The study on continuous denitrification, desulfurization of pyrolusite/activated coke hybrid catalyst

Yang, Lin; Lu, Yong; Jiang, Wenju; Jiang, Xia; Li, Jianjun

doi:10.1039/c7ra11720e

Cited by 7 publications

(4 citation statements)

References 39 publications

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“…12 It is noteworthy that the content and type of Scontaining functional groups also developed during the C-S−R process. 12,24,25 In other words, in situ S-doping is induced by the C-S−R process. However, the impact of S-containing groups on the physicochemical properties and migration behavior of intrinsic sites has not been thoroughly investigated.…”

Section: Introductionmentioning

confidence: 99%

“…21,22 Obviously, regeneration plays a crucial role in the long-term operation of an integrated removal system. 12,23 Li et al investigated the impact of the cyclic desulfurization and regeneration (C-S−R) process on denitration performance and proposed that the enhanced SCR activity could be attributed to the increase in O-containing groups. 12 It is noteworthy that the content and type of Scontaining functional groups also developed during the C-S−R process.…”

Section: Introductionmentioning

confidence: 99%

“…In industrial applications, NO x is usually purified via a moving bed system with simultaneous removal of SO 2 (Figure S1), and carbon materials undergo sequential processes of desulfurization, regeneration, and NH 3 -SCR. , It is widely accepted that H 2 SO 4 is the end product of the desulfurization process over carbon when O 2 and H 2 O coexist and gradually accumulates in the pores. , Obviously, regeneration plays a crucial role in the long-term operation of an integrated removal system. , Li et al investigated the impact of the cyclic desulfurization and regeneration (C-S–R) process on denitration performance and proposed that the enhanced SCR activity could be attributed to the increase in O-containing groups . It is noteworthy that the content and type of S-containing functional groups also developed during the C-S–R process. ,, In other words, in situ S-doping is induced by the C-S–R process. However, the impact of S-containing groups on the physicochemical properties and migration behavior of intrinsic sites has not been thoroughly investigated.…”

Section: Introductionmentioning

confidence: 99%

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In Situ S-Doping Engineering for Highly Efficient NH₃–SCR over Metal-Free Carbon Catalysts: A Novel Synergetic Promotional Mechanism

Zhu,

Yuan,

Peng

et al. 2023

Environ. Sci. Technol.

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Cyclic desulfurization−regeneration−denitrification based on metal-free carbon materials is one of the most promising ways to remove NO x and SO 2 simultaneously. However, the impact of S-doping induced by the cyclic desulfurization and regeneration (C-S−R) process on the selective catalytic reduction (SCR) is not well understood. Herein, it is demonstrated that the C-S−R process at 500 °C induces in situ S-doping with a significant accumulation of C−S−C structures. NO x conversion was dramatically enhanced from 18.95% of the original sample to 84.55% of the S-doped sample. Density functional theory calculations revealed that the C−S−C structure significantly regulates the electronic structure of the C atom adjacent to the ketonic carbonyl group, thereby significantly altering the NH 3 adsorption configuration with superior adsorption capacity. Moreover, Sdoping induces an extra electron transfer between the N atom of the NH 3 molecule and the C atom of the carbon plane, thereby promoting the activation of NH 3 over the ketonic carbonyl group with a reduced energy barrier. This study elucidates a synergetic promotional mechanism between the ketonic carbonyl group and the C− S−C structure for SCR, offering a novel design strategy for high-performance heteroatom-doped carbon catalysts in industrial applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In Situ S-Doping Engineering for Highly Efficient NH₃–SCR over Metal-Free Carbon Catalysts: A Novel Synergetic Promotional Mechanism

Zhu,

Yuan,

Peng

et al. 2023

Environ. Sci. Technol.

