Deactivation of Supported Nickel-Based Hydrogenation Catalysts with Sulfide Ions
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Kinetics of the liquid-phase hydrogenation of a multiple carbon bond is studied in an aqueous medium on supported nickel catalysts at different hydrogen pressures in the system under conditions of partly controlled deactivation of the active surface sites with sulfide ions. The pattern of deactivation of the active surface sites of Ni/SiO2 catalysts containing different amounts of the active metal on the surface with sulfide ions in water is determined. The resistance of the studied catalysts to deactivation during the reduction of diethyl maleate (DM) and propen-2-ol-1 is determined experimentally. It is shown that the catalyst is more resistant to deactivation during the hydrogenation of propen-2-ol-1; this finding is attributed to the steric factor. It is found that the hydrogen pressure in the system does not affect the deactivation pattern. Excessive pressure slightly alters the deactivation resistance of the catalyst during the hydrogenation of propen-2-ol-1. It is shown experimentally that the catalytic properties of nickel in liquid-phase hydrogenation reactions can be controlled by introducing small amounts of a catalytic poison into the system at high hydrogen pressures.
Keywords:liquid-phase hydrogenation adsorption complex catalyst activity catalytic poison
This work was performed on equipment at the shared resource center of the Ivanovo State University of Chemistry and Technology and the Lobachevsky State University of Nizhny Novgorod. The theoretical part was coordinated with plan no. 19-03-460-07 of the activities of the Scientific Council of the Russian Academy of Sciences for physical chemistry in 2019.
This work was performed as the project part of State Task no. 3.1371.2017/4.6.
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