scholarly journals KINETICS OF HYDROGENATION OF NITROBENZENE, 4-NITROTOLUENE, 4-NITROANILINE AND 2-CHLORO-4-NITROANILINE ON SUPPORTED PALLADIUM CATALYST

2018 ◽  
Vol 59 (4) ◽  
pp. 68
Author(s):  
Alexander A. Krasnov ◽  
Adele R. Latypova ◽  
Olga V. Lefedova ◽  
Nikolaiy Yu. Sharonov ◽  
Evgeniy V. Efremov ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Aqueous Solutions ◽  
Nitro Compound ◽  
Palladium Catalyst ◽  
Reaction Rate ◽  
Supported Palladium Catalyst ◽  
Liquid Phase Hydrogenation ◽  
Donor Acceptor ◽  
Supported Palladium ◽  
Kinetics Of

A study of the kinetics of liquid phase hydrogenation of nitrobenzene, 4-nitrotoluene, 4-nitroaniline and 2-chloro-4-nitroaniline on supported palladium catalyst in aqueous solutions of 2-propanol of different composition was carried out. The influence of the substituent on the value of the total amount of hydrogen absorbed during the reaction and the kinetics of the hydrogenation of substituted nitrobenzenes was discussed. It was found out that the reaction selectivity to 2-chloro-1,4-phenylenediamine decreases due to by-reaction dehalogenation. The degree of dehalogenation depends on the composition of solvent and may be approximately estimated by the values of the absorbed hydrogen volume during the reaction. Also, the presence of the donor-acceptor substituents is capable of exerting influence on the reaction rate of hydrogenation of the nitro compound.

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.

Carbon nanofiber supported palladium catalyst for liquid-phase reactions

2001 ◽  
Vol 170 (1-2) ◽  
pp. 155-163 ◽  
Author(s):  
Cuong Pham-Huu ◽  
Nicolas Keller ◽  
Gabrielle Ehret ◽  
Loı̈c J Charbonniere ◽  
Raymond Ziessel ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Palladium Catalyst ◽  
Carbon Nanofiber ◽  
Supported Palladium Catalyst ◽  
Supported Palladium
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