1998-02-23

Development of Single Coated Pd/Rh Three Way Catalyst for CCC Application 980666

We developed new single coated Pd/Rh three-way catalysts (TWC). Several Pd/Rh single layered catalysts were prepared by changing the precious metal (PM) fixation method and adding new base metal oxides (BMO). These samples were compared with double-coated catalyst by using model gas activity test, BET test, XRD test and vehicle emission test. It is found that the performance of the single coated catalyst is as good as that of commercialized double-coated catalyst. The oxygen storage capacity of the single coated catalyst is better than that of double-coated catalyst. Moreover, manufacturing the single coated catalyst enables us to eliminate the unnecessary coating process which is essential to the conventional one. Our test results demonstrate that the developed catalyst has sufficient activity and durability of OSC to meet emission and OBD-II regulations.

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