Novel fabrication of a sepiolite supported cobalt-based catalyst via a coprecipitation-reduction method

Wang, Fei; Ding, Youpeng; Hao, Min; Fang, Baizeng; Liang, Jinsheng; Zhang, Tingting; Gao, Peizhang; Zhang, Hui

doi:10.1016/j.clay.2020.105909

Cited by 15 publications

(7 citation statements)

References 35 publications

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“…Furthermore, Wang et al developed some composites with related performance including tourmaline-modified FeMnTiO x (Wang et al 2019a) and a novel clay supported cobalt-based catalyst through a coprecipitation-reduction method (Wang et al 2021). Additionally, they identified Zr promotion effects in atomic scale for Co-based catalysts in Fischer-Tropsch synthesis through multiple technologies (Piao et al 2020).…”

Section: Treatment Of Microplastic Pollutionmentioning

confidence: 99%

Analytical methods for microplastics in the environment: a review

2022

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Microplastic pollution is a recently discovered threat to ecosystems requiring the development of new analytical methods. Here, we review classical and advanced methods for microplastic analysis. Methods include visual analysis, laser diffraction particle, dynamic light scattering, scanning electron microscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, thermal analysis, mass spectrometry, aptamer and in vitro selection, and flow cytometry.

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Section: Treatment Of Microplastic Pollutionmentioning

confidence: 99%

Analytical methods for microplastics in the environment: a review

2022

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“…0.4 nm × 1 nm), it can be generated by the penetration of organic and inorganic cations. The sepiolite surface has many silanol (Si-OH) groups as a result of a discontinued silica sheet on the outer 2:1 layers [226][227][228][229] (Figures 6 and 7). On the sepiolite structure, three modification/adsortion zones are distinguished: Si-OH groups along the component fiber axis; oxygen ions on the tetrahedric silica layers; and a few cationic exchange gaps.…”

Section: Sepiolitementioning

confidence: 99%

Uses of Nanoclays and Adsorbents for Dye Recovery: A Textile Industry Review

et al. 2021

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Wastewater recovery is one of the most pressing contaminant-related subjects in the textile industry. Many cleaning and recovery techniques have been applied in recent decades, from physical separation to chemical separation. This work reviews textile wastewater recovery by focusing on natural or synthetic nanoclays in order to compare their capabilities. Presently, a wide variety of nanoclays are available that can adsorb substances dissolved in water. This review summarizes and describes nanoclay modifications for different structures (laminar, tubular, etc.) to compare adsorption performance under the best conditions. This adsorbent capacity can be used in contaminant industries to recover water that can be used and be recontaminated during a second use to close the production circle. It explores and proposes future perspectives for the nanoclay hybrid compounds generated after certain cleaning steps. This is a critical review of works that have studied adsorption or desorption procedures for different nanoclay structures. Finally, it makes a future application proposal by taking into account the summarized pros and cons of each nanoclay. This work addresses contaminant reuse, where part of the employed dyes can be reused in printing or even dyeing processes, depending on the fixing capacity of the dye in the nanoclay, which is herein discussed.

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“…Over the past decade, many advances have been made in the study of composite materials, which play important roles in the environmental fields. − In recent years, extensive research has been devoted to small-pore zeolite SCR catalysts mostly caused by their remarkable NH 3 -SCR performance, hydrothermal stability, and excellent resistance against hydrocarbon poisoning. − Cu-CHA materials, especially Cu-SSZ-13, are considered as the best commercialized SCR catalysts, with the ability to meet the increasingly stringent emission regulations . As research on small-pore zeolites continues, some alternative small-pore zeolites have been developed.…”

Section: Introductionmentioning

confidence: 99%

Si/Al Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO₂

Sun

Shan

et al. 2022

Environ. Sci. Technol.

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A comparative study was performed to investigate the NH3-selective catalytic reduction (SCR) reaction activity of Cu-SSZ-13 zeolites having Si/Al ratios (SARs) of 5, 18, and 30. Remarkably, the Cu-SSZ-13 zeolite catalysts exhibited completely opposite behaviors as a function of SAR under standard SCR (SSCR) and fast SCR (FSCR) reaction atmospheres. Under SSCR conditions, the NO x conversion increased as expected with the decreasing SAR. Under FSCR conditions, however, the NO x conversion decreased as the SAR decreased, contrary to expectations. In this study, based on characterization of the catalysts by X-ray diffraction, transmission electron microscopy, electron paramagnetic resonance, H2-temperature-programmed reduction, temperature-programmed desorption, and diffuse reflectance infrared Fourier transform spectroscopy, together with theoretical calculations, the authors found that the amount of Brønsted acid sites goes up while the SAR goes down, leading to an increase in the accumulation of NH4NO3 under FSCR reaction conditions. Moreover, the accumulated NH4NO3 is of greater stability for those low SAR Cu-SSZ-13 catalysts. These two reasons cause the FSCR performance of Cu-SSZ-13 to decrease with a decrease in SAR. As a result, the NO2 effect on SCR activity changes from promotion to inhibition as the SAR decreases.

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Novel fabrication of a sepiolite supported cobalt-based catalyst via a coprecipitation-reduction method

Cited by 15 publications

References 35 publications

Analytical methods for microplastics in the environment: a review

Analytical methods for microplastics in the environment: a review

Uses of Nanoclays and Adsorbents for Dye Recovery: A Textile Industry Review

Si/Al Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO₂

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Novel fabrication of a sepiolite supported cobalt-based catalyst via a coprecipitation-reduction method

Cited by 15 publications

References 35 publications

Analytical methods for microplastics in the environment: a review

Analytical methods for microplastics in the environment: a review

Uses of Nanoclays and Adsorbents for Dye Recovery: A Textile Industry Review

Si/Al Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO2

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Product

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Si/Al Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO₂