Simultaneous removal of HCHO and elemental mercury from flue gas over Co-Ce oxides supported on activated coke impregnated by sulfuric acid

Chen, Jiaqiang; Li, Caiting; Li, Shanhong; Lu, Pei; Gao, Lei; Du, Xueyu; Yi, Yaoyao

doi:10.1016/j.cej.2018.01.043

Cited by 47 publications

(22 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CoCe-MA As shown in Figure 6, three reduction peaks were observed in the temperature range of 50-900 • C. According to the literature [39,41], the first reduction peak (P H2 -I) was attributed to the reduction of Co 3 O 4 to CoO, while the second peak (P H2 -II) was due to the further reduction of CoO to metallic cobalt [42]. In addition, the weak reduction peaks around 480 • C (P H2 -III) could be ascribed to the reduction of surface oxygen species of CeO 2 [43,44].…”

Section: Ph2-i Ph2-ii Ph2-iii Total Ratio Of Ph2-ii /Ph2-i T50 (°C) Tmentioning

confidence: 69%

“…In other words, the CoCe-MA catalyst exhibited the highest concentration of surface Ce 3+ species. The presence of Ce 3+ could cause charge imbalance and oxygen vacancies of catalysts, resulting in more active surface oxygen species [40,41]. Thus, the concentration of surface Ce 3+ species may be closely related to the catalytic activity of the catalysts.…”

Section: Xps Resultsmentioning

confidence: 99%

“…Thus, the order of catalytic activity was the same as that of surface O ads /O lat atomic ratios. As revealed by the literature [39,41], not only the surface oxygen species but also the distribution of the valence of the metal ions can affect the catalytic activity by the number of oxygen vacancies. The nonstoichiometric Co 2+ , as well as the presence of Ce 3+ on the surface, could increase the vacancies and unsaturated chemical bonds on the surface, resulting in more surface oxygen species.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

et al. 2019

View full text Add to dashboard Cite

Cobalt cerium oxide catalysts with small molecular organic acids (SOAs) as chelating agents were prepared via the sol–gel method and investigated for the complete oxidation of toluene. Four kinds of natural SOAs, i.e. malic acid (MA), citric acid (CA), glycolic acid (GA), and tartaric acid (TA), were selected. The effect of organic acids on the composition, structure, morphology and catalytic performance of metal oxides is discussed in details. The cobalt cerium oxides catalysts were characterized by various techniques, including TG–DSC, XRD, SEM–EDS, N2–adsorption and desorption, XPS, and H2–TPR analyses. The results show that the nature of organic acids influenced the hydrolysis, condensation and calcination processes, as well as strongly affected the textural and physicochemical properties of the metal oxides synthesized. The best catalytic activity was obtained with the CoCe–MA catalyst, and the toluene conversion reached 90% at 242 °C. This outstanding catalytic activity could be related to its textural, redox properties and unique surface compositions and oxidation states. In addition, the CoCe–MA catalyst also showed excellent stability in long–time activity test.

show abstract

Section: Ph2-i Ph2-ii Ph2-iii Total Ratio Of Ph2-ii /Ph2-i T50 (°C) Tmentioning

confidence: 69%

Section: Xps Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Therefore, combined with a series of characterization results mentioned above, Mn 8 Cu 5 -MATP possessed the unique microstructure, larger speci c surface area, more active sites and stronger oxygen migration ability, which was bene cial to mercury removal. improved from 0-6%, the mercury removal e ciency signi cantly increased to 91.1%, which can be ascribed to the regeneration of O A and O B consumed during the removal process and the replenishment of gas-phase oxygen (Chen et al 2018). Nevertheless, the improvement of mercury removal e ciency was negligible when the O 2 concentration further increased to 9%, which denoted that 6% O 2 was su cient to complete the oxidation of Hg 0 .…”

Section: Effect Of Manganese and Copper Loadingmentioning

confidence: 98%

Removal of elemental mercury from flue gas using the magnetic attapulgite by Mn-Cu oxides modification

