Hollow ZSM-5 zeolite encapsulated Ag nanoparticles for SO2-resistant selective catalytic oxidation of ammonia to nitrogen

Zhong, Wang; Sun, Qiang; Wang, Da; Hong, Zhe; Qu, Zhenping; Li, Xuebing

doi:10.1016/j.seppur.2018.09.045

Cited by 129 publications

(32 citation statements)

References 53 publications

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“…Two deconvolution components located around 367.5 and 373.5 eV (Δ = 6 eV) are ascribed to Ag 3d 5/2 and Ag 3d 3/2 , respectively, confirming the presence of the Ag + ion. Two deconvolution components identified around 368.4 and 374.4 eV (Δ = 6 eV) are due to the presence of Ag 0 that can be attributed to the surface coating of Ag nanoparticles on the materials. − The Se 3d high-resolution spectra in the range of 70–52 eV are shown in Figure SI-3a–d. The Se 3d peak has overlapping spin–orbit components (Δ = 0.86 eV, intensity ratio = 0.735).…”

Section: Resultsmentioning

confidence: 99%

Structure, Photoluminescence Emissions, and Photocatalytic Activity of Ag₂SeO₃: A Joint Experimental and Theoretical Investigation

et al. 2021

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In this paper, we report the synthesis of silver selenite (Ag2SeO3) by different methods [sonochemistry, ultrasonic probe, coprecipitation, and microwave-assisted hydrothermal methods]. These microcrystals presented a structural long-range order as confirmed by X-ray diffraction (XRD) and Rietveld refinements and a structural short-range order as confirmed by Fourier transform infrared (FTIR) and Raman spectroscopies. X-ray photoelectron spectroscopy (XPS) provided information about the surface of the samples indicating that they were pure. The microcrystals presented different morphologies and sizes due to the synthesis method as observed by field emission scanning electron microscopy (FE-SEM). The optical properties of these microcrystals were evaluated by ultraviolet–visible (UV–vis) spectroscopy and photoluminescence (PL) measurements. Thermal analysis confirmed the temperature stability of the as-synthetized samples. Further trapping experiments prove that the holes and hydroxyl radicals, to a minor extent, are responsible for the photocatalytic reactions. The experimental results are sustained by first-principles calculations, at the density functional theory (DFT) level, to decipher the structural parameters, electronic properties of the bulk, and surfaces of Ag2SeO3. By matching the experimental FE-SEM images and theoretical morphologies, we are capable of finding a correlation between the morphology and photocatalytic activity, along with photodegradation of the Rhodamine B dye under UV light, based on the different numbers of unsaturated superficial Ag and Se cations (local coordination, i.e., clusters) of each surface.

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Section: Resultsmentioning

confidence: 99%

Structure, Photoluminescence Emissions, and Photocatalytic Activity of Ag₂SeO₃: A Joint Experimental and Theoretical Investigation

et al. 2021

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“…A higher stability in subsequent catalytic runs revealed (9.9 wt.%)Ag/ZSM-5 with the postsynthetic modified support. The micro-/mesoporous structure could prevent sintering and/or leaching of Ag particles during NH 3 -SCO [83].…”

Section: Ag-based Catalystsmentioning

confidence: 99%

Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH3-SCO)

Jabłońska

2021

Molecules

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A recent development for selective ammonia oxidation into nitrogen and water vapor (NH3-SCO) over noble metal-based catalysts is covered in the mini-review. As ammonia (NH3) can harm human health and the environment, it led to stringent regulations by environmental agencies around the world. With the enforcement of the Euro VI emission standards, in which a limitation for NH3 emissions is proposed, NH3 emissions are becoming more and more of a concern. Noble metal-based catalysts (i.e., in the metallic form, noble metals supported on metal oxides or ion-exchanged zeolites, etc.) were rapidly found to possess high catalytic activity for NH3 oxidation at low temperatures. Thus, a comprehensive discussion of property-activity correlations of the noble-based catalysts, including Pt-, Pd-, Ag- and Au-, Ru-based catalysts is given. Furthermore, due to the relatively narrow operating temperature window of full NH3 conversion, high selectivity to N2O and NOx as well as high costs of noble metal-based catalysts, recent developments are aimed at combining the advantages of noble metals and transition metals. Thus, also a brief overview is provided about the design of the bifunctional catalysts (i.e., as dual-layer catalysts, mixed form (mechanical mixture), hybrid catalysts having dual-layer and mixed catalysts, core-shell structure, etc.). Finally, the general conclusions together with a discussion of promising research directions are provided.

