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(a) Effect of SOx exposure and subsequent thermal deSOx. Adapted with permission from ref. [56]. (b) Proposed formation of sulphates during adsorption of SO2 on [Cu(OH)]+-Al and Cu2+-2Al sites. Adapted with permission from ref. [61]. (c) NH3-SCR performance of fresh Cu-SSZ-13 (FR-Cu-SSZ-13), hydrothermally aged Cu-SSZ-13 (HA-Cu-SSZ-13) and sulphur-aged Cu-SSZ-13 (SA-Cu-SSZ-13) at high temperatures (750°C). Adapted with permission from ref. [64].
