scholarly journals Study on the Preparation of Magnetic Mn–Co–Fe Spinel and Its Mercury Removal Performance

Separations ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 225
Author(s):  
Jiawei Huang ◽  
Zhaoping Zhong ◽  
Yueyang Xu ◽  
Yuanqiang Xu
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Volume Fraction ◽  
Fixed Bed ◽  
Mercury Removal ◽  
Stoichiometric Ratio ◽  
Doping Amount ◽  
Continuous Increase ◽  
Temperature Range ◽  
Physical And Chemical

In this study, the manganese-doped manganese–cobalt–iron spinel was prepared by the sol–gel self-combustion method, and its physical and chemical properties were analyzed by XRD (X-ray diffraction analysis), SEM (scanning electron microscope), and VSM (vibrating sample magnetometer). The mercury removal performance of simulated flue gas was tested on a fixed bed experimental device, and the effects of Mn doping amount, fuel addition amount, reaction temperature, and flue gas composition on its mercury removal capacity were studied. The results showed that the best synthesized product was when the doping amount of Mn was the molar ratio of 0.5, and the average mercury removal efficiency was 87.5% within 120 min. Among the fuel rich, stoichiometric ratio, and fuel lean systems, the stoichiometric ratio system is most conductive to product synthesis, and the mercury removal performance of the obtained product was the best. Moreover, the removal ability of Hg0 was enhanced with the increase in temperature in the test temperature range, and both physical and chemical adsorption play key roles in the spinel adsorption of Hg0 in the medium temperature range. The addition of O2 can promote the removal of Hg0 by adsorbent, but the continuous increase after the volume fraction reached 10% had little effect on the removal efficiency of Hg0. While SO2 inhibited the removal of mercury by adsorbent, the higher the volume fraction, the more obvious the inhibition. In addition, in an oxygen-free environment, the addition of a small amount of HCl can promote the removal of mercury by adsorbent, but the addition of more HCl does not have a better promotion effect. Compared with other reported adsorbents, the adsorbent has better mercury removal performance and magnetic properties, and has a strong recycling performance. The removal efficiency of mercury can always be maintained above 85% in five cycles.

scholarly journals Removal of Elemental Mercury from Flue Gas using the Magnetic Attapulgite by Mn-Cu Oxides Modification

2021 ◽  
Author(s):  
Yifei Long ◽  
Zhong He ◽  
Xiaoyi Li ◽  
Yajie Yin ◽  
Yuan Wang ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Active Sites ◽  
Chemical Properties ◽  
Elemental Mercury ◽  
Mercury Removal ◽  
Impregnation Method ◽  
Active Components ◽  
Co Precipitation ◽  
Physical And Chemical

Abstract Mercury pollution has become one of the most concerned environmental issues in the world because of its high toxicity, non-degradability and bioaccumulation. Attapulgite adsorbents modified by magnetic manganese-copper (MnxCuy-MATP) were fabricated by co-precipitation and ultrasonic impregnation method,aiming at removing Hg0 from coal-fired flue gas. BET, SEM, XRD, VSM and XPS were used to systematically explore the physical and chemical properties of the adsorbents, the effects of manganese and copper additions, reaction temperature and various components in the flue gas on the efficiency of Hg0 removal were investigated. Mn8Cu5-MATP exhibited the optimal properties, and excessive copper loadings led to the aggregation of the active components. The efficiency of mercury removal can be effectively improved by NO and HCl regardless of the absence and presence of O2, because the NO+, NO3, NO2 and Cl* produced during the reaction can promote the adsorption and oxidation of Hg0. SO2 and H2O inhibited the oxidation of Hg0 because of the competitive adsorption at the active sites, while a large amount of sulfite and sulfate were formed to block the pores. However, the introduction of copper caused the sample to obtain SO2 resistance, which resulted in a mercury removal efficiency of 84.3% even under 1500 ppm SO2. In addition, after 5 cycles of adsorption and regeneration, Mn8Cu5-MATP can still maintain excellent Hg0 removal ability. The fabricated adsorbent can save the actual production cost and effectively improve the mercury removal efficiency in sulfur-containing flue gas.

