Investigation of Cu/Zn/Ag/Mo-based impregnated activated carbon for the removal of toxic gases, synthesized in aqueous media

Kiani, Sidra Shaoor; Farooq, Amjad; Faiz, Yasir; Shah, Attaullah; Ahmad, Masroor; Irfan, Naseem; Iqbal, Muhammad; Usman, Azeem Bin; Mahmood, Asif; Nawaz, Mohsan; Bibi, Saira; Aziz, Azliana

doi:10.1016/j.diamond.2020.108179

Cited by 14 publications

(4 citation statements)

References 30 publications

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“…15 Furthermore, the loading of metal oxides promotes the conversion of NO to N 2 , thereby increasing the adsorption capacity. 16 As the loading of metal oxides on the catalyst support increases, the breakthrough time initially increases and then decreases. For AC-1, which has a relatively low metal content, the influence on NO adsorption performance is weak, resulting in a relatively short breakthrough time of 2521 s. With an increase in the metal content on the support, the prepared catalyst exhibits enhanced NO adsorption performance, as shown in Figure 1a and Table 3.…”

Section: Results and Analysismentioning

confidence: 99%

“…Subsequent thermal treatment allows these metal ions to deposit and undergo oxidation on the AC, resulting in the formation of metal oxide particles within the AC pores, thereby creating space within the pores and facilitating the formation of the catalyst’s pore structure . Furthermore, the loading of metal oxides promotes the conversion of NO to N 2 , thereby increasing the adsorption capacity . As the loading of metal oxides on the catalyst support increases, the breakthrough time initially increases and then decreases.…”

Section: Results and Analysismentioning

confidence: 99%

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Surface Effects of Trace CuMnCe Loading on Coal-Based Carbon Materials and Mechanisms of NO_x Adsorption and Removal

Han,

Shao,

Wang

et al. 2023

Energy Fuels

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This study employed the water-thermal coupled high-temperature CO2 gasification method using Zhundong coal as the raw material to prepare porous carbon materials. A dual-function catalyst for NO x adsorption and reduction was prepared by loading Cu, Mn, and Ce components onto the carbon material through hydrothermal impregnation. The influence of metal loading content on the pore structure, surface functional groups, and synergistic effects between metals in the carbon-based catalyst was investigated during the preparation process. In the process of NO x removal using carbon-based catalysts, the primary components comprise two distinct phases: NO x adsorption and CO-SCR experiments. The experimental sequence involves the initial execution of NO x adsorption tests, succeeded by subsequent reduction treatments. These processes are undertaken systematically to comprehensively investigate the attributes of the catalyst. The physical and chemical parameters of the samples were characterized using XRD, Raman, H2-TPR, NO x -TPD, and other techniques. Finally, the NO x adsorption and reduction mechanism of representative samples were deeply analyzed using in situ DRIFTS. The results showed that when the loading amounts of Cu, Mn, and Ce were 0.006, 0.012, and 0.003 g, respectively, the pore structure of the catalyst was excellent, with a NO x adsorption performance (q e) of 16.23 mg/g, and the NO conversion rate reached 66% at 200 °C. This is mainly attributed to the enhanced interaction between metal species on the catalyst surface by optimizing the metal content on the carbon support, which promotes the dissociation of NO in the NO + CO reaction. In situ DRIFTS results confirmed that NO and CO adsorb on the catalyst surface, and CO* reacts with NO* to produce N2 and CO2, following the Langmuir–Hinshelwood mechanism.

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Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

Surface Effects of Trace CuMnCe Loading on Coal-Based Carbon Materials and Mechanisms of NO_x Adsorption and Removal

Han,

Shao,

Wang

et al. 2023

Energy Fuels

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“…However, these carbons frequently had poor physicochemical properties; as a result, this technology could be used only at low space velocity with dry flue gas. , To expand the application conditions and improve the material properties, researchers began to investigate methods of activating carbon. Activation methods can be classified into the following types: (1) optimizing the pore structure and enhancing its catalytic role by metal doping; − (2) increasing the surface-active functional groups by impregnation with N, Si, O, and so forth; , and (3) precise control of the activation process, including the use of multiple sections with optimized temperatures and atmosphere optimization (adding CO 2 or water vapor to the activation atmosphere). ,,, These activation processes are crucial for increasing the adsorption volume of SO 2 or NO x . In addition, incorporating metal oxides can enhance the catalytic activity of carbon-based materials …”

