PACKET OF GAS-PERMEABLE NOBLE-METAL GRIDS FOR CATALYTIC PROCESSES Russian patent published in 2000 - IPC

FIELD: noble metal catalysts. SUBSTANCE: packet largely designed for catalytic oxidation of ammonia and for recovering platinoids vaporizing during this process comprises tied-wire grids of platinum or palladium- based alloy and is distinguished by that grids are tied from single-thread or twin wire to form stockinette structure with repeats of 2 or 3 or 4 needles, whereas (i) platinum-based alloy contains, wt.%: rhodium, 3-11 or palladium, 3-16; and rhodium, 3-11 or palladium, 3-16; rhodium, 3-11 and ruthenium 0.1-1,0; or (ii) palladium-based alloy contains, wt.%: tungsten (yttrium) 3-10; or copper, 3-10; or nickel, 3-10. Grids in the packet are oriented at angle 90 deg. to each other. EFFECT: enhanced ammonia conversion efficiency. 5 cl, 2 tbl, 2 ex