title: Kinetics of NiO and NiCl2 hydrogen reduction as precursors and properties of produced Ni/Al2O3 and Ni-Pd/Al2O3 catalysts.
abstract: The objects of this investigation were the comparative kinetic analysis of the NiO and NiCl2 reduction by hydrogen during an induction period and elimination of the calcination during the synthesis of Ni/Al2O3 catalysts. The effect of temperature and time on NiO and NiCl2 reduction degrees was studied. Avrami I equation was selected as the most favorable kinetic model and used to determine activation energy of the NiO and NiCl2 reduction for the investigated temperature range (623-923 K) and time intervals (1-5 minutes). The investigation enabled reaching conclusions about the reaction ability and rate of the reduction processes. Afterward, Ni/Al2O3 catalysts were obtained by using oxide and chloride precursor for Ni. The catalysts were supported on alumina-based foam and prepared via aerosol route. Properties of the samples before and after low-temperature hydrogen reduction (633 K) were compared. Obtained results indicated that the synthesis of Ni/Al2O3 catalysts can be more efficient if chloride precursor for Ni is directly reduced by hydrogen during the synthesis process, without the calcination step. In addition, Ni-Pd/Al2O3 catalysts with different metal content were prepared by using chloride precursors. Lower reduction temperature was utilized and the chlorides were almost completely reduced at 533 K.
authors: Institute for Technology of Nuclear and Other Mineral Raw Materials, 86 Bulevar Franš d'Eperea Street, 11000 Belgrade, Serbia.
authors: Miroslav
authors: M
authors: Sokić
authors: Faculty of Technology and Metallurgy, University of Belgrade, 4 Karnegijeva Street, 11120 Belgrade, Serbia.
authors: Željko
authors: Ž
authors: Kamberović
authors: Innovation Center of the Faculty of Technology and Metallurgy, University of Belgrade, 4 Karnegijeva Street, 11120 Belgrade, Serbia.
authors: Vesna
authors: V
authors: Nikolić
authors: Institute for Technology of Nuclear and Other Mineral Raw Materials, 86 Bulevar Franš d'Eperea Street, 11000 Belgrade, Serbia.
authors: Branislav
authors: B
authors: Marković
authors: Faculty of Technology and Metallurgy, University of Belgrade, 4 Karnegijeva Street, 11120 Belgrade, Serbia.
authors: Marija
authors: M
authors: Korać
authors: Innovation Center of the Faculty of Chemistry, University of Belgrade, 12-16 Studentski Trg Street, 11000 Belgrade, Serbia.
authors: Zoran
authors: Z
authors: Anđić
authors: Innovation Center of the Faculty of Technology and Metallurgy, University of Belgrade, 4 Karnegijeva Street, 11120 Belgrade, Serbia.
authors: Milorad
authors: M
authors: Gavrilovski