Section: Introductionmentioning

confidence: 99%

“…At the latter type active sites, the adsorbed NO was oxidized and subsequently migrated onto adjacent sites by spillover and/or desorption and re-adsorption processes in the presence of atmospheric O 2 . Kiani et al 6 impregnated activated carbon with aqueous Cu, Zn, Ag, and Mo solutions and obtained NO 2 breakthrough times that demonstrated that metal loading could significantly increase the NO 2 adsorption volume. This increased adsorption may be due to chemisorption on the impregnated surfaces via the conversion of toxic gases to non-toxic products.…”

Section: Introductionmentioning

confidence: 99%

NO_x Adsorption Mechanism of Coal-Based Activated Carbon Modified with Trace Potassium: In Situ DRIFTS and DFT Study

et al. 2022

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A series of coal-based materials were prepared using a hydrothermal method combined with high-temperature CO2 activation. During sample preparation, K modification was performed to optimize the surface functional groups and pore structure. The NO x adsorption volume of each sample was evaluated in a simulated flue gas atmosphere. The physical and chemical parameters of the samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and temperature-programmed desorption of NO x and NO. In addition, the NO x adsorption mechanism of representative samples was explored by in situ diffuse reflectance infrared Fourier transform spectroscopy and density functional theory calculations. The adsorption capacity of NO x and SO2 with NO x was also systematically investigated using cyclic adsorption and co-adsorption experiments, respectively. The results showed that the optimized KOH concentration is 0.4 g KOH/30 mL H2O. At this concentration, the material had a relatively good pore structure and abundant surface functional groups. The investigation of the mechanism revealed that pore structure optimization is important for increasing the NO x adsorption capacity on the surface of the coal-based materials, followed by functional group and then surface metal optimization. In addition, oxygen-containing active functional groups with moderately high C–O and R2CO contents can enhance the adsorption of NO to some extent. Optimizing the ratio of C–O to R2CO is critical for NO x adsorption. This study is significant for NO x adsorption removal technology.

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Impregnation on activated carbon for removal of chemical warfare agents (CWAs) and radioactive content

Kiani

Farooq

Ahmad

et al. 2021

Environ Sci Pollut Res

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Investigation of Cu/Zn/Ag/Mo-based impregnated activated carbon for the removal of toxic gases, synthesized in aqueous media

Cited by 14 publications

References 30 publications

Surface Effects of Trace CuMnCe Loading on Coal-Based Carbon Materials and Mechanisms of NO_x Adsorption and Removal

Surface Effects of Trace CuMnCe Loading on Coal-Based Carbon Materials and Mechanisms of NO_x Adsorption and Removal

NO_x Adsorption Mechanism of Coal-Based Activated Carbon Modified with Trace Potassium: In Situ DRIFTS and DFT Study

Impregnation on activated carbon for removal of chemical warfare agents (CWAs) and radioactive content

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Investigation of Cu/Zn/Ag/Mo-based impregnated activated carbon for the removal of toxic gases, synthesized in aqueous media

Cited by 14 publications

References 30 publications

Surface Effects of Trace CuMnCe Loading on Coal-Based Carbon Materials and Mechanisms of NOx Adsorption and Removal

Surface Effects of Trace CuMnCe Loading on Coal-Based Carbon Materials and Mechanisms of NOx Adsorption and Removal

NOx Adsorption Mechanism of Coal-Based Activated Carbon Modified with Trace Potassium: In Situ DRIFTS and DFT Study

Impregnation on activated carbon for removal of chemical warfare agents (CWAs) and radioactive content

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Product

Resources

About

Surface Effects of Trace CuMnCe Loading on Coal-Based Carbon Materials and Mechanisms of NO_x Adsorption and Removal

Surface Effects of Trace CuMnCe Loading on Coal-Based Carbon Materials and Mechanisms of NO_x Adsorption and Removal

NO_x Adsorption Mechanism of Coal-Based Activated Carbon Modified with Trace Potassium: In Situ DRIFTS and DFT Study