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A new peroxo-route for the synthesis of Mg–Zr mixed oxides catalysts: Application in the gas phase acetone self-condensation

Paper ID Volume ID Publish Year Pages File Format Full-Text
39704 45832 2014 8 PDF Available
Title
A new peroxo-route for the synthesis of Mg–Zr mixed oxides catalysts: Application in the gas phase acetone self-condensation
Abstract

•Mg–Zr mixed oxides have been synthesized by a peroxo-route, by Pechini-type method.•XRD analysis reveals a high degree of molecular homogeneity.•These materials are active catalysts in the self condensation of acetone.•High selectivity for the formation of linear dimerization and trimerization adducts.

We propose in this manuscript a new peroxo-mediated procedure for preparing magnesia–zirconia mixed oxides, with Mg/Zr molar ratio between 1 and 3, with enhanced distribution of basic sites. The mixed magnesia–zirconia oxides have been prepared from the gelled complex by Pechini-type method. The MgO–ZrO2 materials have been characterized and used as catalysts for acetone aldol condensation. The proposed preparation method provides a high degree of molecular homogeneity and favours the formation of magnesia-stabilized zirconia phase. Acetone gas-phase self-condensation was carried out over these catalysts as model reaction requiring the presence of basic sites. The condensation yields diacetone alcohol and mesityl oxide as mean C6 products, and phorones, isophorones and mesitylene as C9 products. In comparison to Mg–Zr oxide prepared by co-precipitation, these new materials present better conversions and higher selectivity to linear dimers and trimers (as mesitylene), whereas the selectivity for isophorones is significantly lower.

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Keywords
Magnesia–zirconia; Acetone condensation; Aldol condensation; Zirconium peroxocomplex
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A new peroxo-route for the synthesis of Mg–Zr mixed oxides catalysts: Application in the gas phase acetone self-condensation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 477, 5 May 2014, Pages 26–33
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
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