Abstract
Sulphur poisoning and regeneration of a commercial NSR catalyst by SO 2 were investigated in dependence on temperature and λ value. The amount of desorbed sulphur compounds during lean-rich regeneration cycles was found to increase with decreasing λ value (0.99–0.94) at constant temperature and with increasing temperature (660–720 °C) at constant λ value. At a regeneration temperature of 660 °C, removed sulphur components comprises mainly SO 2 at λ values near 1, whereas H 2S and COS are released at lower λ values. At higher regeneration temperatures and low λ values more SO 2 is released, but COS and H 2S formation also increases.
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