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Synthesis of hydroxylamine sulfate via NO hydrogenation on Pt/graphite catalysts: II. Influence of the reaction conditions and physicochemical state of the catalyst on the product yields

The dependence of the selectivity to products of the commercial process for NO hydrogenation in the H2SO4solution on process parameters such as the flow rate of the NO + H2mixture through the reactor, stirring intensity, concentration of the Pt/graphite catalyst in the suspension and temperature was studied. In the process in the mode of external diffusion of the reactant gases, the first or zero order was observed with respect to the catalyst depending on the catalyst concentration in the suspension, the selectivity to the solid products – hydroxylamine sulfates (HAS) and ammonium – being maximal in the transition range. It was shown that the selectivity to HAS increased upon functionalization of the graphite surface with nitrogen-containing groups that led to modifying the adsorbing and catalytic properties of the supported platinum nanoparticles. Specific behavior of platinum catalysts in concentrated suspensions at the limited feeding reactant gases was discussed.