Removal of Gas-Phase Element Mercury by Activated Carbon Fiber Impregnated with CeO2

The Hg-0 removal ability of activated carbon fiber (ACF) impregnated with cerium dioxide (CeO2/ACF) was tested in experimental gas. Some physicochemical techniques, such as Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy, were used to characterize the samples. The effects of loading values, calcination temperatures, reaction temperatures, and acid gases, such as NO and SO2, on the Hg-0 removal rates were investigated. The experimental results showed that impregnation with CeO2 significantly enhanced the Hg-0 removal ability of ACF, particularly with the loading value of 6%. The samples at different calcination temperatures had a similar Hg-0 removal performance. When the temperature was below 150 degrees C, the CeO2/ACF removal ability for Hg-0 was enhanced with the increase of the temperature and then decreased after 150 degrees C. NO and SO2 of the exprimental gas were found to have a promoted effect on Hg-0 oxidation.