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Influence of composition and preparation method on the activity of MnOx/Al2O3 catalysts for the reduction of benzaldehyde with ethanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
43666 45981 2007 6 PDF Available
Title
Influence of composition and preparation method on the activity of MnOx/Al2O3 catalysts for the reduction of benzaldehyde with ethanol
Abstract

Two series of MnOx/Al2O3 catalysts with varying Mn loading (0–1.2%, w/w Mn) prepared by equilibrium deposition filtration (EDF) and wet impregnation (WI) methodology were used for studying the influence of the composition and the preparation method on their activity for the reduction of benzaldehyde with ethanol. The prepared catalysts were characterized by BET measurements, X-ray photoelectron spectroscopy and diffuse reflectance UV–vis spectroscopy. It was found that following EDF methodology, the deposition of MnOx species on the alumina takes place via adsorption of [Mn(H2O)6]2+ and [Mn–Ac]+ species on the negatively charged surface sites. On the contrary, following wet impregnation the deposition takes place mainly via precipitation in the step of the solvent evaporation. The extent of the interactions exerted between the support and supported phase is higher in the EDF samples. These interactions created during the impregnation step were detected by DRS after drying and calcination. Higher dispersion of the MnOx phase is achieved when it is deposited on the γ-Al2O3 surface by the EDF than the WI method. The catalysts of the first series exhibited higher activity related well with the dispersion of MnOx supported nano-particles.

Keywords
MnOx/Al2O3 catalysts; Supported manganese oxide catalysts; Equilibrium deposition filtration; MPVO reaction; Active sites
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Influence of composition and preparation method on the activity of MnOx/Al2O3 catalysts for the reduction of benzaldehyde with ethanol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 325, Issue 2, 15 June 2007, Pages 322–327
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us