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The wet ammonia (NH 3 ) desulfurization process can be retrofitted to remove nitric oxide (NO) and sulfur dioxide (SO 2 ) simultaneously by adding soluble cobalt(II) salt into the aqueous ammonia solution. Activated carbon is used as a catalyst to regenerate hexaminecobalt(II), Co(NH 3 ) 6 2þ , so that NO removal efficiency can be maintained at a high level for a long time. In this study, the catalytic performance of pitch-based spherical activated carbon (PBSAC) in the simultaneous removal of NO and SO 2 with this wet ammonia scrubbing process has been studied systematically.