Effect of the Reduction Conditions of the Supported Palladium Precursor on the Activity of Pd/C Catalysts in Hydrogenation of Sodium 2,4,6-Trinitrobenzoate
Russian Chemical Bulletin
, E-ISSN: 1573-9171
||2,4,6trinitrobenzoic acid, catalytic hydrogenation, palladium catalyst,
Belskaya O. B.
Mironenko R. M
Gulyaeva T. I.
Trenikhin M. V
Likholobov V. A.
Institute of Hydrocarbons Processing, Siberian Branch of the Russian Academy of Sciences,
54 ul. Neftezavodskaya, 644040 Omsk, Russian Federation
Omsk State Technical University,
11 prosp. Mira, 644050 Omsk, Russian Federation
F. M. Dostoevsky Omsk State University,
55a prosp. Mira, 644077 Omsk, Russian Federation
Omsk Scientific Center, Siberian Branch of the Russian Academy of Sciences,
15 prosp. Karla Marksa, 644024 Omsk, Russian Federation
Russian Foundation for Basic Research
The study addresses the effect of the reduction conditions of palladium polynuclear
hydroxo complexes (PHC) supported on the Sibunit carbon material on the dispersion of the
metal particles and the activity of 0.5%Pd/Sibunit catalysts in the selective hydrogenation of
sodium 2,4,6trinitrobenzoate to 1,3,5triaminobenzene in an aqueous solution (temperature
of 323 or 343 K, pressure of 0.5 MPa). The palladium PHC were reduced using the most
common methods pertaining to catalyst preparation: liquidphase reduction with sodium
formate and reduction in a hydrogen flow at elevated temperature. It was found that high
temperature reduction in the gas phase gives rise to Pd particles with a markedly lower
dispersion compared with the sample obtained under mild liquidphase reduction conditions.
The catalytic activity of the sample containing large Pd particles proved to be higher than the
activity of the catalyst obtained by reduction with sodium formate.