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The additive effect of different transition metal oxide M' (M' = Fe 2 O 3 , MnO 2 , and WO 3) doping on V 2 O 5 /ZrO 2 –CeO 2 (V/ZrCe) catalyst with reduced vanadium for simultaneous removal of NO and Hg0 was investigated. V/ZrCe doped with Fe 2 O 3 , MnO 2 , and WO 3 and reduced vanadium were prepared by a wet-impregnation method and tested for their catalytic activity of simultaneous removal of NO and Hg0 in the temperature range of 100–400 °C. A combination of various analytical techniques including SEM, BET, XRD, H 2 -TPR and XPS were used to characterize the characteristics of catalysts. Results indicated that the introduction of M' could enhance the catalytic properties of the catalysts. V 0.01 Mn/ZrCe and V 0.01 Fe/ZrCe catalyst presented higher activities than the V 0.03 /ZrCe catalyst below 250 °C, while V 0.01 W/ZrCe catalyst exhibited a higher performance in the temperature range of 300–400 °C. The transition metal oxide M' species exist in a well dispersed state on V 0.01 /ZrCe catalysts. Doping the transition metal oxide M' on V 0.01 /ZrCe could affect the oxidation state of vanadium oxide and cerium oxide via the reaction of V4++Ce4+↔V5++Ce3+. Besides, the NO conversion was little impacted by Hg0, whereas SCR atmosphere has inhibited on Hg0 oxidation due to the strong competitive adsorption of NH 3 with Hg0. The water and sulfur resistance performance decreased in the order of V 0.01 W/ZrCe> V 0.01 Fe/ZrCe > V 0.01 Mn/ZrCe. The additive effect of different transition metal oxide M' (M' = Fe 2 O 3 , MnO 2 , and WO 3) doping V 2 O 5 /ZrO 2 –CeO 2 catalyst for simultaneous removal of NO and Hg0. Unlabelled Image • The effect of different transition metal oxide M' doping with reduced vanadium were studied • The synergistic effect between M' and ZrCe support synergistically promoted the performance • The introduction of M' lead to the active oxygen migration from ZrCe support to vanadium sites. • The interaction between NO reduction and Hg0 oxidation were explored [ABSTRACT FROM AUTHOR]

To rationally utilize agricultural wastes and expediently simultaneous control of elemental mercury (Hg 0 ) and NO, a series of CoO x -CeO 2 loaded maize straw derived biomass activated carbon (CoCe/BAC) samples were applied for simultaneous NO and Hg 0 removal. These samples’ physicochemical characteristics were characterized by BET, SEM, XRD, NH 3 -TPD, H 2 -TPR, XPS and FTIR. 15%Co 0.4 Ce 0.6 /BAC yielded prominent Hg 0 removal efficiency (96.8%) and superior NO removal efficiency (84.7%) at 230 °C. The separate or synchronous deactivation effects of 400 ppm SO 2 and 5%H 2 O were detected. The interaction between NO removal and Hg 0 removal was investigated, the results demonstrated that abundant Hg 0 exhibited very slightly inhibitory effect on NO removal, and NH 3 negatively affected Hg 0 removal, whereas NO mildly boosted Hg 0 removal in presence of O 2 . The characterization analyses indicated the excellent performance of 15%Co 0.4 Ce 0.6 /BAC could be ascribed to its better texture properties, lower crystallinity and stronger redox ability. Besides, a synergetic effect appeared between cobalt oxide and cerium oxide, resulting in generating more Ce 3+ and Co 3+ to induce more anionic defects and produce more active oxygen and oxygen vacancies. The removal mechanisms of NO and Hg 0 were systematically investigated, and NO reduction reactions were mainly assigned to the Langmuir-Hinshlwood mechanism while both adsorption and Hg 0 oxidation contributed to Hg 0 removal. Meanwhile, Hg 0 oxidation corresponded to the Mars-Masson mechanism prevailed gradually with the increase of reaction time. [ABSTRACT FROM AUTHOR]

