Clean production of porous-Al(OH)3 from fly ash

Shi, Yan; Jiang, Ke; Zhang, Ting‐an; Guo, Junming; Zhao, Aichun

doi:10.1016/j.jhazmat.2020.122371

Cited by 19 publications

(5 citation statements)

References 51 publications

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“…En años recientes, ha estado siendo de interés científico la obtención de Al(OH)3 a partir de residuos inorgánicos (Shi et al, 2020) (García-Mayorga et al, 2018. Se han propuesto métodos de electrólisis para la extracción de Al(OH)3 poroso a partir de cenizas volantes, obteniendo productos electrolíticos con una pureza de 86.43 % en masa de Al(OH)3, y otras impurezas como Ca, Fe y SO3.…”

Section: Introductionunclassified

“…Se han propuesto métodos de electrólisis para la extracción de Al(OH)3 poroso a partir de cenizas volantes, obteniendo productos electrolíticos con una pureza de 86.43 % en masa de Al(OH)3, y otras impurezas como Ca, Fe y SO3. (Shi et al, 2020). En otro trabajo García-Mayorga et al, obtuvieron Al(OH)3 empleando técnicas de electrosíntesis catódica en corriente continua, obteniendo principalmente una fase de bayerita cristalina (García-Mayorga et al, 2018).…”

Section: Introductionunclassified

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Bohemita de tamaño micrométrico obtenida a partir de desechos urbanos

Ibarra-Cruz,

Legorreta-García,

Juárez-Tapia

et al. 2024

ICBI

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En este trabajo se investigó la obtención de hidróxido de aluminio mediante la lixiviación de chatarra de aluminio en una solución alcalina de NaOH. Se realizaron dos precipitaciones a diferentes valores de pH. En la primera precipitación se separaron las impurezas de la chatarra de aluminio; en la segunda precipitación se obtuvieron partículas de hidróxido de aluminio de tamaño micrométrico. Se demostró que los diagramas de equilibrio químico son útiles para explicar la formación de diferentes especies químicas durante el tratamiento de la chatarra de aluminio, incluyendo especies químicas sólidas, iónicas y acuosas. Las especies químicas sólidas, mayoritariamente impurezas, se separaron mediante filtración, mientras que las iónicas y acuosas se utilizaron para producir una solución de hidróxido de aluminio. Las partículas de hidróxido de aluminio de tamaño micrométrico se obtuvieron mediante la neutralización de la solución, seguida de la separación y el secado. La superficie específica de los polvos fue de 69.83 m2/g, resultados acordes con los resultados del análisis cristalográfico. Estos resultados sugieren que este proceso podría ser una forma eficaz de producir partículas de hidróxido de aluminio de tamaño micrométrico a partir de un desecho urbano.

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Section: Introductionunclassified

Bohemita de tamaño micrométrico obtenida a partir de desechos urbanos

Ibarra-Cruz,

Legorreta-García,

Juárez-Tapia

et al. 2024

ICBI

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“…[5][6][7] Therefore, it has been recycled in several elds, such as enhancing the quality of concrete and ceramic, supporting catalyst process, and producing adsorbents. 3,[8][9][10] However, a tremendous amount of FA has been produced from power stations, suggesting larger amount of waste. At present, dumping at a landll and storing in open areas are primary disposal methods for this waste.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the removal efficiency of methylene blue in water by fly ash via a modified adsorbent with alkaline thermal hydrolysis treatment

Dinh¹,

Vo²,

Tran³

et al. 2021

RSC Adv.

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“…In China, about 67% of FA is used in various industries. The remaining FA is mostly disposed of under the dams during construction, threatening living organisms [16]. Thus, a safe and cost-effective technique is vital to utilize excess FA.…”

Section: Introductionmentioning

confidence: 99%

A Study on Mn-Fe Catalysts Supported on Coal Fly Ash for Low-Temperature Selective Catalytic Reduction of NOX in Flue Gas

et al. 2020

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A series of Mn0.15Fe0.05/fly-ash catalysts have been synthesized by the co-precipitation method using coal fly ash (FA) as the catalyst carrier. The catalyst showed high catalytic activity for low-temperature selective catalytic reduction (LTSCR) of NO with NH3. The catalytic reaction experiments were carried out using a lab-scale fixed-bed reactor. De-NOx experimental results showed the use of optimum weight ratio of Mn/FA and Fe/FA, resulted in high NH3-SCR (selective catalytic reduction) activity with a broad operating temperature range (130–300 °C) under 50000 h−1. Various characterization methods were used to understand the role of the physicochemical structure of the synthesized catalysts on their De-NOx capability. The scanning electron microscopy, physical adsorption-desorption, and X-ray photoelectron spectroscopy showed the interaction among the MnOx, FeOx, and the substrate increased the surface area, the amount of high valence metal state (Mn4+, Mn3+, and Fe3+), and the surface adsorbed oxygen. Hence, redox cycles (Fe3+ + Mn2+ ↔ Mn3+ + Fe2+; Fe2+ + Mn4+ ↔ Mn3+ + Fe3+) were co-promoted over the catalyst. The balance between the adsorption ability of the reactants and the redox ability can promote the excellent NOx conversion ability of the catalyst at low temperatures. Furthermore, NH3/NO temperature-programmed desorption, NH3/NO- thermo gravimetric-mass spectrometry (NH3/NO-TG-MS), and in-situ DRIFTs (Diffuse Reflectance Infrared Fourier Transform Spectroscopy) results showed the Mn0.15Fe0.05/FA has relatively high adsorption capacity and activation capability of reactants (NO, O2, and NH3) at low temperatures. These results also showed that the Langmuir–Hinshelwood (L–H) reaction mechanism is the main reaction mechanism through which NH3-SCR reactions took place. This work is important for synthesizing an efficient and environmentally-friendly catalyst and demonstrates a promising waste-utilization strategy.

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Clean production of porous-Al(OH)3 from fly ash

Cited by 19 publications

References 51 publications

Bohemita de tamaño micrométrico obtenida a partir de desechos urbanos

Bohemita de tamaño micrométrico obtenida a partir de desechos urbanos

Enhancing the removal efficiency of methylene blue in water by fly ash via a modified adsorbent with alkaline thermal hydrolysis treatment

A Study on Mn-Fe Catalysts Supported on Coal Fly Ash for Low-Temperature Selective Catalytic Reduction of NOX in Flue Gas

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