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Cobalt Modification for Improving Potassium Resistance of Mn/Ce‐ZrO 2 in Selective Catalytic Reduction
Author(s) -
Xiaopeng Zhang,
Yuezong Cui,
Zhuofeng Li,
Xuerong Zhou,
Gaohong He
Publication year - 2016
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201500574
Subject(s) - catalysis , cobalt , potassium , selective catalytic reduction , chemistry , inorganic chemistry , x ray photoelectron spectroscopy , nox , adsorption , lewis acids and bases , dispersion (optics) , flue gas , redox , nuclear chemistry , chemical engineering , organic chemistry , combustion , physics , optics , engineering
The three catalysts Mn/Ce‐ZrO 2 , MnCo/Ce‐ZrO 2 , and Mn/Co‐Ce‐ZrO 2 were applied to remove NO in simulated flue gas. Their selective catalytic reduction (SCR) activity and potassium resistance were studied. Catalysts with Co as a modifier of the support exhibited the best SCR activity. The catalyst Mn/Co‐Ce‐ZrO 2 had a larger surface area, higher dispersion of active components, larger amount of surface acid, and better redox characteristics than the other two catalysts, leading to a better SCR activity. X‐ray photoelectron spectroscopy results proved the higher surface Mn 4+ concentration of K 0.3 Mn/Co‐Ce‐ZrO 2 . Pyridine adsorption analysis suggested that there was still a large amount of Lewis acid in Mn/Co‐Ce‐ZrO 2 even after potassium poisoning, demonstrating the higher resistance of this catalyst to potassium. Mn/Co‐Ce‐ZrO 2 with potassium addition had a relatively stable SCR activity in the presence of H 2 O and SO 2 .