To obtain a suitable catalyst for simultaneous removal of mercury and HCHO from waste flue gas, we prepared and investigated CoOx-CeO 2 loaded on commercial activated coke granules treated with sulfate acid by impregnation method to remove the two toxic gases. The results revealed that the removal efficiencies of Hg 0 and HCHO over Co 8 Ce 3 /ACs catalyst were 69.43% and 71.07% respectively in the presence of N 2 and 6% O 2 at 190 °C. And the presence of Hg 0 had little impact on HCHO removal, but formaldehyde had a certain effect on Hg 0 removal. In addition, the effects of individual flue gas component including O 2 , NO, SO 2 and H 2 O on Hg 0 and HCHO simultaneous removal performance over Co 8 Ce 3 /ACs catalyst were researched. The physicochemical properties of catalysts were characterized using BET, SEM, XRD, XPS, H 2 -TPR and FTIR. By analyzing these characterization results, it was found that the good removal property of the Co 8 Ce 3 /ACs catalyst was connected with good texture property, high dispersion of cobalt species and strong redox ability. Besides, the interaction between Co and Ce oxides phases could enhance the mobility of active oxygen species, which greatly improved the removal efficiencies of Hg0 and HCHO. Combined with the experiment and characterization results, end products of Hg 0 and HCHO are mainly HgO, CO 2 and H 2 O, respectively. So the mechanisms for simultaneous removal of mercury and HCHO were proposed. Of course, the Co 8 Ce 3 /ACs catalyst would be still modified to achieve the goal of practical industrial application. [ABSTRACT FROM AUTHOR]

A series of industrial desulfuration activated cokes loaded La 2 O 3 and CeO 2 (LaCe/AC) were employed for simultaneous NO and Hg 0 removal from simulated flue gas. The physicochemical characteristics of samples were characterized by BET, XRD, SEM, NH 3 -TPD, TGA and XPS. 25%LaCe/AC exhibited outstanding NO removal efficiency (91.3%) and superior Hg 0 removal efficiency (94.3%) at 180 °C. The effects of Hg 0 on SCR reaction and SCR atmosphere on Hg 0 oxidation were investigated. The results demonstrated that Hg 0 had negligible impact on NO removal efficiency while NO evidently promoted Hg 0 removal efficiency. Meanwhile, NH 3 had an adverse effect on Hg 0 removal efficiency. The slightly inhibitive effect derived from the existence of H 2 O or SO 2 was also detected. The NO removal mainly followed the Langmuir-Hinshlwood mechanism while the Hg 0 removal mechanism was attributed to the combination of physisorption and chemisorption and catalytic oxidation. Especially, the relative contributions of physisorption and chemisorption and catalytic oxidation were distinguished and calculated by designed mercury conversion and desorption tests, the results indicated chemisorption displayed the predominant role. In addition, the stability test of 27 h was carried out and eventually the sample maintained 84.5% Hg 0 removal efficiency and 89.5% NO removal efficiency, indicating its potentially large-scale industrial application at low temperatures in the foreseeable future. [ABSTRACT FROM AUTHOR]

Gas-phase elemental mercury (Hg°) removal by composite sulfurized activated carbon (CSAC) was studied under simulated flue gas conditions. The results showed that the CSAC, which was impregnated activated carbon (AC) with aqueous-phase sodium sulfide (Na2S) and followed with vapor-phase elemental sulfur (S°), had 1.5 times higher removal capacity than AC impregnated with single S°. This study further investigated the effect of individual flue gas components on the performance of CSAC. Fixed-bed experiments showed that SO2 and NO had no obvious impact on Hg° removal by CSAC, while the presence of O2 (up to 9%) increased the removal capacity up by 25%. [ABSTRACT FROM AUTHOR]

The different addition amounts of ZrO 2 on CuO-CeO 2 /TiO 2 catalyst synthesized by co-precipitation method were investigated to research the simultaneous removal of Hg 0 and NO in simulated flue gas. Results indicated that the CuCe/TiZr 0.15 catalyst exhibited the superior Hg 0 removal efficiency (72.7%) and prominent NO conversion (83.3%). Hg 0 slightly restrained the NO conversion. Except for the effect of the separate NH 3 and NO on Hg 0 removal, significances of the increased NH 3 /NO ratio on Hg 0 removal and NO conversion were detected. The lower GHSV could give rise to the significant acceleration of Hg 0 and NO removal. With the existence of SO 2 and H 2 O, the slightly prohibitive effect on Hg 0 and NO removal was displayed. BET, XRD, SEM, H 2 -TPR, XPS, FTIR analysis were applied to characterize catalysts and the results revealed the ZrO 2 modified support on CuO-CeO 2 /TiO 2 resulted in strong redox ability, great mobility of surface oxygen and growing total amount of chemisorbed oxygen and lattice oxygen, which favorably impacted on Hg 0 and NO removal. The introduction of Zr benefited great surface area, weakened crystallinity of TiO 2 and then improved the dispersion of metal oxide species. More stable Lewis acid sites to form coordinated NH 3 were generated due to ZrO 2 additive . The synergetic effect through redox equilibrium of C e 3 + + C u 2 + ↔ C e 4 + + C u + contributed to Hg 0 removal and NO conversion. In addition, the simultaneous removal of Hg 0 and NO on CuCe/TiZr 0.15 in terms of detailed mechanism was discussed. [ABSTRACT FROM AUTHOR]

