Abstract
Catalyst deactivation and hysteresis behavior in industrial SO 2-oxidation catalysts have been studied in the temperature region 350–480°C by combined in situ EPR spectroscopy and catalytic activity measurements. The feed gas compositions simulated sulfuric acid synthesis gas and wet/dry deNO x 'ed flue gas. The vanadium (IV) compound K 4(VO) 3(SO 4) 5 precipitated during all the investigated conditions hence causing catalyst deactivation. Hysteresis behavior of both the catalytic activity and the V(IV) content was observed during reheating.
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