Experimental Research on Fly Ash Modified Adsorption of Mercury Removal Efficiency of Flue Gas

2013 ◽  
Vol 800 ◽  
pp. 132-138 ◽  
Author(s):  
Li Li ◽  
Si Wei Pan ◽  
Jiang Jun Hu ◽  
Ji Fu Kuang ◽  
Min Qi ◽  
...  
Keyword(s):  
Fly Ash ◽  
Removal Efficiency ◽  
Flue Gas ◽  
Power Plants ◽  
Physical Adsorption ◽  
Adsorption Properties ◽  
Mercury Removal ◽  
Immersion Method ◽  
Adsorption Temperature ◽  
Modified Fly Ash

Mercury in the flue gas in coal-fired power plant as the research object using halogen compound as the modified material, the fly ash was modified by chemical immersion method，Study on adsorption agent, the adsorption temperature, modified material and loading on mercury adsorption of flue gas in coal-fired power plants. Experiments showed that, iodine adsorption properties of modified fly ash was the most significant, with the increase of the sorbent dosage, Hg removal efficiency increased, fly ash adsorption amount of change was not obvious, between 80-140°C temperature range, fly ash on mercury existed mainly physical adsorption, the mercury removal efficiency decreased with the increase of temperature, chemical adsorption occurred at 160°C, mercury removal efficiency increased.

Mass Balance and Isotope Characteristics of Mercury in Two Coal-Fired Power Plants in Guizhou, China

2012 ◽  
Vol 518-523 ◽  
pp. 2576-2579 ◽  
Author(s):  
Zhong Gen Li ◽  
Xin Bin Feng ◽  
Guang Hui Li ◽  
Run Sheng Yin ◽  
Ben Yu
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Power Plants ◽  
Electrostatic Precipitator ◽  
Isotope Composition ◽  
Flue Gas Desulfurization ◽  
Guizhou Province ◽  
Mercury Removal ◽  
Stable Isotope Composition ◽  
Coal Properties

Mercury distribution and stable isotope composition in solid samples of two coal-fired power plants in Guizhou province were determined. Results shown electrostatic precipitator (ESP) has mercury removal efficiency between 29.53% to 58.41%, and wet flue gas desulfurization (WFGD) between 12.29% to 58.60%, mercury removal efficiency of ESP and WFGD mainly depends on the coal properties. Most mercury (70% to 88%) in coal was captured by the combination of ESP+WFGD. Mercury in fly ash and gypsum were much heavier in isotope composition compared to the coal, hints mercury escaped into atmosphere was enriched in lighter mercury isotopes.

Experimental Study on Titanium Based Photocatalyst and its Catalytic Oxidation on Flue Gas Mercury

2012 ◽  
Vol 252 ◽  
pp. 293-297
Author(s):  
Xue Shi ◽  
Xue Wei Dai ◽  
Jiang Wu ◽  
Xian Li ◽  
Yi Ran Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Removal Efficiency ◽  
Flue Gas ◽  
Photocatalytic Oxidation ◽  
Elemental Mercury ◽  
Mercury Removal ◽  
Mass Ratio ◽  
Photo Catalytic Oxidation ◽  
Iron Doped ◽  
Oxidation System

This paper mainly studied the effects of different iron-doped volume on photo-catalytic oxidation of TiO2 for mercury removal. Through the photocatalytic oxidation system, we evaluated the elemental mercury removal performance of TiO2 with iron-doped mass ratio of 0.5%, 1%, 2% and 3%. While the iron-doped mass ratio were 0.5%, 1%, 2% and 3%, the elemental mercury removal efficiency were 70.83%，52.89%，72.32% and 62.39% respectively, the removal efficiency increased firstly, then declined, and 2% iron-doped was the most appropriate

scholarly journals Gas-phase elemental mercury removal by nano-ceramic material

2020 ◽  
Vol 10 ◽  
pp. 184798041989975
Author(s):  
Tao Zhu ◽  
Weidong Jing ◽  
Xing Zhang ◽  
Wenjing Bian ◽  
Yiwei Han ◽  
...  
Keyword(s):  
Gas Phase ◽  
Gas Flow ◽  
Removal Rate ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Mercury Removal ◽  
Bet Surface Area ◽  
Mercury Adsorption ◽  
Experimental Conditions ◽  
Physical And Chemical