To optimize simultaneous control of NO and elemental mercury (Hg 0 ) and gain more insight into the mechanisms, nano-sized TiO 2 -Al 2 O 3 -CeO 2 materials synthesized via sol-gel method were used for simultaneous removal of NO and Hg 0 from simulated flue gas. The physicochemical characteristics of catalysts were characterized by ICP-OES, BET, XRD, SEM, TEM, XPS, H 2 -TPR and FT-IR. TiAl 10 Ce 20 nanoparticle with the addition of 10 wt%Al 2 O 3 showed superior NO removal efficiency (93.41%) and Hg 0 removal efficiency (80.54%) in the presence of SCR atmosphere at 300 °C. The deactivation effects of 8% H 2 O and 400 ppm SO 2 were also reduced by Al addition. In the presence of SCR atmosphere, the capture of Hg 0 was inhibited by the existence of NH 3 , while the presence of Hg 0 had little impact on NO removal. The characterization results showed that the excellent performance of TiAl 10 Ce 20 nanoparticle might result from the stronger redox ability, lower crystallinity and better texture properties with highly dispersed Ce species, which were all attributed to Al addition. The mechanisms for simultaneous removal of NO and Hg 0 were also proposed on the basis of above results. TiAl 10 Ce 20 nanoparticle developed in this work was considered to be a promising catalyst for simultaneous removal of NO and Hg 0 . [ABSTRACT FROM AUTHOR]

A series of V/ZrCe x catalyst synthesized by a co-precipitation method was employed to investigate the simultaneous removal of NO and elemental mercury (Hg 0 ) in simulated flue gas. The catalysts were characterized using BET, SEM, XRD, H 2 –TPR, XPS, and FT–IR. V/ZrCe 0.6 with CeO 2 /ZrO 2 molar ratio of 0.6 showed excellent SCR activity (87.3%) and high Hg 0 oxidation efficiency (77.6%) in SCR atmosphere (NH 3 /NO = 1). The results indicated that the Hg 0 had little impact on NO conversion, while the coexistence of NO and O 2 would be beneficial for the Hg 0 oxidation. Hg 0 oxidation was inhibited in SCR atmosphere owing to the presence of NH 3 . The characterization results demonstrated that the superior performance of V/ZrCe 0.6 catalyst might be attributed to lower crystallinity, better texture properties, strong redox ability and high reactive nitrate together with NH 3 species. The redox equilibrium (Ce 3+ + V 5+ ↔ Ce 4+ + V 4+ ) contributed to the NO conversion and Hg 0 oxidation. The bidentate sulfates formed by adsorbed SO 2 could provide new acid sites for NH 3 adsorption and increase the amount of NH 4 + , which reduced the poisoning effect of SO 2 and H 2 O. Based on the experimental results, a mechanism for the simultaneous removal of NO and Hg 0 was proposed for the V/ZrCe 0.6 catalysts: 2NH 3 /NH 4 + (ad) + NO 2 (ad) + NO(g) → 2N 2 + 3H 2 O + /2H + , Hg(ad) + Oβ → HgO(ad). [ABSTRACT FROM AUTHOR]

