A study on the reduction of compounds containing nitrogen-oxygen bond on skeletal nickel in aqueous solutions of 2-propanol. <...> При введении в водный раствор 2-пропанола добавок кислоты или основания скорости восстановления нитро-, нитрозо- и азоксибензола изменяются в различной степени. <...> Ключевые слова: нитробензол, нитрозобензол, азоксибензол, анилин, водород, скелетный никель, восстановление, адсорбция, скорость гидрогенизации, водные растворы 2-пропанола, уксусная кислота, гидроксид натрия Izv. <...> N 11 UDC 547.22:66.094.17 Nguyen Thi Thu Ha Nguyen Thi Thu Ha () Department of Theoretical and Physical Chemistry, Faculty of Chemistry, Hanoi National University of Education, 136 Xuan Thuy st., Cau Giay Dist., Ha Noi, Viet Nam e-mail: ntt.ha@hnue.edu.vn () A STUDY ON THE REDUCTION OF COMPOUNDS CONTAINING NITROGEN-OXYGEN BOND ON SKELETAL NICKEL IN AQUEOUS SOLUTIONS OF 2-PROPANOL It was experimentally established that the amounts of hydrogen absorbed from gaseous phase at the hydrogenation of nitrobenzene and nitrosobenzene on skeletal nickel in aqueous 2propanol do not correspond to the stoichiometry of the reaction. <...> Acetic acid or sodium hydroxide additions into the aqueous solutions of 2-propanol act differently on the rate of the nitro-, nitroso- and azoxybenzene hydrogenation. <...> During the reaction the reversible or irreversible oxidation of the catalyst surface can take place. <...> The adsorption of aniline does not take place on oxidized catalyst surface. <...> Key words: nitrobenzene, nitrosobenzene, azoxybenzene, aniline, skeletal nickel, adsorption, hydrogenation rate, 2-propanol aqueous solutions, acetic acid, sodium hydroxide INTRODUCTION The catalytic hydrogenation of nitrobenzene has been of both theoretical and practical interest for many years. <...> It is known that the reduction of nitro group may proceed by steps [1, 2]. <...> Sequential addition of hydrogen to nitro group leads to the formation of nitrosobenzene, aniline and phenylhydroxylamine. <...> The associative interactions on the catalyst surface between nitrobenzene and hydrogen, resulting in the formation of semi-hydrogenated form R-NOH are not excluded. <...> Under hydrogen deficient conditions R-NOH particles may combine to form azoxybenzene [3]. <...> The adsorption and reactivity properties of hydrogen, nitrobenzene, nitrosobenzene and intermediate compounds may be changed under the influence of solvents. <...> Therefore, studying of the reaction kinetics of the reduction of nitrobenzene and its hydrogenated intermediates is of interest <...>