Co and Fe-catalysts supported on sepiolite: effects of preparation conditions on their catalytic behaviors in high temperature gas flow treatment of dye

Lin, Xiangfeng; Fang, Jian; Chen, Menglin; Huang, Zhi; Chen, Su

doi:10.1007/s11356-016-6631-3

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…In addition, the kinetics of the catalytic degradation of methylene blue over NiO/sepiolite is discussed. The regeneration temperature for the NiO/sepiolite materials was much lower than in our previous work 19 .…”

Section: Introductioncontrasting

confidence: 53%

“…In this study, it is shown that high-temperature gas flow regeneration processes are a promising option, since they are fast processes that are performed in situ within the adsorption column under ambient conditions and at lower temperatures. Our previous report demonstrated that high-temperature gas flow regeneration was an effective process 19 . This technique includes adsorption and high-temperature gas flow regeneration that takes place within a single unit.…”

Section: Introductionmentioning

confidence: 99%

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Recyclable NiO/sepiolite as adsorbent to remove organic dye and its regeneration

Gao

Wang

Huang

et al. 2022

Sci Rep

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In this study, the impregnation synthesis of NiO/sepiolite and its application for dye removal during wastewater treatment is introduced. The NiO/sepiolite materials act as an adsorbent/catalyst. It comprises a unique combination of adsorption and high-temperature gas flow regeneration (the NiO/sepiolite acts as a catalyst at this stage, using regeneration rate as evaluation index of catalytic activity of NiO/sepiolite) in a single unit, in which the NiO/sepiolite was regenerated and reused for the next round adsorption of dye. An aqueous solution of methylene blue was used to evaluate the adsorption and regeneration performance of the adsorbent/catalyst. The regeneration rate reached 74% when the reaction time and temperature were 7 min and 350 °C, respectively. The effects of the regeneration temperature and volume fraction of O2 on the regeneration rate were investigated. And the regeneration reaction kinetics was provided. The combination of adsorptive and catalytic properties in the NiO/sepiolite composites received interesting results for removing refractory biodegradable organic pollutants. This work provides new insights for the removal of dye from wastewater using Ni catalysts supported on natural low-cost clay.

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Section: Introductioncontrasting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Recyclable NiO/sepiolite as adsorbent to remove organic dye and its regeneration

Gao

Wang

Huang

et al. 2022

Sci Rep

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“…22 Our previous work has highlighted the efficiency of the adsorption and hot gas stream regeneration process for dye wastewater treatment. 12,23,24 This gas–solid catalytic reaction refers to a cycle of dye adsorption from aqueous solutions and hot O 2 gas stream regeneration. The regeneration rate of Co–Fe/sepiolite can reach 85.7% at 650 °C within 10 minutes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ce–Ni/sepiolite with excellent adsorption and catalytic oxidation performance toward dyes

et al. 2023

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Hydrogen Production Came from Catalytic Reforming of Volatiles Generated by Waste-Plastic Pyrolysis Over Sepiolite-Based Catalysts

Martín-Lara,

Moreno,

Blázquez

et al. 2024

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Several sepiolite-based catalysts have been prepared and investigated for pyrolytic H2 production from a post-consumer mixture of residual plastics. The experimental installation involved a two-stage reaction system: first, the plastic mixture was thermally pyrolyzed at 500 ºC; then, the generated volatiles were reformed by increasing the temperature to 700 ºC and 800 ºC in the presence of the sepiolite-based catalysts. The real mixture came from non-separate waste collection streams and contained post-consumer polypropylene (rigid and film), expanded polystyrene, high-impact polystyrene, and polyethylene. The results demonstrated that the two-stage pyrolysis technique using sepiolite-based catalysts successfully generated hydrogen. The effects of the type of polymer, temperature, and catalyst were analyzed. The higher production of hydrogen (27.2 mmol H2/g) was obtained when the mixture of plastic waste was pyrolyzed and then the volatiles were reformed at 800 °C with the SN5-800 12 nickel-modified sepiolite. Additionally, the generation of hydrogen also increased after acidifying natural sepiolite (from 18.2 mmol H2/g plastic for natural sepiolite to 26.4 mmol H2/g for acidified sepiolite at 800 ºC with a plastic/catalyst ratio of 1:2). Finally, the carbon deposited in the catalysts was examined. Approximately, only 20% of the carbon that was deposited in the sepiolite-based catalysts was filamentous carbon; the majority was amorphous carbon.The results have therefore shown that it is possible to obtain a hydrogen-rich gas from the reforming of the pyrolysis vapors of a mixture of plastic waste using a low-cost catalyst based on nickel-modified sepiolite.

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Co and Fe-catalysts supported on sepiolite: effects of preparation conditions on their catalytic behaviors in high temperature gas flow treatment of dye

Cited by 7 publications

References 29 publications

Recyclable NiO/sepiolite as adsorbent to remove organic dye and its regeneration

Recyclable NiO/sepiolite as adsorbent to remove organic dye and its regeneration

Synthesis of Ce–Ni/sepiolite with excellent adsorption and catalytic oxidation performance toward dyes

Hydrogen Production Came from Catalytic Reforming of Volatiles Generated by Waste-Plastic Pyrolysis Over Sepiolite-Based Catalysts

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