The technical answer to your query is that CAT OS is not designed to run on Routers. Cisco started their journey with routers first and then eventually acquired a company called Kalpana Switches to get in to switching market.
The code they were running on routers was called Cisco IOS and the one running on switches was called CAT OS. The difference bening the switches were pure layer 2 device at that time.
Now when you have multilayer switches like 6500 switch, there are two modes - Native mode and Hybrid Mode. Native mode the switch runs CAT OS only and does not supports any layer 3 feature while in Hybrid mode it runs bith CAT OS and Cisco IOS providing additional Layer 3 features.
CAT OS is meant for layer 2 functionalities only and does not support any layer 3 feature hence you can not have CAT OS running on routers.
Comparison of the Cisco Catalyst and Cisco IOS Operating Systems for the Cisco Catalyst 6500 Series Switch -
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