Simultaneous removal of Hg0 and NO from flue gas by Co0.3-Ce0.35-Zr0.35O2 impregnated with MnOx

Zhang, Xiaopeng; Cui, Yuezong; Wang, Jinxin; Tan, Bojian; Li, Chengfeng; Zhang, Hang; He, Gaohong

doi:10.1016/j.cej.2017.06.014

Cited by 44 publications

(31 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This alteration in the valence state of manganese species on the catalyst is a possible mechanism for NO reduction and Hg 0 oxidation (Yang et al, 2018a;Liu et al, 2019b;Yang et al, 2019b;Gao et al, 2019). The possible NH3-SCR reaction process of NO could be summarized as follows: gaseous NH3 was adsorbed on the Lewis and Brønsted acid sites on the surface of the catalyst, and formative coordinated NH3 and NH4 + reacted with gaseous NO and adsorbed NO2 via the Langmuir-Hinshlwood mechanism to convert into innocuous N2 and H2O (Zhang et al, 2017a;Zhao et al, 2018;Fu et al, 2014) . Moreover, we detected tiny amount of CO2 and CO in the outlet gas, as shown in Eqs.…”

Section: Mechanism Explorationmentioning

confidence: 99%

“…In response to increasing environmental consciousness and rigorous mercury emission regulations, plentiful technologies including catalytic oxidation and adsorption have been tremendously researched for Hg 0 removal in recent years (Gao et al, 2018a;Zhang et al, 2017a;Yang et al, 2019a). To date, activated carbon injection (ACI) for Hg 0 abatement is a commercial technology (Shen et al, 2018b;Zhao et al, 2018;Shi et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…To date, activated carbon injection (ACI) for Hg 0 abatement is a commercial technology (Shen et al, 2018b;Zhao et al, 2018;Shi et al, 2019). However, it suffers from some intractable bottlenecks, such as potential secondary contamination, huge operating costs, tardy regeneration rates and the value deterioration of fly ash (Zhang et al, 2017a;Zhao et al, 2018;Zhang et al, 2018). Furthermore, controlling NO and Hg 0 emissions by utilizing SCR and ACI independently confronts several inevitable shortcomings such as large equipment investment, high land requirement, huge maintaining and operating costs (Gao et al, 2018a;Gao et al, 2018b;Chen et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0

Xie

et al. 2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

A battery of agricultural straw derived biomass activated carbons supported LaOx modified MnOx (LaMn/BACs) was prepared by a facile impregnation method and then tested for the efficiency of simultaneous abatement of NO and Hg 0 . 15%LaMn/BAC manifested excellent removal efficiency of Hg 0 (100%) and NO (86.7%) at 180 °C, which also exhibited splendid resistance to SO2 and H2O. The interaction between Hg 0 removal and NO removal was explored, thereinto Hg 0 removal had no influence on NO removal, while NO removal preponderated over Hg 0 removal. The inhibitory effect of NH3 was greater than the accelerative effect of NO and O2 on Hg 0 removal. The physicochemical characterization of related samples were characterized by SEM, XRD, BET, H2-TPR, NH3-TPD and XPS. After incorporating suitable LaOx into 15%Mn/BAC, the synergistic effect between LaOx and MnOx contributed to the improvement of BET surface area and total pore volume, the promotion of redox ability, surface active oxygen species and acid sites, inhibiting the crystallization of MnOx. 15%LaMn/BAC has the best catalytic oxidation activity at low temperature. That might be answerable for superior performance and preferable tolerance to SO2 and H2O. Finally, the principle of catalytic oxidation was also discussesed in this article.

show abstract

Section: Mechanism Explorationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0

Xie

et al. 2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

show abstract

“…The Hg 0 removal test has been described in detail in our previous work [45]. The experimental reactor contains a gas distribution system, a Hg 0 vapor generating device, a fixed-bed quartz reactor (ID = 8 mm), an online mercury analyzer and a tail gas treating unit.…”

Section: Hg 0 Adsorption Experimentsmentioning

confidence: 99%

Promoting Effect of the Core-Shell Structure of MnO2@TiO2 Nanorods on SO2 Resistance in Hg0 Removal Process

