Journal
CATALYSIS TODAY
Volume 97, Issue 4, Pages 249-255Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2004.07.002
Keywords
hydrous zirconia; grafted zirconium 1-propoxide; Zr-zeolite beta; MPV reduction of citral; geraniol; nerol
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Zirconium-containing catalysts were found to be active in the Meerwein-Ponndorf-Verley (MPV) reduction of citral. Good activity and selectivity to the reduced alcohol, geraniol and nerol, were observed over hydrous zirconia and zirconium 1-propoxide supported on silica. In particular, hydrous zirconia calcined at temperatures below 300 degreesC was highly active. Hydrous zirconia catalysts modified by NaOH, NH4F, PO4 (3-) and SO4 (2 -) had lower activity. Surface hydroxyl groups are postulated to be involved in ligand exchange with the reductant, 2-propanol. Zr-zeolite beta showed high activity, but poorer selectivity than the other two samples, due to subsequent dehydration of the product formed. For all catalysts, the trans-isomer of citral was preferentially reduced over the cis-isomer. (C) 2004 Elsevier B.V. All rights reserved.
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