Abstract
Siderite, rich in the transition elements, is an idea material to prepare the catalysts for the selective catalytic reduction (SCR) of NOx by NH3. In this work, siderite was doped with Mn and Ce and the performance of Mn-Ce co-doped siderite catalysts in the removal of NOx (de-NOx) by SCR with NH3 was then investigated. The results illustrate that FeCO3 as the main component of siderite can be converted into Fe2O3 by calcination at 450°C. The doping of siderite with Mn and Ce can enhance the surface area and acidity of siderite and reduce the thermal stability of ammonium sulfate formed on the catalyst surface. As a result, the Mn-Ce co-doped siderite catalysts exhibit high efficiency in the de-NOx by SCR and high resistance against sulfur. Over the 3%Mn1%Ce-siderite catalyst, high NOx conversion (>90%) is achieved in the temperature window of 180–300°C; moreover, the NOx conversion remains above 75% even after introducing SO2 for 7.5 h.
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