Long

et al. 2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

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 modi ed by magnetic manganese-copper (Mn x Cu y -MATP) were fabricated by co-precipitation and ultrasonic impregnation method,aiming at removing Hg 0 from coal-red ue 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 ue gas on the e ciency of Hg 0 removal were investigated. Mn 8 Cu 5 -MATP exhibited the optimal properties, and excessive copper loadings led to the aggregation of the active components. The e ciency of mercury removal can be effectively improved by NO and HCl regardless of the absence and presence of O 2 , because the NO + , NO 3 , NO 2 and Cl* produced during the reaction can promote the adsorption and oxidation of Hg 0 . SO 2 and H 2 O inhibited the oxidation of Hg 0 because of the competitive adsorption at the active sites, while a large amount of sul te and sulfate were formed to block the pores. However, the introduction of copper caused the sample to obtain SO 2 resistance, which resulted in a mercury removal e ciency of 84.3% even under 1500 ppm SO 2 . In addition, after 5 cycles of adsorption and regeneration, Mn 8 Cu 5 -MATP can still maintain excellent Hg 0 removal ability. The fabricated adsorbent can save the actual production cost and effectively improve the mercury removal e ciency in sulfur-containing ue gas.

show abstract

“…Coal‐fired power plant is regarded as the largest contributor for the anthropogenic mercury emission . Generally, mercury species in flue gas derived from coal combustion can be classified into three forms: elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ) and particulate‐bound mercury (Hg p ) . Hg p and Hg 2+ can be effectively removed by the conventional air pollution control devices, such as particulate matter control devices (PMCDs) and wet flue gas desulfurization systems (WFGDs), because of their physical properties .…”

Section: Introductionmentioning

confidence: 99%

Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Zhang

Cao

et al. 2020

Applied Organom Chemis

View full text Add to dashboard Cite

The Co‐modified CeO2‐TiO2 catalyst prepared by facile co‐precipitation was used for efficient elemental mercury oxidation in flue gas. Results indicated that Co doping greatly enhanced the activity and SO2 resistance of the CeO2‐TiO2 catalyst. In the presence of 5% O2, 500 ppm NO, 800 ppm SO2 and 3% H2O at 200 °C, the Hg0 removal efficiency of CeCo3/Ti could maintain at about 87% for a relatively long time. Characterizations of catalysts (BET, XRD, Raman spectroscopy, TEM, H2‐TPR, O2‐TPD, XPS, TG‐MS and SO2‐DRIFTS) were carried out to reveal the mechanism of Co modification on the redox ability, SO2 resistance and resultant mercury oxidation removal performance of catalyst. It was found that an interaction of Ce with Co promoted the dispersion of CeO2, increased chemisorbed oxygen concentration, and improved the oxygen storage capacity and the reducibility of catalyst, which was beneficial to the improvement of Hg0 oxidation removal. Hg0 would adsorb onto the catalyst and react with surface active oxygen species replenished by gas‐phase O2 to be oxidized via Mars‐Maessen mechanism. SO2 consumed the surface active oxygen species and resulted in the reduction of Ce4+ to Ce3+, which induced the deactivation of catalyst. The introduced Co in CeO2‐TiO2 catalyst exerted the function of protecting Ce4+ from being poisoned by SO2 and thus promoted the sulfur resistance and Hg0 removal performance of the catalyst in the presence of SO2.

show abstract

Simultaneous removal of HCHO and elemental mercury from flue gas over Co-Ce oxides supported on activated coke impregnated by sulfuric acid

Cited by 47 publications

References 53 publications

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

Removal of elemental mercury from flue gas using the magnetic attapulgite by Mn-Cu oxides modification

Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Contact Info

Product

Resources

About

Simultaneous removal of HCHO and elemental mercury from flue gas over Co-Ce oxides supported on activated coke impregnated by sulfuric acid

Cited by 47 publications

References 53 publications

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

Removal of elemental mercury from flue gas using the magnetic attapulgite by Mn-Cu oxides modification

Enhanced activity and SO2 resistance of Co‐modified CeO2‐TiO2 catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Contact Info

Product

Resources

About

Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas