抄録
The SCR De-NOx commercial system for coal fired boiler exhaust has almost 22 years history. The Catalyst poisoning by Arsenic oxide vapor was found first in an European SCR test plant. Arsenic in coal is vaporized as its oxides and almost all of them are adsorbed on the ash surface but a very small of the remainder makes the serious catalyst retardation. According to the progress of SCR technologies, catalyst retardation kinetics is required for the catalyst life estimation in coal fired SCR even for the high amount of Arsenic containing region. We studied the Arsenic poisoning kinetics in laboratory scale tests and found the good accordance with the actual exhaust data. The obtained Arsenic deposition (L) and the activity deterioration (k_0/k_<obs>) are expressed as follows.
