CrOx-MnOx-TiO2 adsorbent with high resistance to SO2 poisoning for Hg0 removal at low temperature

Abstract Chromium modified MnO x –TiO 2 (CMT), MnO x –TiO 2 (MT) and CrO x –TiO 2 (CT) adsorbents were prepared by a sol–gel method and were investigated for Hg 0 removal in the absence and presence of SO 2 . The fresh and used adsorbents were characterized by N 2 physisorption, XRD, FTIR, H 2 -TPR, XPS and TG. The results showed that the addition of Cr into MT can not only increase the activity of Hg 0 removal, but also improve its SO 2 resistance performance. The amount of manganese sulfate formed onto spent CMT was much higher than that of chromium sulfate, meaning that sulfate species were formed preferentially on Mn rather than Cr.