We can refurbish some here in my facility if they are bad especially OXI and Ammonia slip ones for a fraction of the replacement cost!
The catalysts we have designed and patented should last 7 years and are withstanding overtemperature above 550C and can be refurbished at least 2x > big advantage and super easy exchange (like2h per layer max) much lower purchasing price on SCR/OXI/ROM catalysts as the ones you have. Hope this helps. Any questions, please let me know. Sebastian @ Service 3000