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

Shen, Bo; Zhu, Shaowen; Zhang, Xiao; Chi, Guilong; Patel, Deepa; Meng, Shaoping; Wu, Chunfei

doi:10.1016/j.fuel.2018.03.080

Cited by 80 publications

(43 citation statements)

References 69 publications

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“…It is an attractive and promising denitrification technology. Therefore, it is urgent to study CO-SCR technology [187][188][189]. Besides, precious metals are expensive, have limited reserves and have poor high temperature performance.…”

Section: Co-scrmentioning

confidence: 99%

“…In order to further explore the performance of CO-SCR denitrification, Shen et al [187] found that the operating temperature window moved towards low temperature after Fe co-doping with Mn-Ce/TiO 2 . Yang et al [193] studied the application of gas sensor in denitrification.Chen et al [194] studied the CO+NO reaction on Pd/Al 2 O 3 and Pd/CeZrO 2 catalysts.…”

Section: Co-scrmentioning

confidence: 99%

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A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Liu

et al. 2019

Catalysts

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Nitrogen oxides (NO x ) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NO x , it is urgent to control NO x . According to the different mechanisms of NO x removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NO x . At the same time, the current research status and existing problems of different NO x removal technologies were revealed and the future development prospects were forecasted.Catalysts 2019, 9, 771 2 of 39 adsorption, oxidation, reduction, and plasma methods. In view of these attentive findings, adsorption method uses recyclable solid adsorbent material to adsorb NO x from flue gas through microporous structure, remarkably, environmentally friendly, no secondary pollution, and energy-saving and -efficient features make it stand out [18][19][20]. The oxidation process is a method that oxidizes NO into NO 2 or N 2 O 3 with high solubility under the action of an oxidant that is then absorbed by water or alkali solution. The process is simple and cost-saving, and is widely used in the wet flue gas denitrification process with relatively low cost and high removal efficiency of NO x ; except that the oxidized NO and SO 2 can be removed simultaneously to produce high value-added products [21][22][23]. The reduction method has the characteristics of high efficiency, cleanliness, and mildness; NO x removal can be realized at low temperature at present [24][25][26]. The plasma method is used to modify the surface of the catalyst, the dispersion of active species can be improved by plasma treatment, and the stability and low temperature activity of catalyst can be improved [27,28].Seldom, if ever, does a comprehensive article to introduce the current situation and treatment methods of removing NO x . In this paper, we tried to renovate, classify, and summarize the significant perspectives and most relevant findings reported in recent research articles and earlier reviews generalizing the mechanism analysis and research progress of NO x removal by adsorption, oxidation, reduction, and plasma methods, which can provide means for promoting the technological progress of pollution prevention, maintaining healthy development of factories continuously, studying the methods of removing NO x deeply, and mastering different technologies of removing NO x , as well as providing guidance for controlling the emission of NO x from motor vehicles such as diesel, gasoline, and so on. In order to improve the environmental quality and save the ecological environment, this paper further provides a convenient, low-cost, efficient, and economic guidance line.

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Section: Co-scrmentioning

confidence: 99%

Section: Co-scrmentioning

confidence: 99%

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Liu

et al. 2019

Catalysts

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“…As shown in Figure , the CeO 2 ‐TiO 2 sorbent can easily dissociate H 2 S into active S. Thereby adsorbed Hg 0 can react with S, leading to the formation of HgS. The other advantage of CeO 2 is that the surface oxygen can react with other flue gases (HCl and NH 3 ) and the products can enhance the Hg 0 removal process by interacting with Hg and forming oxidized mercury products …”

Section: Hg0 Removalmentioning

confidence: 99%

“…The other advantage of CeO 2 is that the surface oxygen can react with other flue gases (HCl and NH 3 ) and the products can enhance the Hg 0 removal process by interacting with Hg and forming oxidized mercury products. [73,77,92,111] Several researchers have investigated the positive effect of SO 2 on Hg 0 removal using CeO 2 -TiO 2 -based catalysts. [79,95] Zhang et al [79] proposed that the increased Hg 0 removal over CeO 2 -TiO 2 follows the Langmuir-Hinshelwood mechanism, where the adsorbed Hg 0 (Equation 9) reacts with the surface oxygen of CeO 2 to form HgO (Equation 10).…”

Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning

confidence: 99%

Role of Ceria in the Design of Composite Materials for Elemental Mercury Removal

Jampaiah

Chalkidis

Sabri

et al. 2018

The Chemical Record

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The necessity to drastically act against mercury pollution has been emphatically addressed by the United Nations. Coal‐fired power plants contribute a great deal to the anthropogenic emissions; therefore, numerous sorbents/catalysts have been developed to remove elemental mercury (Hg0) from flue gases. Among them, ceria (CeO2) has attracted significant interest, due to its reversible Ce3+/Ce4+ redox pair, surface‐bound defects and acid‐base properties. The removal efficiency of Hg0 vapor depends among others, on the flue gas composition and temperature. CeO2 can be incorporated into known materials in such a way that the abatement process can be effective at different operating conditions. Hence, the scope of this account is to discuss the role of CeO2 as a promoter, active phase and support in the design of composite Hg0 sorbents/catalysts. The elucidation of each of these roles would allow the integration of CeO2 advantageous characteristics to such degree, that tailor‐made environmental solution to complex issues can be provided within a broader application scope. Besides, it would offer invaluable input to theoretical calculations that could enable the materials screening and engineering at a low cost and with high accuracy.

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“…The metal oxides loaded on AC can also improve denitrification activity significantly. The oxides of transition metals, such as V, Mn, Fe, Cr, and Ni, impregnated on AC can efficiently promote the removal of NO . The transition metal oxides can highly disperse onto an inert carrier to remove NO as active components and play a dominant role in NO oxidation .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the denitrification efficiency over low‐rank activated coke by doping with transition metal oxides

Meng

Cheng

et al. 2020

Can J Chem Eng

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Low-rank activated coke (AC) is widely used for industrial flue gas purification due to its multipollutant cooperative removal capability. To enhance the denitrification capacity of AC for the selective catalytic reduction (SCR) of NO with NH 3 , several transition metal (Fe, Mn, Ce, V) oxides were uniformly loaded into AC by solvent impregnation. Compared to untreated AC, modified AC showed excellent denitrification efficiency above 90%. N 2 adsorptiondesorption and Raman spectroscopy techniques were used to characterize the pore size distribution and crystal structure of AC samples. The introduction of transition metal oxides had little effect on the pore structure of AC but increased the nitrogen-containing functional groups, which facilitated NO removal. Moreover, x-ray photoelectron spectroscopy (XPS) was used to analyze the valence changes of metal elements before and after denitrification.After the reaction, the content increase of the low-valence metal oxides indicated that the transition metal oxides were involved in the reaction of NO with NH 3 . High-valence metal oxides oxidized NO to NO 2 , which reacts more easily with NH 3 , thereby increasing the denitrification efficiency. Importantly, in the presence of SO 2 , modified AC still presented high denitrification performance.This transition metal oxides doping method can effectively improve the ability of low-rank AC to remove NO in multi-contaminant flue gas. K E Y W O R D Sactivated coke, denitrification, flue gas, SCR, transition metal oxides

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

Cited by 80 publications

References 69 publications

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

A Critical Review of Recent Progress and Perspective in Practical Denitration Application

Role of Ceria in the Design of Composite Materials for Elemental Mercury Removal

Enhancement of the denitrification efficiency over low‐rank activated coke by doping with transition metal oxides

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