FeO and CeO modified activated coke (AC) synthesized by the equivalent-volume impregnation were employed to remove elemental mercury (Hg) from simulated flue gas at a low temperature. Effects of the mass ratio of FeO and CeO, reaction temperature, and individual flue gas components including O, NO, SO, and HO (g) on Hg removal efficiency of impregnated AC were investigated. The samples were characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Results showed that with optimal mass percentage of 3 % FeO and 3 % CeO on Fe3Ce3/AC, the Hg removal efficiency could reach an average of 88.29 % at 110 °C. Besides, it was observed that O and NO exhibited a promotional effect on Hg removal, HO (g) exerted a suppressive effect, and SO showed an insignificant inhibition without O to some extent. The analysis of XPS indicated that the main species of mercury on used Fe3Ce3/AC was HgO, which implied that adsorption and catalytic oxidation were both included in Hg removal. Furthermore, the lattice oxygen, chemisorbed oxygen, and/or weakly bonded oxygen species made a contribution to Hg oxidation. [ABSTRACT FROM AUTHOR]

In order to reduce the costs, the recycle of spent TiO-based SCR-DeNO catalysts were employed as a potential catalytic support material for elemental mercury (Hg) oxidation in simulated coal-fired flue gas. The catalytic mechanism for simultaneous removal of Hg and NO was also investigated. The catalysts were characterized by Brunauer-Emmett-Teller (BET), scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) method. Results indicated that spent TiO-based SCR-DeNO catalyst supported Ce-Mn mixed oxides catalyst (CeMn/SCR) was highly active for Hg oxidation at low temperatures. The CeMn/SCR performed the best catalytic activities, and approximately 92.80 % mercury oxidation efficiency was obtained at 150 °C. The inhibition effect of NH on Hg oxidation was confirmed in that NH consumed the surface oxygen. Moreover, HO inhibited Hg oxidation while SO had a promotional effect with the aid of O. The XPS results illustrated that the surface oxygen was responsible for Hg oxidation and NO conversion. Besides, the Hg oxidation and NO conversion were thought to be aided by synergistic effect between the manganese and cerium oxides. [ABSTRACT FROM AUTHOR]

A series of Ce-doped V 2 O 5 /TiO 2 catalysts synthesized by an ultrasound assisted impregnation method were employed to investigate simultaneous removal of elemental mercury (Hg 0 ) and NO in lab-scale experiments. Scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), X-ray diffractogram (XRD), and X-ray photoelectron spectroscopy (XPS) analyses were used to characterize the samples. Compared to TiO 2 support, the catalytic performance of CeO 2 doped on both TiO 2 and V 2 O 5/ TiO 2 catalysts have been improved. Remarkably, 1%V 2 O 5 –10% CeO 2 /TiO 2 (V1Ce10Ti) exhibited the highest Hg 0 oxidation efficiency of 81.55% at 250 °C with a desired NO removal efficiency under the same condition. Both the NO conversion and Hg 0 oxidation efficiency were enhanced in the presence of O 2 . The activity was inhibited by the injection of NH 3 with the increase of NH 3 /NO. When in the presence of 400 ppm SO 2 , Hg 0 oxidation was slightly affected. Furthermore, Hg 0 removal behavior under both oxidation and selective catalytic reduction (SCR) condition over V1Ce10Ti were well investigated to further probe into the feasibility of one single unit for multi-pollutants control in industry application. The existence of the redox cycle of V 4+ + Ce 4+ ↔ V 5+ + Ce 3+ in V 2 O 5 –CeO 2 /TiO 2 catalyst could not only greatly improve the NO conversion, but also promote the oxidation of Hg 0 . [ABSTRACT FROM AUTHOR]

In order to enhance the catalytic activity for elemental mercury (Hg 0 ) oxidation without the aid of HCl, CeO 2 was added into the support to modify V 2 O 5 –WO 3 /TiO 2 catalysts. The performance of V 2 O 5 –WO 3 /TiO 2 –CeO 2 (VWTiCe) catalysts on Hg 0 oxidation as well as the catalytic mechanism was also studied. The catalysts were characterized by BET, XRD and XPS techniques. The results showed that the performance on Hg 0 oxidation was promoted by the introduction of CeO 2 . NO and SO 2 has a promoting effect on Hg 0 oxidation in the presence of O 2 . Besides, the inhibitive effect of NH 3 on Hg 0 oxidation was confirmed by NH 3 consuming the surface oxygen of catalyst. The addition of CeO 2 improved the ability to resist H 2 O. Results also indicated that the Hg 0 oxidation efficiencies of V 0.80 WTiCe 0.25 catalysts were thought to be aided by synergistic effect between V 2 O 5 and CeO 2 . Hg 0 oxidation over V 0.80 WTiCe 0.25 follows a Mars–Maessen mechanism where lattice oxygen of V 2 O 5 reacts with adjacently absorbed Hg 0 . [ABSTRACT FROM AUTHOR]

