Influence of catalyst preparation on the contribution of homogeneous and heterogeneous steps to the selectivity in nitroaliphatic compounds hydrogenation

Authors: V. Dubois, G. Jannes

Abstract:
2-Methyl-2-nitropropane hydrogenation proceeds along a rake scheme that may encompass homogeneous steps, reactions on the support and on the metallic phase as well. This complexity makes it useful as a test reaction. Reaction rates, selectivities and intermediate compounds accumulation provide experimental information on the modification of catalytic parameters such as supportfunctionality and metallic dispersion. Experiments were carried outin homogeneous phase, on bare carbon supports, with mechanical mixtures of bare carbon supports and carbon-supported catalysts, and with catalysts prepared on modified supports. We have shown that hydrogen activation takes place on the metal and that organic reactants and intermediates may be activated on the metal and on the carbon support as well and may react with hydrogen available after spillover and jumpover migrations.

Keywords:
Hydrogenation
Palladium
Reaction place
Nitro
Carbon support

Published in: Applied catalysis A: General   (Volume 468, Pages 1-474, 5 November 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Influence of catalyst preparation on the contribution of homogeneous and heterogeneous steps to the selectivity in nitroaliphatic compounds hydrogenation

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