Effect of surfactant, HCl and NH3 treatments on the regeneration of waste activated carbon used in selective catalytic reduction unit

Ko, Jeong Huy; Park, Rae-su; Jeon, Jong‐Ki; Kim, Do Heui; Jung, Sang‐Chul; Park, Young-Kwon

doi:10.1016/j.jiec.2015.08.003

Cited by 22 publications

(7 citation statements)

References 35 publications

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“…Activated carbon is used widely for the adsorption of noxious gases and heavy metals, as well as for wastewater treatment because of its large adsorption capacity, large surface area, and high porosity [16][17][18][19][20][21][22][23][24][25]. On the other hand, the price of commercial activated carbon produced from bituminous coal, coconut shell, wood, or peat is relatively high because of the costly raw materials and expensive activation process [26].…”

Section: Characterization Of the Charmentioning

confidence: 99%

“…On the other hand, it has an important drawback: its specific surface area, and therefore its adsorption capacity, is smaller than that of activated carbon. Various activation treatment methods have been proposed to enhance the adsorption capacity of biochar [16,46].…”

Section: Characterization Of the Charmentioning

confidence: 99%

“…Adsorption experiments were carried out according to the procedure suggested in previous studies [16,51,55]. A 10-liter aluminum bag was flushed using N 2 gas and vacuumed.…”

Section: Adsorption Of Formaldehydementioning

confidence: 99%

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Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Lee¹,

Park²,

Lee³

et al. 2016

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As a replacement for activated carbon, biochar was synthesized and used for the adsorptive removal of formaldehyde and nitrogen oxide. Biochar was produced from the fast pyrolysis of the red marine macro alga, Pyropia tenera. The P. tenera char was then activated with steam, ammonia and KOH to alter its characteristics. The adsorption of formaldehyde, which is one of the main indoor air pollutants, onto the seaweed char was performed using 1-ppm formaldehyde and the char was activated using a range of methods. The char activated with both the KOH and ammonia treatments showed the highest adsorptive removal efficiency, followed by KOH-treated char, ammonia-treated char, steam-treated char, and non-activated char. The removal of 1000-ppm NO over untreated char, KOH-treated char, and activated carbon was also tested. While the untreated char exhibited little activity, the KOH-treated char removed 80% of the NO at 50°C, which was an even higher NO removal efficiency than that achieved by activated carbon.

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Section: Characterization Of the Charmentioning

confidence: 99%

Section: Characterization Of the Charmentioning

confidence: 99%

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Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Lee¹,

Park²,

Lee³

et al. 2016

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“…The most commonly used adsorbent is activated carbon [15][16][17][18][19][20][21]. Among the alternative adsorbents that can replace activated carbon, biochar, a by-product of biomass pyrolysis, has recently received extensive attention because of its low cost [14,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Cu 2+ Removal Experimentsmentioning

confidence: 99%

Cu²⁺ion reduction in wastewater over RDF-derived char

Lee¹,

Park²,

Park³

et al. 2016

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Refuse-derived fuel (RDF) produced using municipal solid waste was pyrolyzed to produce RDF char. For the first time, the RDF char was used to remove aqueous copper, a representative heavy metal water pollutant. Activation of the RDF char using steam and KOH treatments was performed to change the specific surface area, pore volume, and the metal cation quantity of the char. N 2 sorption, Inductively Coupled Plasma-Atomic Emission Spectrometer (ICP-AES), and Fourier transform infrared spectroscopy were used to characterize the char. The optimum pH for copper removal was shown to be 5.5, and the steam-treated char displayed the best copper removal capability. Ion exchange between copper ions and alkali/alkaline metal cations was the most important mechanism of copper removal by RDF char, followed by adsorption on functional groups existing on the char surface. The copper adsorption behavior was represented well by a pseudo-second-order kinetics model and the Langmuir isotherm. The maximum copper removal capacity was determined to be 38.17 mg/g, which is larger than those of other low-cost char adsorbents reported previously.

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“…As the severe NO x emission situation and the rigorous emission legislation exhibit, many efforts have been made in NO x reduction [8]. SCR (selective catalytic reduction) of NO x with NH 3 [9][10][11][12] has been extensively proved to be the most efficient way for the removal of NO x from stationary sources. A catalyst is critical to create an efficient SCR reaction and operating cost [13].…”

Section: Introductionmentioning

confidence: 99%

Insights over Titanium Modified FeMgOx Catalysts for Selective Catalytic Reduction of NOx with NH3: Influence of Precursors and Crystalline Structures

Yang

et al. 2019

Catalysts

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Titanium modified FeMgOx catalysts with different precursors were prepared by coprecipitation method with microwave thermal treatment. The iron precursor is a key factor affecting the surface active component. The catalyst using FeSO4 and Mg(NO3)2 as precursors exhibited enhanced catalytic activity from 225 to 400 °C, with a maximum NOx conversion of 100%. Iron oxides existed as γ-Fe2O3 in this catalyst. They exhibited highly enriched surface active oxygen and surface acidity, which were favorable for low-temperature selective catalytic reduction (SCR) reaction. Besides, it showed advantage in surface area, spherical particle distribution and pores connectivity. Amorphous iron-magnesium-titanium mixed oxides were the main phase of the catalysts using Fe(NO3)3 as a precursor. This catalyst exhibited a narrow T90 of 200/250–350 °C. Side reactions occurred after 300 °C producing NOx, which reduced the NOx conversion. The strong acid sites inhibited the side reactions, and thus improved the catalytic performance above 300 °C. The weak acid sites appeared below 200 °C, and had a great impact on the low-temperature catalytic performance. Nevertheless, amorphous iron-magnesium-titanium mixed oxides blocked the absorption and activation between NH3 and the surface strong acid sites, which was strengthened on the γ-Fe2O3 surface.

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Effect of surfactant, HCl and NH3 treatments on the regeneration of waste activated carbon used in selective catalytic reduction unit

Cited by 22 publications

References 35 publications

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Cu²⁺ion reduction in wastewater over RDF-derived char

Insights over Titanium Modified FeMgOx Catalysts for Selective Catalytic Reduction of NOx with NH3: Influence of Precursors and Crystalline Structures

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Effect of surfactant, HCl and NH3 treatments on the regeneration of waste activated carbon used in selective catalytic reduction unit

Cited by 22 publications

References 35 publications

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Cu2+ion reduction in wastewater over RDF-derived char

Insights over Titanium Modified FeMgOx Catalysts for Selective Catalytic Reduction of NOx with NH3: Influence of Precursors and Crystalline Structures

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Cu²⁺ion reduction in wastewater over RDF-derived char