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“…The regeneration mainly removes the adsorbed pollutants through desorption and decomposition to restore the adsorption capacity of activated carbon. , The choice of regeneration technology is closely related to the type and characteristics of adsorbed substances. − Research by Guilane and Hamdaoui reported that low-frequency ultrasonication could desorb 4-chlorophenol with a stable structure in EAC from petroleum and pharmaceutical wastewater and the regenerated activated carbon do not differ significantly with the virgin carbon . Liu et al investigated that the magnesium sulfate with a low melting point deposited on Mn-based EAC from coal-fired flue gas is decomposed under 650 °C thermal regeneration and the specific surface area is 800 m 2 /g .…”

Section: Introductionmentioning

confidence: 99%

Effect of Na₂CO₃, HF, and CO₂ Treatment on the Regeneration of Exhausted Activated Carbon Used in Sintering Flue Gas

et al. 2021

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The method of continuous treatment with Na 2 CO 3 solution, HF solution, and CO 2 was proposed for the regeneration of the exhausted activated carbon (EAC) produced in the sintering flue gas purification process. In order to obtain the optimal operation conditions, the effect of key parameters such as Na 2 CO 3 solution concentration, HF solution concentration, and CO 2 activation temperature on the sulfur conversion rate and regeneration efficiency was analyzed. Also, the N 2 adsorption, Brunauer−Emmett−Teller analysis, scanning electron microscopy-energy dispersive spectrometry, X-ray diffraction, X-ray fluorescence, and Fourier transform infrared spectroscopy were adopted to investigate the deactivation reason and the change of the physical−chemical properties. The results showed that the deactivated EAC was mainly due to the deposition of inorganic compounds such as CaSO 4 , SiO 2 , and KCl to block the pores. Continuous treatment with Na 2 CO 3 solution and HF solution could remove the inorganic compounds effectively. CO 2 activation treatment further developed the blocked porosity and decreased the surface acidity. The optimal conditions for the regeneration of EAC were a Na 2 CO 3 concentration of 0.5 mol/L, an HF concentration of 0.8 mol/L, and a CO 2 activation temperature of 1073 K with the activation time of 1 h, corresponding to the specific surface area of 607.91m 2 /g. In the fourth regeneration cycle, the adsorption performance during the successive adsorption− regeneration process could still maintain a high level and the regeneration efficiency was 95.31%.

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Reaction intermediates and products characterisation of NH3 in desulphurisation with activated coke

Zhang,

Wang,

et al. 2024

J. Iron Steel Res. Int.

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The study on continuous denitrification, desulfurization of pyrolusite/activated coke hybrid catalyst

Abstract: The SO2 removal and regeneration of ACP improved its NO removal activity, while the denitrification had almost no effect on the desulfurization. The metal sulfate of ACP-Rn showed catalytic activity for NO reduction although there is also a reverse effect.

Cited by 7 publications

References 39 publications

In Situ S-Doping Engineering for Highly Efficient NH₃–SCR over Metal-Free Carbon Catalysts: A Novel Synergetic Promotional Mechanism

In Situ S-Doping Engineering for Highly Efficient NH₃–SCR over Metal-Free Carbon Catalysts: A Novel Synergetic Promotional Mechanism

Effect of Na₂CO₃, HF, and CO₂ Treatment on the Regeneration of Exhausted Activated Carbon Used in Sintering Flue Gas

Reaction intermediates and products characterisation of NH3 in desulphurisation with activated coke

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The study on continuous denitrification, desulfurization of pyrolusite/activated coke hybrid catalyst

Abstract: The SO2 removal and regeneration of ACP improved its NO removal activity, while the denitrification had almost no effect on the desulfurization. The metal sulfate of ACP-Rn showed catalytic activity for NO reduction although there is also a reverse effect.

Cited by 7 publications

References 39 publications

In Situ S-Doping Engineering for Highly Efficient NH3–SCR over Metal-Free Carbon Catalysts: A Novel Synergetic Promotional Mechanism

In Situ S-Doping Engineering for Highly Efficient NH3–SCR over Metal-Free Carbon Catalysts: A Novel Synergetic Promotional Mechanism

Effect of Na2CO3, HF, and CO2 Treatment on the Regeneration of Exhausted Activated Carbon Used in Sintering Flue Gas

Reaction intermediates and products characterisation of NH3 in desulphurisation with activated coke

Contact Info

Product

Resources

About

In Situ S-Doping Engineering for Highly Efficient NH₃–SCR over Metal-Free Carbon Catalysts: A Novel Synergetic Promotional Mechanism

In Situ S-Doping Engineering for Highly Efficient NH₃–SCR over Metal-Free Carbon Catalysts: A Novel Synergetic Promotional Mechanism

Effect of Na₂CO₃, HF, and CO₂ Treatment on the Regeneration of Exhausted Activated Carbon Used in Sintering Flue Gas