Mn-Ce mixed oxides supported on commercial columnar activated coke (MnCe/AC) were employed to remove elemental mercury (Hg 0 ) at low temperatures (100–250 °C) without the assistance of HCl in flue gas. The samples were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD). Effects of some factors, including Mn-Ce loading values, active component, reaction temperatures and flue gas components (O 2 , SO 2 , NO, H 2 O), on Hg 0 removal efficiency were investigated. Results indicated that the optimal Mn-Ce loading value and reaction temperature were 6% and 190 °C, respectively. Considerable high Hg 0 removal efficiency (>90%) can be obtained over MnCe6/AC under both N 2 /O 2 atmosphere and simulated flue gas atmosphere at 190 °C. Besides, it was observed that O 2 and NO exerted a promotional effect on Hg 0 removal, H 2 O exhibited a suppressive effect, and SO 2 hindered Hg 0 removal seriously when in the absence of O 2 . Furthermore, the XPS spectra of Hg 4f and Hg-TPD results showed that the captured mercury were existed as Hg 0 and HgO on the MnCe6/AC, and HgO was the major species, which illustrated that adsorption and catalytic oxidation process were included for Hg 0 removal over MnCe6/AC, and catalytic oxidation played the critical role. What's more, both lattice oxygen and chemisorbed oxygen or OH groups on MnCe6/AC contributed to Hg 0 oxidation. MnCe6/AC, which exhibited excellent performance on Hg 0 removal in the absence of HCl, appeared to be promising in industrial application, especially for low-rank coal fired flue gas. [ABSTRACT FROM AUTHOR]

This work addressed the investigation of activated coke (AC) treated by acids. Effects of AC samples, modified by ether different acids (H 2 SO 4 , HNO 3 and HClO 4 ) or HClO 4 of varied concentrations, on Hg 0 removal were studied under simulated flue gas conditions. In addition, effects of reaction temperature and individual flue gas components including O 2 , NO, SO 2 and H 2 O were discussed. In the experiments, Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) were applied to explore the surface properties of sorbents and possible mechanism of Hg 0 oxidation. Results showed that AC sample treated by HClO 4 of 4.5 mol/L exhibited maximum promotion of efficiency on Hg 0 removal at 160 °C. NO was proved to be positive in the removal of Hg 0 . And SO 2 displayed varied impact in capturing Hg 0 due to the integrated reactions between SO 2 and modified AC. The addition of O 2 could improve the advancement further to some extent. Besides, the Hg 0 removal capacity had a slight declination when H 2 O was added in gas flow. Based on the analysis of XPS and FTIR, the selected sample absorbed Hg 0 mostly in chemical way. The reaction mechanism, deduced from results of characterization and performance of AC samples, indicated that Hg 0 could firstly be absorbed on sorbent and then react with oxygen-containing (C O) or chlorine-containing groups (C Cl) on the surface of sorbent. And the products were mainly in forms of mercuric chloride (HgCl 2 ) and mercuric oxide (HgO). [ABSTRACT FROM AUTHOR]

Abstract: The combined removals of Hg0 and NO over zeolite (HZSM-5 was chosen to use) modified by copper (Cu/HZSM-5) catalysts were studied under different simulated flue gas conditions. Compared with HZSM-5, Cu/HZSM-5 showed higher activity and performed a synergetic effect for the Hg0 and NO removal at 250°C. But the excess of copper could cause destruction of the thin pore walls and blocking of internal porosity of the catalyst leading to decrease of the activity. A comparison between Cu/HZSM-5 of different silica to alumina ratios (SiO2/Al2O3 ratio) was also performed. The highest NO and Hg0 conversions were observed over the lowest SiO2/Al2O3 ratio. In addition, the experimental results indicated that there was a synergetic effect between HZSM-5 and copper for the removal of NO and Hg0 by accelerating the intermediate formation (NO2) and by strengthening the adsorption NO and Hg0 on the catalyst surface under the reaction conditions. Moreover, the effects of individual flue gas components on the removals of Hg0 and NO were examined. O2 in the flue gas had a positive effect on both Hg0 and NO removals. However, the presence of H2O and SO2 inhibited both Hg0 and NO removals. [Copyright &y& Elsevier]

