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A hydrotalcite-based catalyst system for the single-stage liquid-phase synthesis of MIBK

Paper ID Volume ID Publish Year Pages File Format Full-Text
44361 46019 2006 8 PDF Available
Title
A hydrotalcite-based catalyst system for the single-stage liquid-phase synthesis of MIBK
Abstract

A comparative study was performed between Pd supported on activated hydrotalcites bi-functional catalysts and physical mixtures of activated hydrotalcites with Pd supported on carbon nanofibers for the single-stage liquid-phase synthesis of methyl isobutyl ketone from acetone and H2. Since it was found earlier that the dehydration reaction of diacetone alcohol over activated hydrotalcites is the rate-determining step in this process, Mg–Al hydrotalcites were investigated in the condensation of acetone to diacetone alcohol and its dehydration to mesityl oxide to enhance the activity. A correlation between the number of active base sites, as determined by volumetric CO2 adsorption measurements at low pressures, and the activity in the dehydration reaction could be derived. A dependency on the Pd-loading (0–1 wt%) of Pd supported on activated hydrotalcites catalysts was found in the single-stage synthesis of methyl isobutyl ketone, whereas no such an effect was found when using physical mixtures of activated hydrotalcites with Pd on carbon nanofibers. Results from TEM, CO2 chemisorption and N2 physisorption as well as catalytic experiments in the hydrogenation of mesityl oxide and of cyclohexene indicate that this dependency is largely accounted for by entrapment of Pd particles in the agglomerates of the irregular stacks of hydrotalcite platelets, making these sites inaccessible for the reactants.

Keywords
Hydrotalcite; Layered double hydroxide; LDH; Solid base catalyst; Palladium; Methyl isobutyl ketone; MIBK; Hydrogenation; Bi-functional catalyst
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A hydrotalcite-based catalyst system for the single-stage liquid-phase synthesis of MIBK
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 307, Issue 2, 3 July 2006, Pages 231–238
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