Quantitative Study of the Adsorption of Aromatic Hydrocarbons (Benzene, Toluene, and <i>p</i>-Xylene) on Dealuminated Clinoptilolites

Hernández, Miguel Ángel; Corona, L.; González, Ana Isabel; Rojas, Fernando; Lara, V.H.; Silva, F.

doi:10.1021/ie049276w

Cited by 41 publications

(37 citation statements)

References 27 publications

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“…Esta curvatura también puede ser relacionada al fenómeno de multicapas de adsorción que se esta realizando en los mesoporos y área externa de la zeolita. En esta isoterma de alta resolución se observan los distintos mecanismos de adsorción que ocurren en la adsorción de N 2 a 76 K. [18]. En los gráficos  s se consideró el intervalo comprendido entre 0.05 a 2.4, figura 7a y de 0.05-0.4 para los gráficos de alta resolución, figura 7b.…”

Section: Adsorción De Nitrógenounclassified

Propiedades de adsorción en zeolitas con anillos de 8 miembros: I. microporosidad y superficie externa

Corona

Hernández

et al. 2009

Matéria (Rio J.)

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RESUMENEn este trabajo se reporta la síntesis de zeolita LTA y sus posteriores intercambios iónicos con distintas sales inorgánicas. De manera adicional se reportan datos experimentales sobre la estimación del área externa en zeolita LTA intercambiada usando el método t. La caracterización físico-química de estas zeolitas es abordada a través de métodos de Difracción de Rayos X (DRX), Microscopía Electrónica de Barrido (SEM), Espectroscopía de Infrarrojo (IR) y Adsorción de N 2 a 76 K. La zeolita LTA fue sintetizada hidrotérmicamente partiendo de una mezcla compuesta por hidróxido de sodio, aluminato de sodio y silicato de sodio en las relaciones estequiométricas requeridas. Posteriormente se le realizó un intercambió iónico con nitrato de plata y sales en forma de cloruros de K, Ca, Cd, Zn, Cu, y Mn. La zeolita intercambiada con cationes bivalentes, presentó mejores propiedades para la adsorción de nitrógeno. Los espectros de rayos X de la zeolita matriz y de aquella intercambiada mostraron buena cristalinidad. La microscopía electrónica de barrido mostró la presencia de un gran número de cristales definidos y biselados. El estudio de caracterización de textura de la zeolita intercambiada con las distintas sales mencionadas mediante la adsorción de nitrógeno a 76 K mostró que es posible obtener substratos de zeolita LTA que desarrollen altas porosidades. La mayoría de los microporos de estos materiales son supermicroporos (huecos entre 0.7 y 2 nm). El valor de la microporosidad determinada por el método  de Sing para la muestra intercambiada con Ca, revela que los microporos contenidos en la zeolita incluyen ultramicroporos y supermicroporos, en los cuales se lleva a cabo el llenado primario y secundario respectivamente.Palabras clave: microporos, zeolitas, área externa, zeolita LTA, adsorción. Adsorption properties in zeolites containing 8-membered rings I. Microporosity and external surface area ABSTRACTIn this work synthesis of LTA zeolite and its ionic exchange with inorganic chemical salts were studied. Likewise experimental results are reported about LTA zeolite external surface area by using the t-plot method. Physicochemical characterization of this zeolite was carried out by XRD, SEM, IR and nitrogen adsorption (76 K) techniques. LTA zeolite was synthesized hydrothermally starting from a hydrogel mixture composed by NaOH, Na[Al(OH)4] and Na2SiO4 in stoichiometric amounts determined by its crystallization field. An ion exchange was carried out in LTA zeolite with AgNO3, KCl, CaCl2, CdCl2, ZnCl2, CuCl2 and MnCl2 (0.1 N for

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Section: Adsorción De Nitrógenounclassified

Propiedades de adsorción en zeolitas con anillos de 8 miembros: I. microporosidad y superficie externa

Corona

Hernández

et al. 2009

Matéria (Rio J.)

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“…The zeolite was modified to enhancing the adsorption of VOCs. As described by Hernandez et al (2005), it was two times washed by 1 N HCl for 6 h at 50°C with a moderate shaking and then rinsed several times by distilled water. Finally, the zeolite grains were dried at 180°C (Hernandez et al, 2005).…”

Section: Materials and Methods Preparation Of The Bedsmentioning

confidence: 99%

“…This study has focused on comparison of the BTXs elimination and mineralization on Fe 0 , Cu 2 O and Fe 0 -Cu 2 O nanoparticles coated zeolite bed. Previous studies showed adsorption of VOCs on natural zeolites such as clinoptilolite; for instance, Hernandez et al (2005) showed the BTXs adsorption on clinoptilolite and they found that dealumination of the zeolite increases its adsorption capability for BTXs (Hernandez et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

BTXs Removal with Transition Metals Coated Beds, Considering the Plausible Reaction Mechanisms

Rostami¹,

Jafari²

2015

J. of Environmental Science and Technology

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In this study, a natural zeolite (i.e., Clinoptilolite) was used as bed of a lab scale packed tower. The bed was coated with two transition metals nano-scale particles (i.e., Fe 0 and Cu 2 O). Each coated metal to bed ratio was 4.6 wt.% and the experiments were conducted in air flow of 1 L minG 1 and temperature of 200°C. The results showed up to 83.83% of BTX (benzene, toluene and xylene) removal for Fe 0 and respectively 32.0 and 56.98% for Cu 2 O and combined Fe 0 -Cu 2 O coated beds. However, the pollutants mineralization/elimination ratio on the combined metals coated bed, with up to 0.83, was greater than the remains which were 0.58 and 0.37 in order for Fe 0 and Cu 2 O coated beds.

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“…The increase of temperature favors this adsorption to occur more easily given that the activation energy can be surmounted more readily. In the case of benzene (C 6 H 6 ), the smaller size of the molecule leads to easy adsorption without need of large activation energies, this reflects the fact that the kinetic diameter of C 6 H 6 molecule is smaller than those of toluene and o-xylene [17].…”

Section: Equilibrium Isothermsmentioning

confidence: 99%

Adsorption-Desorption of BTX (Benzene, Toluene and O-xylene) on Fe, Fe-Al Pillared Clay

Mèçabih¹

2017

JEAS

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The studies are conducted in laboratory to determine the adsorption-desorption behavior of BTX (benzene, toluene and o-xylene) in gas phase on Fe, Fe-Al pillared clays adsorbents. In experimental conditions of constant atmospheric pressure, initial concentrations with an increasing volume (0.5 -2 ml) injected benzene (2.25), toluene (1.89) and o-xylene (1.66) μmol/L at T (40˚C, 60˚C and 80˚C), and the adsorption increases with increase of temperature, indicating that the adsorption process would be a chemical adsorption rather than physical one. The results are shown that the BTX adsorption data fitted very well (R 2 > 0.

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Quantitative Study of the Adsorption of Aromatic Hydrocarbons (Benzene, Toluene, and p-Xylene) on Dealuminated Clinoptilolites

Cited by 41 publications

References 27 publications

Propiedades de adsorción en zeolitas con anillos de 8 miembros: I. microporosidad y superficie externa

Propiedades de adsorción en zeolitas con anillos de 8 miembros: I. microporosidad y superficie externa

BTXs Removal with Transition Metals Coated Beds, Considering the Plausible Reaction Mechanisms

Adsorption-Desorption of BTX (Benzene, Toluene and O-xylene) on Fe, Fe-Al Pillared Clay

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