Development of Paper Exhaust Catalyst Material for Emission Control in Small Internal Combustion Engines (2)

We investigated the catalytic performance of a porous-structured paper coated with precious metals such as palladium(Pd) and others. A honeycomb-shaped paper catalyst was successfully produced by paper making techniques, which are often used in the friction material manufacturing process for clutch system and the following newly-developed molding process. As a new catalyst on the paper, Pd supported on Mn-substituted lanthanum hexa-aluminate (LaMnAl11O19, magnetoplumbite, MPB) crystallites with appropriate surface area was prepared and the catalytic performance, such as exhaust purification ability, was assessed using a model gas containing HC(hydrocarbon), CO(carbon monoxide) and NO(nitrogen oxide) gas. The results showed that Pd/MPB did not deteriorate even after 180h aging at 1000°C. We concluded that the MPB has good potential as a catalyst component material for internal combustion engines because of the high thermal stability. As the coated paper canned in a stainless tube is so light-weighted that it would be suitable for a catalytic converter for small engines and general purpose engines including agricultural and garden equipment, and particularly hand tools.