Reaction Pathways and the Role of Solvent in the Hydrogenation of Chloronitrobenzenes

2003 ◽  
Vol 68 (10) ◽  
pp. 1819-1832 ◽  
Author(s):  
Vieroslav Krátky ◽  
Milan Králik ◽  
Alexander Kaszonyi ◽  
Magdaléna Stolcová ◽  
Lubomír Zalibera ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Benzene Ring ◽  
Catalyst Activity ◽  
Reaction Pathways ◽  
Reaction Conditions ◽  
Liquid Phase Hydrogenation ◽  
Role Of Solvent ◽  
Hplc Analyses ◽  
C Nmr

Liquid phase hydrogenation of chloronitrobenzenes to corresponding chloroanilines over Pd on carbon (Pd/C) under mild reaction conditions was studied. On the basis of 1H, 13C NMR, GC-MS and HPLC analyses of reaction mixtures, the reaction pathways were evaluated. The reduction of substrates proceeds via the formation of chloronitrosobenzenes and N-(chlorophenyl)hydroxylamines and mainly results in the formation of the chloroanilines and aniline. Aniline is formed by hydrogenolysis of chlorine (dechlorination) in benzene ring. Other compounds (mono- and disubstituted azobenzenes and azoxybenzenes) were also detected by GS-MS and HPLC (<3 mole %). The used solvent influences the reaction mixture composition and catalyst activity.

Insights into the Stability of Pd/CN Catalyst in Liquid Phase Hydrogenation of Phenol to Cyclohexanone: Role of Solvent

2019 ◽  
Vol 149 (11) ◽  
pp. 3087-3096 ◽  
Author(s):  
Xiang Zhang ◽  
Yan Du ◽  
Hong Jiang ◽  
Yefei Liu ◽  
Rizhi Chen
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Hydrogenation ◽  
The Stability ◽  
Role Of Solvent

scholarly journals Liquid phase hydrogenation of CO2 to formate using palladium and ruthenium nanoparticles supported on molybdenum carbide

2019 ◽  
Vol 43 (35) ◽  
pp. 13985-13997 ◽  
Author(s):  
Claire E. Mitchell ◽  
Umberto Terranova ◽  
Ihfaf Alshibane ◽  
David J. Morgan ◽  
Thomas E. Davies ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Palladium Nanoparticles ◽  
Molybdenum Carbide ◽  
Active Catalyst ◽  
Ruthenium Nanoparticles ◽  
Reaction Conditions ◽  
Hydrogenation Of Co2 ◽  
Liquid Phase Hydrogenation ◽  
Hydrogenation Of Co

We report the development of palladium nanoparticles supported on Mo2C as an active catalyst for the liquid-phase hydrogenation of CO2 to formate under mild reaction conditions (100 °C and 2.0 MPa of a 1 : 1 CO2 : H2 mixture).

scholarly journals Selective Liquid Phase Hydrogenation of Benzaldehyde to Benzyl Alcohol Over Alumina Supported Gold

2019 ◽  
Vol 150 (3) ◽  
pp. 881-887
Author(s):  
Yufen Hao ◽  
Chiara Pischetola ◽  
Fernando Cárdenas-Lizana ◽  
Mark A. Keane
Keyword(s):  
Liquid Phase ◽  
Benzyl Alcohol ◽  
Reaction Conditions ◽  
Liquid Phase Hydrogenation ◽  
Alcohol Water ◽  
Reaction Constant ◽  
Supported Gold ◽  
First Time ◽  
Nucleophilic Mechanism ◽  
By Products

Abstract We report for the first time 100% benzyl alcohol yield from the liquid phase (T = 353 K, P = 9 bar) hydrogenation of benzaldehyde over Au/Al2O3. Under the same reaction conditions, a benchmark Pt/Al2O3 catalyst promoted the formation of toluene and benzene as hydrogenolysis by-products. Reaction kinetics was subjected to a Hammett treatment and the reaction constant (ρ = 0.9) was found to be consistent with a nucleophilic mechanism. A solvent (alcohol, water and alcohol + water) effect is demonstrated and ascribed to competitive adsorption where solvation by polar (water) facilitates benzaldehyde activation. Graphic Abstract

The key role of solvent in condensation: mapping water in liquid-liquid phase-separated FUS

2021 ◽  
Author(s):  
Jonas Ahlers ◽  
Ellen M. Adams ◽  
Verian Bader ◽  
Simone Pezzotti ◽  
Konstanze F. Winklhofer ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Role Of Solvent

Liquid phase hydrogenation of furfural to biofuel over robust NiCu/Laponite catalyst: A study on the role of copper loading

2021 ◽  
Author(s):  
S. Umasankar ◽  
P. Santhana Krishnan ◽  
G. Sonia Theres ◽  
P. Tamizhdurai ◽  
K. Shanthi
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Hydrogenation
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