Search Results

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 180 h 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.

We have investigated the catalytic performance of a porous-structured paper containing noble metal catalysts such as platinum (Pt) and rhodium (Rh) supported on a thermally stabilized alumina (Al2O3). The catalysts were prepared by the usual impregnation method first, and then introduced into the macro porous-structured paper as catalytic active sites during the papermaking process. When the resultant paper was calcined at 1000°C for 60 h, it showed similar catalytic performance compared with the original powder-like catalyst. Particularly, the paper containing freshly prepared catalyst showed superior performance than a paper containing a commercially available alumina as support material. A small sized honeycomb-like structure was successfully prepared by using the catalyst paper, and this clearly indicates that the paper is a promising catalytic material for controlling exhaust emissions from small engines.