Study on the poisoning tolerance and stability of perovskite catalysts for catalytic combustion of volatile organic compounds

摘要

La_(0.8)Cu_(0.2)MnO3 and La_(0.8)Sr_(0.2)MnO3 perovskite catalysts were prepared by the co-precipitation method. The resistance of these catalysts to sulfur poisoning was tested via catalytic combustion of toluene. The results show that the perovskite catalysts were poisoned in the presence of SO2. In the presence of dodecyl mer-captan (C_(12)H_(12)SH), La_(0.8)Sr_(0.2)MnO3 exhibits better resistance to sulfur poisoning than La_(0.8)Cu_(0.2)MnO3. It was determined that the SO2 deactivation is due to the formation of CuSO4 on the catalyst surface.