SHELL OF HOLLOW CYLINDRICAL CATALYST CARRIER SUBSTRATE AND CATALYTICALLY ACTIVE OXIDE MASS APPLIED ON OUTER SURFACE THEREOF

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to a method of increasing selectivity when producing acrylic acid with using shell-type catalyst for partial gas-phase oxidation of acrolein to acrylic acid, consisting of a hollow cylindrical bearing substrate with length from 2 to 10 mm, external diameter of 4 to 10 mm and wall thickness from 1 to 4 mm, as well as applied on outer surface of carrying wafer shell of catalytically active oxide mass of general formula (I): ; ;in which X¹ denotes one or more elements from a group of alkali and alkali-earth metals, X² denotes one or more elements from a group of silicon, aluminium, titanium and zirconium, and n is a stoichiometric factor of oxygen element, which is determined by stoichiometric coefficients different from oxygen elements, as well as their charge number in formula (I).;EFFECT: high selectivity.;10 cl, 2 dwg, 3 tbl, 12 ex