The Hg 0 removal ability of γ-Al 2 O 3 impregnated with cerium dioxide (CeO 2 /γ-Al 2 O 3 ) was tested in the experimental flue gas of, and thermogravimetric (TG) analyses were used to characterize the samples. The effects of CeO 2 loading values, reaction temperatures, reaction time, and individual flue gas components, including SO 2 , NO, O 2 , and H 2 O(g), on the Hg 0 removal efficiency were investigated. The results show that the Hg 0 removal efficiency of γ-Al 2 O 3 can be greatly improved by CeO 2 and, at a test temperature of 350 °C, the best suitable loaded mass percentage of CeO 2 is 9%. In the temperature range from 150 to 350 °C, the Hg 0 removal efficiency using CeO 2 /γ-Al 2 O 3 increases with the increase of the temperature and then decreases above 350 °C, except virgin γ-Al 2 O 3 . In addition, the presence of O 2 and NO have positive effects on the Hg 0 removal efficiency, while the presence of SO 2 and H 2 O inhibited it. Furthermore, prolonging the reaction time had a small negative effect on the Hg 0 removal performance, indicating that the catalyst of CeO 2 /γ-Al 2 O 3 possesses thermostability.

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The Hg0 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 Hg0 removal rates were investigated. The experimental results showed that impregnation with CeO2 significantly enhanced the Hg0 removal ability of ACF, particularly with the loading value of 6%. The samples at different calcination temperatures had a similar Hg0 removal performance. When the temperature was below 150 °C, the CeO2/ACF removal ability for Hg0 was enhanced with the increase of the temperature and then decreased after 150 °C. NO and SO2 of the exprimental gas were found to have a promoted effect on Hg0 oxidation.