Vanadium catalysts for hydrogen chloride oxidation with molecular oxygen

Regeneration of chlorine oxidation of hydrogen chloride is an important problem of organochlorine products production. Known catalysts for this reaction is low-acting and mostly not stable enough. The information about the application of V-catalysts for this process are practically absent. This is study of stability and catalytic activity of industrial sulfuric acid vanadium sulfate catalysts IК-1-6 in the oxidation of hydrogen chloride with molecular oxygen. It is found that activity of the catalyst reaches 660 g·kg /(Cat·h) at 400 °C, and the rate of mass loss of the catalyst (due to the formation of volatile vanadyl chloride) is 4,6 %/h on a vanadium in conditions of low conversion (less than 15%) in the external diffusion area. In conditions of high conversions (60%), vanadyl chloride, which is formed on the main layer of the catalyst, is hydrolyzed and precipitated on the subsequent layers on the conversion growth of the reaction mixture, leads to a redistribution of vanadium on the height of the catalyst layer and prevents its removal from a reactor. Periodic change of the reacting gas direction in a catalytic reactor or using of batteries of several series-connected reactors, which are periodically swapped from the input to the output stream ensures stable operation of the catalyst. The results show that industrial vanadium-sulfate catalysts for sulfur dioxide oxidation exceed in activity and stability of all the known catalysts for Deacon process (except for ruthenium), and can be used for catalytic oxidation of hydrogen chloride.

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