Simultaneous removal of Hg0 and NO from simulated flue gas over columnar activated coke granules loaded with La2O3-CeO2 at low temperature

Gao, Lei; Li, Caiting; Lu, Pei; Zhang, Jie; Du, Xueyu; Li, Shanhong; Tang, Le; Chen, Jiaqiang; Zeng, Guangming

doi:10.1016/j.fuel.2017.11.008

Cited by 61 publications

(32 citation statements)

References 59 publications

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“…O 3 , indicating that La 2 O 3 is highly dispersed on the catalyst surface in an amorphous state, which is similar to the literature 32. The XRD peak of Fe 2 O 3 ($33.15 , JCPDS no.…”

supporting

confidence: 87%

Fe₂O₃ enhanced high-temperature arsenic resistance of CeO₂–La₂O₃/TiO₂ catalyst for selective catalytic reduction of NO_x with NH₃

Wang

Xie

et al. 2021

RSC Adv.

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“…O 3 , indicating that La 2 O 3 is highly dispersed on the catalyst surface in an amorphous state, which is similar to the literature 32. The XRD peak of Fe 2 O 3 ($33.15 , JCPDS no.…”

supporting

confidence: 87%

Fe₂O₃ enhanced high-temperature arsenic resistance of CeO₂–La₂O₃/TiO₂ catalyst for selective catalytic reduction of NO_x with NH₃

Wang

Xie

et al. 2021

RSC Adv.

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“…Nitrogen oxides, such as NO and NO 2, commonly known as NOx are usually emitted from the consumption of fossil fuel in power generation and industrial production, endanger life and pose a threat to the environment [1, 2]. NO x has been considered one of the major air pollutants, which do not only harm the human body, but also trigger a series of serious environmental problems like global warming, photochemical smog, ozone depletion, and respiratory diseases [3, 4, 5]. NOx further reacts with OH − radicals in the atmosphere to form nitric acid, thereby producing acid rain [6].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

Kartohardjono

Merry

Rizky

et al. 2019

Heliyon

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Emissions of nitrogen oxides such as NO and NO2, which are commonly known as NOx, are threats to human existence and cause environmental problems. Mainly, two techniques have been developed to drastically reduce these emissions, which are dry and wet processes. The wet process has several advantages, major identifiable advantages are the adaptability to the flue gas, low operating temperatures and no poisoning and inactivation catalyst. Also, a mixture of hydrogen peroxide and nitric acid are used as absorbents solution for NOx reduction in the wet process. The advantages of using this mixture include the ability to reduce the negative effect of NOx and does not contaminate the scrubbing solution. In addition, nitric acid has an economical advantage in the process considering the fact that it is produced in the process. Finally, it can be conducted at ambient temperature. This study furthermore used a mixture of hydrogen peroxide and nitric acid solutions as an absorbent to reduce NOx in hollow fiber membrane modules. The hydrogen peroxide oxidized HNO2 to nitric acid, while enhances the oxidation through an autocatalytic reaction. The effects of the feed gas flow rate, hydrogen peroxide concentrations and number of fibers on the NOx reduction, absorbed NOx and flux were varied to study. The experimental results showed that the increase in the feed gas flow rate from 100 to 200 mL/min decreased NOx reduction from about 98 to 94% but increased the absorbed NOx and flux from about 0.13 to 0.255 mmol/h and 0.85–1.63 mmol/m2.h, respectively The increase in proportion of NOx in the feed gas effect was dominant than the increase in absorbed NOx. An increase in hydrogen peroxide concentration from 0.5 to 10 wt.% in the absorbent solutions increased NOx reduction, absorbed NOx and flux from about 94 to 98%, 0.257–0.267 mmol/h and 1.09–1.13 mmol/m2.h, respectively. Additionally, the H2O2 plays an important role in enhancing HNO2 oxidation to HNO3. Furthermore, an increase in the number of fibers from 50 to 150 in the membrane module increased NOx reduction and absorbed NOx from 86 to 97% and 0.23–0.27 mmol/h. Flux decreased from 2.98 to 1.13 mmol/m2.h due to increment in the gas-liquid contact surface area.

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“…The main advantages of activated coke are its high surface area, low cost, and suitability for use in both fixed and moving-reactor beds. Several CeO 2 -based oxides such as MnO x -CeO 2 , [63,66] CuO x -CeO 2 , [54] Fe 2 O 3 -CeO 2 , [61] La 2 O 3 -CeO 2, [57] and CoO x -CeO 2 [67] have been impregnated on activated coke with the aim of acting as promoters for Hg 0 removal. All these materials showed high Hg 0 removal efficiencies (> 90 %) due to the coupling of a high oxygen storage material (CeO 2 ) with other metal oxides.…”

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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Simultaneous removal of Hg0 and NO from simulated flue gas over columnar activated coke granules loaded with La2O3-CeO2 at low temperature

Cited by 61 publications

References 59 publications

Fe₂O₃ enhanced high-temperature arsenic resistance of CeO₂–La₂O₃/TiO₂ catalyst for selective catalytic reduction of NO_x with NH₃

Fe₂O₃ enhanced high-temperature arsenic resistance of CeO₂–La₂O₃/TiO₂ catalyst for selective catalytic reduction of NO_x with NH₃

Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

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

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Simultaneous removal of Hg0 and NO from simulated flue gas over columnar activated coke granules loaded with La2O3-CeO2 at low temperature

Cited by 61 publications

References 59 publications

Fe2O3 enhanced high-temperature arsenic resistance of CeO2–La2O3/TiO2 catalyst for selective catalytic reduction of NOx with NH3

Fe2O3 enhanced high-temperature arsenic resistance of CeO2–La2O3/TiO2 catalyst for selective catalytic reduction of NOx with NH3

Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

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

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Fe₂O₃ enhanced high-temperature arsenic resistance of CeO₂–La₂O₃/TiO₂ catalyst for selective catalytic reduction of NO_x with NH₃

Fe₂O₃ enhanced high-temperature arsenic resistance of CeO₂–La₂O₃/TiO₂ catalyst for selective catalytic reduction of NO_x with NH₃