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“…Nowadays, more and more pollutants have attracted the attention (Wang et al 2019a;Wang et al 2019b;Wang et al 2020;Zhang et al 2019;Zhang et al 2020a;Zhang et al 2020b;Zhou et al 2019). Among them, the perfluorinated compounds (PFCs), as a persistent organic pollutant, is investigated by more and more researchers.…”

Section: Introductionmentioning

confidence: 99%

Highly effective adsorption removal of perfluorooctanoic acid (PFOA) from aqueous solution using calcined layer-like Mg-Al hydrotalcites nanosheets

Yang

Zheng

et al. 2020

Environ Sci Pollut Res

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To study the influence factors of calcined layer-like Mg-Al hydrotalcites nanosheets adsorbing perfluorooctanoic acid (PFOA) in aqueous solution, Mg-Al hydrotalcite (HMA) nanosheets were prepared by one-step hydrothermal synthesis. The effect of calcination temperature on adsorption properties and structure of HMA (CHMA-x, x means different calcination temperature) was investigated. The prepared samples were systematically characterized by the Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), X-ray diffraction (XRD), scanning electronic microscopy (SEM), and nitrogen adsorptiondesorption isotherms. The adsorption isotherms and kinetics showed the adsorption equilibrium reached within 2 h, and the factors, such as adsorption dosage, pH, and cycles were investigated. It was found that CHMA with 600°C displayed a uniformly morphology, higher surface area about 106.3 m 2 /g, and excellent adsorption properties (1969 mg/g). The equilibrium adsorption data perfectly fitted to the pseudo-second-order kinetic model (R 2 = 0.999) and the Freundlich model (R 2 = 0.994). The main mechanism of CHMA adsorbing PFOA might be the "memory effect." This study provided a new insight to prepare highly effective adsorbents in water treatment.

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Hollow ZSM-5 zeolite encapsulated Ag nanoparticles for SO2-resistant selective catalytic oxidation of ammonia to nitrogen

Cited by 129 publications

References 53 publications

Structure, Photoluminescence Emissions, and Photocatalytic Activity of Ag₂SeO₃: A Joint Experimental and Theoretical Investigation

Structure, Photoluminescence Emissions, and Photocatalytic Activity of Ag₂SeO₃: A Joint Experimental and Theoretical Investigation

Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH3-SCO)

Highly effective adsorption removal of perfluorooctanoic acid (PFOA) from aqueous solution using calcined layer-like Mg-Al hydrotalcites nanosheets

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Hollow ZSM-5 zeolite encapsulated Ag nanoparticles for SO2-resistant selective catalytic oxidation of ammonia to nitrogen

Cited by 129 publications

References 53 publications

Structure, Photoluminescence Emissions, and Photocatalytic Activity of Ag2SeO3: A Joint Experimental and Theoretical Investigation

Structure, Photoluminescence Emissions, and Photocatalytic Activity of Ag2SeO3: A Joint Experimental and Theoretical Investigation

Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH3-SCO)

Highly effective adsorption removal of perfluorooctanoic acid (PFOA) from aqueous solution using calcined layer-like Mg-Al hydrotalcites nanosheets

Contact Info

Product

Resources

About

Structure, Photoluminescence Emissions, and Photocatalytic Activity of Ag₂SeO₃: A Joint Experimental and Theoretical Investigation

Structure, Photoluminescence Emissions, and Photocatalytic Activity of Ag₂SeO₃: A Joint Experimental and Theoretical Investigation