FIELD: chemistry.
SUBSTANCE: invention relates to a method of regenerating a catalyst layer and a method of producing acrolein and/or acrylic acid via heterogeneously catalysed partial gas-phase oxidation of propylene. The method of regenerating a catalyst layer which is deactivated during heterogeneously catalysed partial dehydrogenation of a hydrocarbon involves passing a regenerating gas through a layer of deactivated catalyst for a period of time t, said gas being at high temperature and containing molecular oxygen and an inert gas but not containing a hydrocarbon, under the condition that during the regeneration process total content GA of carbon oxides in the regenerating gas passed through the catalyst layer at the outlet of the catalyst layer within a period of time t at least periodically exceeds total content GE of carbon oxides in the regenerating gas passed through the catalyst layer at the inlet of the catalyst layer, wherein the corresponding content values are expressed as a percentage of the volume (vol. %) of the regenerating gas and wherein the difference ΔG=GA-GE before the end of the regeneration process passes through a maximum ΔGmax, where: a) 0.2 vol. % ≤ ΔGmax≤ to 5 vol. %, and b) content of molecular oxygen in the regenerating gas to be passed through the catalyst layer expressed in vol. % of the regenerating gas, for a period of time t before the end of the regeneration process, is increased at least thrice, wherein the increase in content of molecular oxygen each time is at least 2 vol. %. In the method of producing acrolein and/or acrylic acid, the catalyst layer is regenerated using the disclosed regeneration method from time to time.
EFFECT: susceptibility of the regenerated catalyst layer to deactivation is not different from susceptibility of a freshly loaded catalyst to deactivation.
22 cl, 3 tbl, 4 dwg, 3 ex
