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Issue
Korean Journal of Chemical Engineering,
Vol.20, No.2, 222-229, 2003
Tackling the Problem of Sulfur Poisoning of Perovskite Catalysts for Natural Gas Combustion
Rosso I, Saracco G, Specchia V
LaMn0.5Mg0.5O3ㆍy MgO and LaCr0.5-xMnxMg0.5O3ㆍy MgO catalysts (x=0-0.25, y=0-17) were prepared, characterized (XRD, BET, SEM-EDS, TEM, FTIR, chemical and atomic absorption analyses), tested for high-temperature methane combustion and aged in presence of SO2 to investigate sulfur effect on catalytic activity. Different roles of manganese and chromium in the perovskite structure have been assessed: (i) manganese improves the activity of catalysts in the fresh state, whereas chromium worsens it; (ii) owing to its basic nature, manganese makes perovskites more prone to adsorb SO2 and so less resistant to sulfur poisoning, whereas chromium, owing to its acidic nature, has opposite effects; (iii) the partial solubility of chromium oxide in basic media renders Cr-catalyst regeneration by NH3 leaching less effective. MgO promotes catalytic activity of fresh LaCr0.5Mg0.5O3ㆍy MgO catalysts and slows down sulfur poisoning of LaMn0.5Mg0.5O3ㆍy MgO and LaCr0.25Mn0.25Mg0.5O3ㆍ17 MgO catalysts only.
Keywords: LaMn0.5Mg0.5O3ㆍy MgO; LaCr0.5-xMnxMg0.5O3ㆍy MgO; Perovskite; Methane Catalytic Combustion; Sulfur Poisoning
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[Cited By]
  1. Hunsom M, Dunyushkina L, Adler S, Korean Journal of Chemical Engineering, 23(5), 720, 2006
  2. Yang X, Park DW, Kim MI, Korean Journal of Chemical Engineering, 24(4), 592, 2007
  3. Lee SJ, Lee SC, Jung SY, Ryu CK, Kim JC, Korean Journal of Chemical Engineering, 26(5), 1286, 2009
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