Adsorption of associating molecules in micropores and application to water on carbon

Talu, Orhan; Meunier, F.

doi:10.1002/aic.690420319

Cited by 110 publications

(114 citation statements)

References 34 publications

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“…3 presenta la isoterma de adsorción de agua en carbón a 21°C para una actividad acuosa entre 0.1-0.9. La isoterma de adsorción exhibe un comportamiento Tipo III de acuerdo con la clasificación de la IUPAC [1,6]. La adsorción se incrementa a medida que aumenta la actividad de agua.…”

Section: Isotermas De Adsorciónunclassified

“…La isoterma de adsorción fue modelada utilizando el modelo propuesto por Talu y Meunier [1]. Este modelo puede ser expresado como una teoría general para la adsorción de moléculas auto-asociativas sobre estructuras sólidas.…”

Section: Isotermas De Adsorciónunclassified

“…La teoría puede explicar el comportamiento de las isotermas Tipo I a Tipo V, incluyendo isotermas tipo III características de adsorbentes no porosos, como es el caso de este trabajo. Los datos de las isotermas son dependientes únicamente en tres parámetros: El inverso de la constante de Henry, la capacidad de saturación y la constante de reacción de formación de "clúster" [1]. El modelo es descrito a continuación:…”

Section: Isotermas De Adsorciónunclassified

“…Altos valores del parámetro H indica menor afinidad de las moléculas de agua en la fase adsorbida. Los sitios activos están en lugares que no son de fácil acceso al agua, valores del parámetro K indican que los sitios primarios están en espacios muy diversos, resultando en un paso ampliado en la isoterma, que comienza a las presiones más bajas [1].…”

Section: Isotermas De Adsorciónunclassified

“…Diferentes isotermas de adsorción de agua fueron obtenidas a 21, 30, 40, y 50°C. Las isotermas fueron descritas fenomenológicamente por el modelo de Talu & Meunier [1] para el entendimiento del comportamiento de moléculas autoasociativas como el agua en carbón. La muestra de carbón considerada en este estudio fue caracterizada utilizando análisis FT-IR, análisis elemental (C-H-N).…”

Section: Introductionunclassified

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Effect of the temperature in adsorption phenomena of water onto Sub-Bituminous coal

2016

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The presence of water in coal presents a technological challenge for its industrial use in energetic processes. Therefore, this study aims to study the temperature effect on the water adsorption onto coals at 21, 30, 40 and 50°C. A Colombian bituminous coal was used as sample. The coal was characterized by nitrogen adsorption at 77 K (SBET), Scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, elemental analysis (C-H-N elemental). The results showed that the water uptake increased as the vapor pressure increased. The Talu and Meunier model [1] was used to fit the adsorption isotherms, and the mean square root error (MSRE%) was lower than 10%. Additionally, the Gibbs free energy was found to have negative values, which corroborates the spontaneous adsorption process.Keywords: Adsorption; Coal; Isotherm; Water Efecto de la temperatura en el proceso de adsorción de agua en Carbón sub-bituminoso colombiano Resumen La presencia de agua en carbones presenta un reto tecnológico para su uso industrial en procesos energéticos. Por tal motivo, este estudio pretende analizar el efecto de temperatura en la adsorción de agua en carbones a 21, 30, 40 y 50°C. Un carbón sub-bituminoso Colombiano fue usado como muestra. El carbón fue caracterizado por adsorción de nitrógeno a 77K (SBET), Microscopía electrónica de barrido (SEM), Espectroscopia infrarroja por transformada de Fourier (FT-IR), análisis elemental (C-H-N). Los resultados muestran que la captura de agua se incrementa a medida que la presión de vapor aumenta. El modelo Talu & Meunier [1] fue utilizado para ajustar las isotermas de adsorción, presentando un buen ajuste. MSRE% menor al 10%. Adicionalmente, se calculó la energía libre de Gibbs obteniendo valores negativos, lo cual corrobora el proceso espontáneo de adsorción.

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Section: Isotermas De Adsorciónunclassified

Section: Introductionunclassified

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Effect of the temperature in adsorption phenomena of water onto Sub-Bituminous coal

2016

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Drying of an Activated Carbon Column after Steam Regeneration

Faqir

Bart³

1999

Chem. Eng. Technol.

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Experiments of the adsorption cycles, which include adsorption, steam desorption, and drying/cooling, are conducted using a well instrumented pilot-scale apparatus with toluene as the sorptive. Special attention can be paid to the temperature profiles and the changes in water and toluene loading during drying since there is the possibility to take samples from inside the column. Water isotherms were gravimetrically determined and correlated with the association theory of Talu and Meunier. The mathematical description of the air drying of the packed bed with activated carbon is based on an equation system with coupled heat and mass transfer between the bed and the fluid. The first calculations show good agreement with experimental results.

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Mechanisms of Water Adsorption on Carbons

et al. 2004

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The properties of water are of importance in many scientific disciplines such as chemistry, biology, geology, nanotechnology, and materials technology. Moreover, the adsorption of water on activated carbon (AC) is an important topic in many different areas of science and technology because water is the most common solvent in nature. The adsorption and phase behavior of polar fluids in carbon pores has been studied extensively, but our understanding of the adsorption of water on carbonaceous materials is still incomplete (1, 2, 3, 4). In recent years, a number of experimental and simulation studies of adsorption of water in pores have appeared in the literature. Some studies have assumed that the adsorption behavior of water in graphite pores is hydrophobic. Although principally hydrophobic adsorbents may contain significant numbers of adsorption centers that can interact with water, it is generally believed that the combination of weak carbon–water dispersive attractions and strong water–water associative interactions are responsible for the complex behavior of water confined in carbonaceous pores.

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Adsorption of associating molecules in micropores and application to water on carbon

Cited by 110 publications

References 34 publications

Effect of the temperature in adsorption phenomena of water onto Sub-Bituminous coal

Effect of the temperature in adsorption phenomena of water onto Sub-Bituminous coal

Drying of an Activated Carbon Column after Steam Regeneration

Mechanisms of Water Adsorption on Carbons

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