| 摘要 |
1491445 Catalytic element for I.C. exhaust conversion UNITED KINGDOM ATOMIC ENERGY AUTHORITY 25 Oct 1974 [8 Nov 1973] 51977/73 Heading B1F [Also in Division B3] A catalyst body having channels extending therethrough comprises a single corrugated strip of an oxidised aluminium bearing ferritic steel coated with a catalyst which is folded about one or more axes lying at an angle to the crests 3 of the corrugations to form layers, the corrugation crests 3 of each of which are at an angle Ï to those of an adjacent layer or layers. In one embodiment a strip 1 is formed by rolls 2 with corrugations inclined at an angle Ï to the length of the strip. The corrugated strip is folded in a zig-zag manner or, as shown, about a transverse region 7. which is flattened to facilitate folding, to form two layers the crests 3 of the corrugations of which lie at an angle Ï to each other. The double layer formed may be folded in a zig-zag manner or wound into a coil (Fig. 5, not shown). The corrugated strip may alternatively be folded about one or more axes extending along its length, the region to be folded (19) (Fig. 6, not shown) being left uncorrugated and provided with a line of weakness such as holes (20). The strip may be perforated and may be coated with platinum, palladium, irridium or rhodium metal or alloy catalyst. The body is used for purifying exhaust gases of an internal combustion engine. |
