【摘 要】
：
In this study,the thermal stability of a ferric oxide catalyst for mercury oxidation was found to be considerably promoted by doping with La2O3.The catalysts doped with La2O3 main-tained a higher surface area when subjected to high-temperature calcination
【机 构】
：
School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;School of Re
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In this study,the thermal stability of a ferric oxide catalyst for mercury oxidation was found to be considerably promoted by doping with La2O3.The catalysts doped with La2O3 main-tained a higher surface area when subjected to high-temperature calcination,with lower av-erage pore size and a narrower pore size distribution.X-ray diffraction(XRD)results revealed that La2O3 doping hinders the growth of catalyst particles and crystallization of the mate-rial at high temperatures.Both NO and SO2 inhibited Hg0 oxidation over the La2O3/Fe2O3 catalyst.Fourier transform infrared(FTIR)spectra revealed that SO2 reacts with O2 over the catalysts to form several species that are inert for mercury oxidation,such as SO42-,HSO4-,or other related species;these inert species cover the catalyst surface and consequently de-crease Hg0 oxidation capacity.In addition,NO or SO2 competed with Hg0 for active sites on the La2O3/Fe2O3 catalyst and hindered the adsorption of mercury,thereby inhibiting subse-quent Hg0 oxidation.Hg0 oxidation on the La2O3/Fe2O3 catalyst mainly followed the Eley-Rideal mechanism.Moreover,the inhibition effects of NO and SO2 were at least partially reversible,and the catalytic activity was temporarily restored after eliminating NO or SO2.
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