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Kinetics of liquid phase cyclohexene hydrogenation on Pd–Al/biomorphic carbon catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
53718 46981 2015 10 PDF Available
Title
Kinetics of liquid phase cyclohexene hydrogenation on Pd–Al/biomorphic carbon catalysts
Abstract

•Pd–Al/biomorphic carbon catalysts are active for liquid-phase hydrogenation reactions.•Pd–Al/BC catalysts are prepared by a reactive technique under reductive atmosphere at high temperature.•In situ real-time Raman probe technique is a powerful tool to follow liquid-phase hydrogenation reactions.•The kinetic model developed considers the existence of two types of metallic sites on the Pd surface and non-competitive adsorption.•The values of apparent kinetic orders and activation energy of the power-law model, depend on the operating conditions.

The biomorphic mineralization technique is a powerful tool that allows to synthetize inorganic materials using as templates some structures of biological origin. This work presents kinetics results obtained during the liquid-phase hydrogenation of cyclohexene using a novel Pd–Al catalyst supported on biomorphic carbon.The catalysts have been prepared by a reactive method, using cellulose as carbonaceous precursor of the biomorphic support. The influence of the time and decomposition temperature (600–800 °C) of cellulose under hydrogen atmosphere has been studied. The characterization results indicate that the synthesis of these biomorphic materials produce solids with high microporosity. The metallic dispersion of the Pd nanoparticles is strongly dependent on the preparation conditions (i.e. heating rate, thermal decomposition temperature and time) of the carbonaceous precursor.The kinetic study has covered the effect of the hydrogen pressure and temperature, and was carried out using a real-time in situ Raman probe. The developed kinetic model considers the non-competitive adsorption between hydrogen and cyclohexene in two different types of Pd metallic sites. The model explains all the experimental results obtained, providing a rational explanation for the variation of the kinetic orders and apparent activation energy obtained using the empirical power-law model.

Graphical abstractEvolution along time of in situ Raman spectra and cyclohexene conversion.Figure optionsDownload full-size imageDownload high-quality image (162 K)Download as PowerPoint slide

Keywords
Biomorphic carbon; Pd–Al catalyst; Cellulose; Cyclohexene hydrogenation; In situ Raman; Kinetic study
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Kinetics of liquid phase cyclohexene hydrogenation on Pd–Al/biomorphic carbon catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 249, 1 July 2015, Pages 127–136
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