Abstract: Gas-phase elemental mercury (Hg0) removal by activated coke impregnated with cerium chloride (AICC) was studied under simulated flue gas conditions. Brunauer–Emmett–Teller (BET), X-ray diffractogram (XRD), scanning electron microscopy with energy dispersive X-ray spectrometry (SEM-EDX) and X-ray photoelectron spectroscopy (XPS) analyses were used to characterize the samples. The effects of CeCl3 loading values, reaction temperatures and individual flue gas components including O2, NO, SO2 and H2O (g) on Hg0 removal efficiency of AICC samples were investigated. Results showed that Hg0 removal efficiency of AC was significantly enhanced by CeCl3. The optimal CeCl3 loading value and reaction temperature was around 6% and 170°C, respectively. Additionally, the experiment results of effects of flue gas components on Hg0 removal efficiencies showed that when O2 was present in the flue gas, NO and SO2 were observed to promote Hg0 oxidation. However, in the absence of O2, SO2 showed an insignificant inhibition on Hg0 removal. Furthermore, when H2O was added into the flue gas, the Hg0 removal capacity had a slight declination. The analyses of XRD and XPS showed that Ce x O y and C–Cl were generated on the surface of AICC and those active elements had remarkably positive effects on the Hg0 removal. The reaction mechanism indicated that Hg0 oxidation was achieved through two pathways: one was that Hg0 bond with CeO2 and was converted by the catalytic oxidation of valence variable cerium; the other was that Hg0 reacted with C–Cl on the sample and was oxidized favored by chloride presence. And according to Hg 4f XPS analysis, the mercury on the surface of AICC was mainly in the form of mercuric oxide (HgO) and mercuric chloride (HgCl2). [Copyright &y& Elsevier]

Abstract: Mercury emission from coal-fired power plants becomes a great environmental concern due to its high toxicity and volatility in particularly for elemental mercury. Activated carbon adsorption is considered to be a potential technology to control elemental mercury emission. In this work, a novel CeO2/AC (activated carbon impregnated with cerium dioxide) sorbent was studied with an attempt to produce economical and effective sorbent for capturing mercury. The influencing factors researched include loading values changing from 1wt% to 10wt% and adsorption temperature changing from 30 to 200°C. Some physicochemical techniques such as BET and XRD were used to characterize the properties of the sorbents. The adsorption test results show that CeO2 impregnation significantly enhanced the AC adsorption ability for elemental mercury. When the CeO2 load was below 3%, Hg0 adsorption ability of ameliorated AC enhanced with the increase in the loading value, and then decreased at higher loading. The influence of temperature on the mercury removal efficiency was also studied, the trend of which was similar to the effect of loading value. The maximum removal efficiency was obtained at 100°C. [Copyright &y& Elsevier]

• SO 2 had a dual effect on Hg0 removal. • O 2 can offset the adverse effects caused by SO 2 and H 2 O. • 1V-8Ce/AC sorbent exhibited good sulfur resistance and excellent stability. The influences of SO 2 on Hg° removal over the 1V-8Ce/AC sorbent were systematically investigated at low temperatures. The experimental results showed that SO 2 has a dual effect on Hg° removal, that is, SO 2 has both a promoting effect and an inhibiting effect on Hg° removal. The SO 2 transient response experiment indicated that SO 2 could not only react with Hg° to promote the removal of Hg° but also react with the active components and poison the sorbent. O 2 is indispensable for the removal of Hg°, which can offset the adverse effects caused by SO 2 and H 2 O. HCl exhibited an obvious promoting effect on Hg° removal in the presence of SO 2. The 1V-8Ce/AC sorbent exhibited good sulfur resistance and excellent stability (E Hg = 90.04 %) after a 24 h reaction performed under the 1000 ppm SO 2 condition at 150 °C. In addition, the Hg-TPD and XPS methods were used to assist in studying the effect of SO 2 on Hg° removal over the 1V-8Ce/AC sorbent. Finally, the mechanism of Hg° removal in an SO 2 atmosphere was also explored, which showed that Hg° was removed by two possible pathways over the 1V-8Ce/AC sorbent. [ABSTRACT FROM AUTHOR]