Liquid phase hydrogenation, isomerization and dehydrogenation of limonene and derivatives with supported palladium catalysts

1999 ◽  
Vol 148 (1-2) ◽  
pp. 203-214 ◽  
Author(s):  
Ricardo J. Grau ◽  
Patricia D. Zgolicz ◽  
Carolina Gutierrez ◽  
Hugo A. Taher
Keyword(s):  
Liquid Phase ◽  
Palladium Catalysts ◽  
Supported Palladium Catalysts ◽  
Liquid Phase Hydrogenation ◽  
Supported Palladium

scholarly journals Liquid-phase Hydrogenation of Phenol to Cyclohexanone over Supported Palladium Catalysts

2016 ◽  
Vol 11 (3) ◽  
pp. 354 ◽  
Author(s):  
Lihui Fan ◽  
Luyang Zhang ◽  
Yanming Shen ◽  
Dongbin Liu ◽  
Nasarul Wahab ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Palladium Catalysts ◽  
Pd Nanoparticles ◽  
Moderate Amount ◽  
Supported Palladium Catalysts ◽  
Phenol Hydrogenation ◽  
Liquid Phase Hydrogenation ◽  
Supported Palladium ◽  
Phenol Conversion ◽  
Supported Pd

<p>The ZSM-5, g-Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub> and MgO supported Pd-catalysts were prepared for the phenol hydrogenation to cyclohexanone in liquid-phase. The natures of these catalysts were characterized by XRD, N<sub>2</sub> adsorption-desorption analysis, H<sub>2</sub>-TPR, CO<sub>2</sub>-TPD and NH<sub>3</sub>-TPD. The catalytic performance of the supported Pd-catalyst for phenol hydrogenation to cyclohexanone is closely related to nature of the support and the size of Pd nanoparticles. The Pd/MgO catalyst which possesses higher basicity shows higher cyclohexanone selectivity, but lower phenol conversion owing to the lower specific surface area. The Pd/SiO<sub>2</sub> catalyst prepared by precipitation gives higher cyclohexanone selectivity and phenol conversion, due to the moderate amount of Lewis acidic sites, and the smaller size and higher dispersion of Pd nanoparticles on the surface. Under the reaction temperature of 135 <sup>o</sup>C and H<sub>2</sub> pressure of 1 MPa, after reacting for 3.5 h, the phenol conversion of 71.62% and the cyclohexanone selectivity of 90.77% can be obtained over 0.5 wt% Pd/SiO<sub>2</sub> catalyst. Copyright © 2016 BCREC GROUP. All rights reserved</p><p><em>Received: 7<sup>th</sup> March 2016; Revised: 13<sup>rd</sup> May 2016; Accepted: 7<sup>th</sup> June 2016</em></p><p><strong>How to Cite:</strong> Fan, L., Zhang, L., Shen, Y., Liu, D., Wahab, N., Hasan, M.M. (2016). Liquid-phase Hydrogenation of Phenol to Cyclohexanone over Supported Palladium Catalysts. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 11 (3): 354-362 (doi: 10.9767/bcrec.11.3.575.354-362)</p><p><strong>Permalink/DOI</strong>: <a href="http://doi.org/10.9767/bcrec.11.3.575.354-362">http://doi.org/10.9767/bcrec.11.3.575.354-362</a></p>

scholarly journals SUPPORTED PALLADIUM CATALYSTS FOR SELECTIVE LIQUID-PHASE HYDROGENATION OF AROMATIC NITRO COMPOUNDS

2021 ◽  
Vol 14 (03) ◽  
pp. 1795-1802
Author(s):  
L.R. Sassykova ◽  
A.R. Sassykova ◽  
B.T. Dossumova ◽  
M. S. Ilmuratova ◽  
N. E. Maximov ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Palladium Catalysts ◽  
Nitro Compounds ◽  
Supported Palladium Catalysts ◽  
Aromatic Nitro Compounds ◽  
Liquid Phase Hydrogenation ◽  
Supported Palladium ◽  
Aromatic Nitro

Effect of internal diffusion on kinetics of liquid phase hydrogenation and disproportionation of the cyclohexene on palladium catalysts

1989 ◽  
Vol 54 (11) ◽  
pp. 3003-3010 ◽  
Author(s):  
Jiří Hanika ◽  
Vladimíra Ehlová
Keyword(s):  
Liquid Phase ◽  
Palladium Catalysts ◽  
Internal Diffusion ◽  
Side Reactions ◽  
Commercial Catalyst ◽  
Liquid Phase Hydrogenation ◽  
Effectiveness Factors ◽  
Supported Palladium ◽  
Kinetics Of ◽  
Diffusion Of Hydrogen

Kinetics of the side reactions represented by the system involving hydrogenation and disproportionation of cyclohexene on a commercial catalyst CHEROX 41-00 (3%Pd/C) and on a supported palladium catalyst prepared by impregnation of aluminia with aqueous palladium dichloride (2.15% Pd/γ-Al2O3) have been investigated. As follows from the effectiveness factors of internal diffusion for individual reactions, in the region of internal diffusion, cyclohexene hydrogenation is preferred compared to disproportionation. This finding can be related to the fact that while the rate of disproportionation is controlled by cyclohexene diffusion, the rate of hydrogenation is controlled by diffusion of hydrogen.

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