Integrated removal of NO and mercury from coal combustion flue gas using manganese oxides supported on TiO 2

Zhang, Shibo; Zhao, Yuemin; Wang, Zonghua; Zhang, Junying; Wang, Lulu; Chen, Zheng

doi:10.1016/j.jes.2015.10.038

Cited by 53 publications

(27 citation statements)

References 46 publications

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“…Simultaneous removal performance of Hg 0 and NO was important for practical application of the catalyst in coal combustion power plant . In order to verify if the modified catalysts are more advantageous than the rudimentary catalyst, six catalysts (V‐W/Ti, 0.5 Na, 0.3 Ce, 0.3 Zr, 0.3 Ce–0.5 Na, and 0.3 Zr–0.5 Na) were selected to conduct the following investigation.…”

Section: Resultsmentioning

confidence: 99%

Investigation on elemental mercury removal and antideactivation performance of modified SCR catalysts

Cai

Wang

et al. 2018

Asia-Pacific J Chem Eng

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The ever-growing concern of mercury exhausted from coal-fired boiler is driving the requirement for using novel catalysts with stable Hg 0 removal efficiency. However, the influences of flue gas components on Hg 0 removal performance of modified and deactivated catalysts have been seldom investigated previously. The antideactivation ability of modified catalysts is still unclear. In this study, cerium (Ce) and zirconium (Zr) were utilized to modify the honeycomb V 2 O 5 -WO 3 /TiO 2 catalysts. Sodium (Na) was doped on the rudimentary and modified catalysts by impregnation method to obtain deactivated catalysts. Elemental mercury removal efficiency of the catalysts was measured using a lab-scale experimental system under various working conditions. Characterization of the catalysts was conducted to further analyze the mechanism of Hg 0 removal process. Physical adsorption plays an important role in Hg 0 removal over catalysts in the atmosphere of N 2 and O 2 . The introduction of SO 2 has an adverse effect on Hg 0 removal because of the competitive adsorption. NO and HCl motivate the Hg 0 removal through different mechanisms whereas NH 3 has little effect on the removal efficiency. Mars-Maessen mode could be responsible for the excellent Hg 0 removal performance and the splendid antideactivation ability of Ce-modified catalysts. The efficiency of Zr-modified catalysts is lower due to the decline of vanadium content.

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Section: Resultsmentioning

confidence: 99%

Investigation on elemental mercury removal and antideactivation performance of modified SCR catalysts

Cai

Wang

et al. 2018

Asia-Pacific J Chem Eng

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“…Installing low temperature SCR system (less than 200 °C) could solve the problem, as the SCR catalyst is unlikely to be deactivated compared with the catalyst for medium-temperature SCR. Therefore, the simultaneous removal of NO and Hg 0 by the oxidation at low temperature SCR system employing various catalysts has been proposed and investigated [29,30].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of NO and Hg0 using Fe and Co co-doped Mn-Ce/TiO2 catalysts

Shen

Zhu

Zhang

et al. 2018

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Fe and Co co-doped Mn-Ce/TiO2 (MCT) catalysts were investigated for the simultaneous removal of nitric oxide (NO) and elemental mercury (Hg 0 ) at reaction temperature lower than 200 °C. The catalysts were characterized by Brunauer-Emmett-Teller (BET), temperature program reduction (TPR), scanning electron microscope (SEM), x-ray diffraction (XRD) and x-ray photoelectron spectroscopy (XPS) analysis.The experimental results showed that the co-doped 2Fe4Co-MCT catalyst exhibited better performance for the simultaneous removal of NO and Hg 0 compared to Fe or Co doped catalysts. This could be due to higher BET surface area and better redox property of 2Fe4Co-MCT catalyst. In addition, we propose that chemisorbed O2 played a dominant role in selective catalytic reduction (SCR) of NO while lattice O2 played a key role in Hg 0 oxidation. The results also indicate that the introduction of Fe species enhanced the activity of SCR, whereas the introduction of Co species enhanced the oxidation of Hg 0 . The synergistic effect of Fe and Co species in the 2Fe4Co-MCT catalyst are also suggested to be an important mechanism for simultaneously removing NO and Hg 0 .

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“…e excessive Mn doping will further block the pores and reduce the contact probability of Hg 0 and the active site. Besides, as Mn content increased, the crystallinity of MnOx on the support was enhanced, which was adverse for its catalytic performance [42], resulting in a slight decrease of the Hg 0 removal efficiency. As shown in Figure 5(b), Mn remains the main active component of the adsorbent, but the doping of Ce can significantly increase the Hg 0 removal efficiency.…”

Section: Determination Of Mn and Ce Loadingmentioning

confidence: 99%

“…It has been revealed that Hg 0 oxidation over Mn-based catalyst follows the Mars-Maessen mechanism [42]. Hg 0 must adsorb onto the catalyst first and then be oxidized by the surface lattice oxygen to form HgO.…”

Section: Effect Of Reactionmentioning

confidence: 99%

Removal of Mercury from Coal-Fired Flue Gas and Its Sulfur Tolerance Characteristics by Mn, Ce Modified γ-Al₂O₃ Catalyst

Xie

Wang

et al. 2020

Journal of Chemistry

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Mercury pollution in the atmospheric environment is a matter of international concern. Mercury in coal-fired flue gas is the first human mercury emission source and has become the focus of national mercury pollution control. The catalytic performance of zerovalent mercury (Hg0) in coal-fired flue gas was studied by using manganese-cerium-aluminum oxide as catalyst. The effects of metal loading ratio, reaction temperature, calcination temperature, and O2 and SO2 concentration on the efficiency of Hg0 catalytic removal were investigated, and the Mn-Ce/γ-Al2O3 catalysts before and after the reaction were characterized by BET, SEM, XRD, and XPS to analyze the physicochemical properties of the samples. The results show that the mercury removal efficiency of the composite catalyst with Mn, Ce, and Al as the active component is higher than that of the single metal catalyst. The catalytic activity of Mn0.1Ce0.02Al is the best, the optimum reaction temperature is 150°C, the optimum calcination temperature is 400°C, and the O2 concentration in the conventional flue gas condition satisfies the effective oxidation of Hg0; SO2 in the flue gas can seriously inhibit the oxidation of Hg0.

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Integrated removal of NO and mercury from coal combustion flue gas using manganese oxides supported on TiO 2

Cited by 53 publications

References 46 publications

Investigation on elemental mercury removal and antideactivation performance of modified SCR catalysts

Investigation on elemental mercury removal and antideactivation performance of modified SCR catalysts

Simultaneous removal of NO and Hg0 using Fe and Co co-doped Mn-Ce/TiO2 catalysts

Removal of Mercury from Coal-Fired Flue Gas and Its Sulfur Tolerance Characteristics by Mn, Ce Modified γ-Al₂O₃ Catalyst

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Integrated removal of NO and mercury from coal combustion flue gas using manganese oxides supported on TiO 2

Cited by 53 publications

References 46 publications

Investigation on elemental mercury removal and antideactivation performance of modified SCR catalysts

Investigation on elemental mercury removal and antideactivation performance of modified SCR catalysts

Simultaneous removal of NO and Hg0 using Fe and Co co-doped Mn-Ce/TiO2 catalysts

Removal of Mercury from Coal-Fired Flue Gas and Its Sulfur Tolerance Characteristics by Mn, Ce Modified γ-Al2O3 Catalyst

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Removal of Mercury from Coal-Fired Flue Gas and Its Sulfur Tolerance Characteristics by Mn, Ce Modified γ-Al₂O₃ Catalyst