Promoting role of sulfur groups in selective catalytic reduction of NO with NH3 over H2SO4 modified activated carbons

Guo, Qianqian; Wen, Jing; Cheng, Shangzeng; Huang, Zhanggen; Sun, Duixiong; Hou, Yaqin; Han, Xiaojin

doi:10.1007/s11814-015-0076-0

Cited by 18 publications

(5 citation statements)

References 28 publications

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“…The other two peaks at 169.63 eV (2p 3/2 ) and 170.73 eV (2p 1/2 ) belong to sulfates. 31,32 For fresh Na(0.45)-SAC (Figure 6a), all of these peaks were weak. After the reaction (Figure 6b), the peaks of S 8 increased strongly, but the peaks of sulfates changed little, indicating that S 8 was the main product after removal of COS and H 2 S over Na(0.45)-SAC.…”

Section: Removal Mechanism Over Modified Sacmentioning

confidence: 99%

Resource Utilization of Spent Activated Coke as an Efficient Material for Simultaneous Removal of COS and H₂S

Liu

et al. 2022

Energy Fuels

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The desulfurization of blast furnace gas (BFG) is highly desired by iron and steel enterprises to realize its resource utilization with no environmental pollution. In this work, spent activated coke (SAC) modified by NaOH was innovatively reused as an efficient material for the removal of carbonyl sulfide (COS) and sulfuretted hydrogen (H 2 S) from BFG with admirable breakthrough sulfur capacities of 126.58 and 141.62 mg/g, respectively, and 100% removal efficiency of both COS and H 2 S could be reached with the total sulfur capacity of COS and H 2 S as high as 116.60 mg/g in the purification of the simulative BFG gas. The removal behaviors manifested that the removal process included catalytic hydrolysis of COS to H 2 S and subsequent oxidation of H 2 S to immobilize these sulfur species in the form of S 8 . The multiple structural characterizations (X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), H 2 -temperature-programmed reduction (TPR)) further revealed that the surface carbonyl and pyridine/pyrrolic groups together with the loaded hydroxyl ion enhanced the COS hydrolysis and the subsequent oxidation of H 2 S. The modified SAC possessed much richer pore structures and active groups than either fresh activated coke (FAC) or high specific surface area activated carbon (HAC). At the same time, a recycling scheme suitable for SAC after removing H 2 S and COS was proposed. The demonstrated excellent simultaneous removal capacity of COS and H 2 S over the modified SAC will provide a promising technical route for desulfurization of BFG with high efficiency and low cost.

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Section: Removal Mechanism Over Modified Sacmentioning

confidence: 99%

Resource Utilization of Spent Activated Coke as an Efficient Material for Simultaneous Removal of COS and H₂S

Liu

et al. 2022

Energy Fuels

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“…Most modification methods can improve the BET specific surface area and total pore volume. However, some modification methods reduce the BET specific surface area and total pore volume, but the surface functional groups and some specific properties can be improved to some extent. , Therefore, the BET specific surface area and total pore volume cannot be simply used to evaluate the modification effect of CAC. Instead, the modification effect should be evaluated according to the specific application.…”

Section: Modification Of Cacmentioning

confidence: 99%

“…He et al 98 found that although the BET specific surface area and total pore volume of CAC modified with silane decreased, the humidity of cigarette smoke treated with silane-modified CAC was greater. Guo et al 99 studied the influence of H 2 SO 4 modification and subsequent pyrolysis treatment on the pore structure and surface chemistry of CAC. The results showed that H 2 SO 4 modification had little effect on the BET specific surface area and total pore volume but promoted the formation of sulfur and oxygen groups.…”

Section: Modification Of Cacmentioning

confidence: 99%

Review on Coal-Based Activated Carbon: Preparation, Modification, Application, Regeneration, and Perspectives

Zhao

Mai

et al. 2023

Energy Fuels

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Coal is not only a type of fuel but also a precious resource with dual value attributes. Coal is usually used for combustion and electricity generation and is also used as a feedstock in the production of fuels, chemicals, and other high value-added products to improve efficiency. Among these products, coal-based activated carbon is an important part of the high value-added and resource utilization of coal. In this paper, the relevant research on coal-based activated carbon in recent decades is reviewed, including raw material selection, preparation process and mechanism, modification methods, application status, and regeneration methods. Finally, the existing problems and future research directions in the field of coal-based activated carbon are proposed, which has great significance for realizing the high valueadded utilization of coal resources.

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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%

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Lee¹,

Park²,

Lee³

et al. 2016

Carbon letters

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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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Promoting role of sulfur groups in selective catalytic reduction of NO with NH3 over H2SO4 modified activated carbons

Cited by 18 publications

References 28 publications

Resource Utilization of Spent Activated Coke as an Efficient Material for Simultaneous Removal of COS and H₂S

Resource Utilization of Spent Activated Coke as an Efficient Material for Simultaneous Removal of COS and H₂S

Review on Coal-Based Activated Carbon: Preparation, Modification, Application, Regeneration, and Perspectives

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

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Promoting role of sulfur groups in selective catalytic reduction of NO with NH3 over H2SO4 modified activated carbons

Cited by 18 publications

References 28 publications

Resource Utilization of Spent Activated Coke as an Efficient Material for Simultaneous Removal of COS and H2S

Resource Utilization of Spent Activated Coke as an Efficient Material for Simultaneous Removal of COS and H2S

Review on Coal-Based Activated Carbon: Preparation, Modification, Application, Regeneration, and Perspectives

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

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Product

Resources

About

Resource Utilization of Spent Activated Coke as an Efficient Material for Simultaneous Removal of COS and H₂S

Resource Utilization of Spent Activated Coke as an Efficient Material for Simultaneous Removal of COS and H₂S