The nano-ceramic which is mesoporous silica material was applied to test the removal efficiency of gas-phase Hg0 using a fixed-bed reactor. The physical and chemical properties of nano-ceramic were investigated by various techniques such as BET surface area (BET), X-ray diffraction, fourier transform infrared spectrometer (FTIR), and scanning electron microscope (SEM); then, the sample was tested for mercury adsorption under different conditions. The mercury adsorption tests shown that different Hg0 concentration, adsorption temperature, gas flow rate, and different gas components have significant effects on the mercury removal performance of nano-ceramic, and the adsorption removal rate of nano-ceramic can be 75.58% under the optimal experimental conditions. After fitting the experimental data to the adsorption model, it was found that the theoretical maximum mercury adsorption amount q max of nano-ceramic is 1.61 mg g−1 and there were physical and chemical adsorption at the same time. The adsorption kinetics fitting results shown that the adsorption process of nano-ceramic exhibits multi-segment characteristics of “transmembrane–diffusion–adsorption.”

scholarly journals Screening of Metal Modified HKUST-1 to Enhance Mercury Removal Efficiency

2021 ◽  
Vol 261 ◽  
pp. 02032
Author(s):  
Mingjie Zhang ◽  
Hongzhe Li ◽  
Gang Yang ◽  
Jiahui Yu ◽  
Yipei Chen
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Removal Rate ◽  
Sample Surface ◽  
Acid Sites ◽  
Manganese Chloride ◽  
Mercury Removal ◽  
Brønsted Acid Sites ◽  
Common Component ◽  
Brönsted Acid

In this work, HKUST-1 and different metal modified HKUST-1 materials were investigated in Hg0 removal performance under air condition. Results showed that the pristine HKUST-1 only has a mercury removal rate of around 20%. After metal modification of HKUST-1, the removal efficiency was significantly improved. Among different modification materials employed in this study, HKUST-1 modified by manganese chloride exhibited the highest Hg0 removal efficiency of 95% at 250 oC. This value is relatively high compared with most previously reported catalysts. In addition, this study reveals that the enhanced Hg0 removal efficiency results from the increase of Brønsted acid sites on the sample surface, which is vital to Hg0 removal. Furthermore, it is found that SO2 produced little toxicity to Mn(Cl)/HKUST-1 in the presence of O2. This is beneficial to remove Hg0 in the industrial flue gas, where SO2 is a common component. Therefore, Mn(Cl)/HKUST-1 synthesized here is a promising catalyst for Hg0 removal.

The Study on the Performance of Wet Limestone-Gypsum Flue Gas Mercury Removal Additive

2013 ◽  
Vol 448-453 ◽  
pp. 608-612
Author(s):  
Li Bao Yin ◽  
Qi Sheng Xu ◽  
Jiang Jun Hu ◽  
Yang Heng Xiong ◽  
Si Wei Chen
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Total Mercury ◽  
Elemental Mercury ◽  
Flue Gas Desulfurization ◽  
Mercury Removal ◽  
Additive Increase ◽  
Calcium Sulfite

The influences on the performance of wet flue gas desulfurization system in mercury removing after adding mercury removal additive were studied. As a consequence, the mercury removal efficiency can be improved by this kind of additive, that the efficiency of elemental mercury and total mercury is raised along with the amount of additive is increased. And so can the desulfuration efficiency. The oxidation of calcium sulfite in desulfurization is promoted by the mercury removal additive, increase the reduce speed of calcium sulfite concentration.

Experimental Study of the Fly Ash Iron Morphology Effect on Flue Gas Mercury Removal

2013 ◽  
Vol 864-867 ◽  
pp. 1513-1518
Author(s):  
Can Li ◽  
Jin Hong Zhang ◽  
Jiang Wu ◽  
Xian Bing Zhang ◽  
Xian Tuo Chen ◽  
...  
Keyword(s):  
Experimental Study ◽  
Fly Ash ◽  
Species Distribution ◽  
Flue Gas ◽  
Power Plants ◽  
Magnetic Beads ◽  
Fixed Bed ◽  
Mercury Removal ◽  
Morphology Effect ◽  
Fixed Bed System

In this paper, magnetic beads were separated from two different power plants fly ash by magnetic separation, and the separated magnetic beads were analyzed by XRD. In a self-built fixed-bed system, the experiments that magnetic beads from two power plants, α-Fe2O3 and γ-Fe2O3 affect formation distribution of mercury in flue gas were carried out. The results showed that the magnetic beads in fly ash have a certain capacity to oxidize the mercury in flue gas, and the γ-Fe2O3 has greater influence on the species distribution of mercury than α- Fe2O3.

Sign in / Sign up

Export Citation Format

Share Document