Zhang

Han

et al. 2020

Catalysts

Self Cite

View full text Add to dashboard Cite

Sorbent of αMnO2 nanorods coating TiO2 shell (denoted as αMnO2-NR@TiO2) was prepared to investigate the elemental mercury (Hg0) removal performance in the presence of SO2. Due the core-shell structure, αMnO2-NR@TiO2 has a better SO2 resistance when compared to αMnO2 nanorods (denoted as αMnO2-NR). Kinetic studies have shown that both the sorption rates of αMnO2-NR and αMnO2-NR@TiO2, which can be described by pseudo second-order models and SO2 treatment, did not change the kinetic models for both the two catalysts. In contrast, X-ray photoelectron spectroscopy (XPS) results showed that, after reaction in the presence of SO2, S concentration on αMnO2-NR@TiO2 surface is lower than on αMnO2-NR surface, which demonstrated that TiO2 shell could effectively inhibit the SO2 diffusion onto MnO2 surface. Thermogravimetry-differential thermosgravimetry (TG-DTG) results further pointed that SO2 mainly react with TiO2 forming Ti(SO4)O in αMnO2-NR@TiO2, which will protect Mn from being deactivated by SO2. These results were the reason for the better SO2 resistance of αMnO2-NR@TiO2.

show abstract

“…However, Hg 0 is difficult to remove due to its high volatility and low water‐insolubility . In recent years, a number of technologies, such as sorbent injection, photochemical oxidation, and catalytic oxidation, have been proposed to control the emission of Hg 0 . Of these methods, catalytic oxidation to remove Hg 0 has been widely studied by researchers because of its properties of low cost, high Hg 0 removal efficiency, and regenerability.…”

Section: Introductionmentioning

confidence: 99%

Removal of elemental mercury by Ce and Co modified MCM‐41 catalyst from simulated flue gas

et al. 2018

Self Cite

View full text Add to dashboard Cite

Co and Ce based catalysts have been proven to possess a high Hg 0 removal efficiency. However, these catalysts have a low dispersion of active components and low mass transfer rate, which limits their catalytic activity. MCM-41 has a large surface area and a highly ordered mesoporous structure, which can improve the dispersion of Co and Ce, resulting in a high mass transfer rate. In this paper, different amounts of Co and Ce were loaded on MCM-41 to synthesize Co x -Ce x /MCM-41. The characteristic results of the catalyst showed that catalysts with a lower Co and Ce loading amount had a high dispersion and a low crystallinity, leading to more activity sites on the catalyst surface. Hence, the Hg 0 removal efficiency of the catalysts first increased with the increase of the Co and Ce loading amount. However, with the further increase of the Co and Ce loading amount, the crystallinity of the catalysts increased, which might cause the blockage of the pores and the decrease of BET surface areas, leading to a low Hg 0 removal efficiency. Along with the factors mentioned above, Co 0.15 -Ce 0.15 /MCM-41 had the best catalytic activity, which showed above 85 % Hg 0 removal efficiency in the temperature range of 200-300 8C at 180 000 h À1 . Flue gas components had different effects on catalytic activity. O 2 and NO could promote, but H 2 O and SO 2 inhibit the Hg 0 removal efficiency. The simulated flue gas of 300 ppm SO 2 , 400 ppm NO, 6 % H 2 O, and 5 % O 2 have serious effects on catalytic activity leading to a lower Hg 0 removal efficiency of 20 % for Co 0.15 -Ce 0.15 /MCM-4.

show abstract

Simultaneous removal of Hg0 and NO from flue gas by Co0.3-Ce0.35-Zr0.35O2 impregnated with MnOx

Cited by 44 publications

References 58 publications

LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0

LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0

Promoting Effect of the Core-Shell Structure of MnO2@TiO2 Nanorods on SO2 Resistance in Hg0 Removal Process

Removal of elemental mercury by Ce and Co modified MCM‐41 catalyst from simulated flue gas

Contact Info

Product

Resources

About