CATALYST, CATALYST SUPPORT, METHOD OF PREPARATION THEREOF (VERSIONS), AND METHOD FOR REMOVING NITROGEN OXIDES FROM EMISSION GASES Russian patent published in 2003 - IPC

FIELD: gas treatment catalysts. SUBSTANCE: invention relates to removal of nitrogen oxides from both dry and wet sulfur-containing gases with the aid of C12-C16-hydrocarbons under oxidation conditions. Catalyst involved in this process represents composition depicted as n Me₁ m Me₂O p SO_x/support, wherein Me₁ denotes precious metal, Me₂O transition metal oxide, SO_x adsorbed sulfur oxide, n does not exceed 3.0, m does not exceed 6.0, p does not exceed 2.0 (on conversion to sulfur), and support is columnar clay including columns of nanoparticles based on (i) zirconium oxide, in amount 15-30 wt.%, depicted by formula x Me₃O/ZrO₂, wherein Me₃O denotes oxide of aluminum, iron, cerium, copper, or their mixture and x = 0 to 4.0, or (ii) alumina, in amount 15-20 wt.%, having interlayer distance no larger than 10A, total volume of meso- and micropores no larger than 0.25 cu.cm/g, and specific surface 200-370 sq.m/g. Catalyst is prepared by ion exchange, photodeposition, or impregnation. Emission gases are cleaned using above-described catalyst in oxidative atmosphere at 180 to 560 C via catalytic reduction with hydrocarbons. EFFECT: increased degree of removal of nitrogen oxides. 20 cl, 3 dwg, 4 tbl, 29 ex