Abstract
SO 2 inhibits important three-way or stoichiometric catalytic reactions. Of the noble metals studied (Pt, Pd, Rh, Ir), Rh is particularly resistant to SO 2 for NO removal while Pt is strongly inhibited by SO 2. This is an important reason why Rh is useful for effective NO control. Ir is particularly effective for converting NO under strongly oxidizing conditions in the presence of SO 2. NH 3 formation is inhibited by SO 2 over the metals studied. Similarly under reducing conditions, propylene conversion is inhibited by SO 2 over the metals studied.
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