The aim of this work was to reveal the sequence of the reduction of nitrobenzene (NB) and azoxybenzene (AB) on skeletal nickel for their combined presence in aqueous solutions of propan-2-ol of different compositions. | ISSN 0036-0244 Russian Journal of Physical Chemistry A 2015 Vol. 89 No. 10 pp. 1772 1775. Pleiades Publishing Ltd. 2015. Original Russian Text . Merkin . Latypova Nguen Tkhi Tkhu Kha . Lefedova 2015 published in Zhurnal Fizicheskoi Khimii 2015 Vol. 89 No. 10 pp. 1573 1577. CHEMICAL KINETICS AND CATALYSIS Kinetics of the Hydrogenation of a Mixture of Nitrobenzene and Azoxybenzene on Skeletal Nickel in an Aqueous Solution of Propan-2-ol A. A. Merkin A. R. Latypova Nguen Tkhi Tkhu Kha and O. V. Lefedova Ivanovo State University of Chemical Technology Ivanovo 153000 Russia e-mail physchem@ Received December 18 2014 Abstract The sequence of the reduction of nitro and azoxy groups in the combined hydrogenation of nitro- benzene and azoxybenzene on skeletal nickel in an aqueous azeotropic solution of propan-2-ol is considered. The time dependences of the rates and concentrations of the initial compound and reaction product for the hydrogenation of individual compounds nitrobenzene and azoxybenzene in the solvent of the indicated composition are discussed for comparative analysis. In all cases the reactions proceed selectively to aniline without accumulating side products. The reduction of the nitro and azoxy groups involves hydrogen bound by the active sites of the catalyst surface. The competitive character of adsorption between the initial com- pounds and formed aniline is observed. Nitrobenzene is characterized by the highest adsorbability whereas azoxybenzene and aniline are less adsorbable. Keywords nitrobenzene azoxybenzene aniline hydrogen skeletal nickel aqueous solution of propan-2-ol. DOI S0036024415100222 INTRODUCTION aqueous solutions of propan-2-ol of different compo- sitions. It is known that nitrobenzene hydrogenation on skeletal nickel proceeds via a multipath scheme to form a whole series of side and intermediate com- EXPERIMENTAL pounds one of which is azoxybenzene 1 3 . For Skeletal nickel was used as the catalyst and was pre-
