Bibliographic reference Neatu, Florentina ; Coman, Simona ; Parvulescu, Vasile I. ; Poncelet, Georges ; De Vos, Dirk ; et. al. Heterogeneous Catalytic Transformation of Citronellal to Menthol in a Single Step on Ir-Beta Zeolite Catalysts. In: Topics in Catalysis, Vol. 52, no. 9, p. 1292-1300 (2009)
Permanent URL http://hdl.handle.net/2078.1/35491