Evaluation of the thermodynamic parameters for the adsorption of some hydrocarbons on 4A and 13X zeolites by inverse gas chromatography

Inel, Oğuz

doi:10.1016/s1385-8947(02)00026-8

Cited by 31 publications

(18 citation statements)

References 22 publications

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“…The sequence obtained for the natural bentonite and the bentonite with acid activation is similar to that obtained for silica surfaces and 13X (Milonjic and Kopecni, 1984;İnel et al, 2002), benzene > n-hexane > cyclohexane. But the same sequence wasn't obtained for the bentonite treated with pentanol and Na 2 CO 3 .…”

Section: Isosteric Enthalpies Of Adsorptionsupporting

confidence: 76%

Evaluation of the Thermodynamic Parameters for the Adsorption of Some Hydrocarbons on Chemically Treated-Bentonites by Inverse Gas Chromatography

et al. 2005

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Inverse gas chromatography has been used to evaluate the adsorption parameters ( H a , H st , S a and G a ) of some probe molecules, each representing a class of organic (n-hexane, cyclohexane, benzene, n-octane, 1-octene and isooctane) on bentonite and chemically treated-bentonites. The adsorption parameters of the probes on the bentonite samples were determined in infinite dilution region. Adsorption of the organic species was investigated in the temperature range of 200-275 • C, using a flame ionization detector, and nitrogen as a carrier gas. The net retention volumes (V n ) of the probes were determined by the help of the retention times (t R ) observed on gas chromatograms for each probe. Injection was made at least three times for each probe, obtaining reproducible results of ±0.5%. It was found that benzene exhibits more negative H than for n-hexane and cyclohexane on all of the adsorbents. In addition, it was found that 1-octene exhibits more negative H than for n-octane and isooctane on the chemically treated-bentonites, whereas n-octane exhibits more negative H than for 1-octene and isooctane on the natural bentonite. Also, interactions of benzene with the natural-and chemically treated-bentonites were found to be stronger than those of n-hexane and cyclohexane with the same carbon number. Again, interactions of the 1-octene with the chemically treated-bentonites were found to be stronger those of n-octane and isooctane with the same carbon number. On the contrary, interactions of n-octane with the untreated-bentonite were found to be stronger than those of 1-octene and isooctane.

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Section: Isosteric Enthalpies Of Adsorptionsupporting

confidence: 76%

Evaluation of the Thermodynamic Parameters for the Adsorption of Some Hydrocarbons on Chemically Treated-Bentonites by Inverse Gas Chromatography

et al. 2005

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“…As seen in the plots of Kp vs T -1 presented in Figure 3b, contrary to the results with halogenated compounds, PE-MCM-41E presented the lowest values of -∆Ha and Kp for the adsorption of benzene. A reasonable explanation can be based on the work of Inel et al (32) where it was suggested that the hydroxyl groups present in the silica surface behave as weak acid sites interacting strongly with the π-electrons of unsaturated organic molecules. Such interactions would be inhibited on PE-MCM-41E due to the surfactant layer on its surface.…”

Section: Resultsmentioning

confidence: 99%

Applications of Pore-Expanded Mesoporous Silica. 7. Adsorption of Volatile Organic Compounds

Serna-Guerrero

Sayari

2007

Environ. Sci. Technol.

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Three different varieties of mesoporous silicas were synthesized by varying the postsynthesis treatment of an as-synthesized ordered mesoporous material type MCM-41. The resulting materials consisted of a purely siliceous MCM-41, a pore-expanded MCM-41 (PE-MCM-41C), and a surfactant-laden pore-expanded MCM-41 (PE-MCM-41E) and were evaluated as adsorbents for two types of volatile organic compounds, i.e., chlorinated and aromatic hydrocarbons. Values of heat of adsorption and Henry's law constant were determined by pulse chromatography. Additionally, adsorption capacities were calculated with a dynamic method using breakthrough curves for single components in dry and humid environments. The surfactant-containing material exhibited good compatibility with chlorinated compounds in terms of heat of adsorption and efficiency in gaseous streams containing moisture. Purely siliceous mesoporous materials, i.e., MCM-41 and PE-MCM-41C, were more selective toward aromatic hydrocarbons but also gave rise to exceptionally strong adsorption.

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“…Therefore, the values of DG ads obtained here indicate that, the adsorption mechanism of radish leaves and black cumin on low-carbon steel in industrial water is physisorption. Further, the enthalpy of adsorption (DH ads ) and entropy of adsorption (DS ads ) can be calculated via (Ref 24,25): Additionally, the values of DH ads and DS ads can also be calculated using the following equation: Figure 10 shows the plot of ln K ads versus 1/T which gives straight line with slope of (ÀDH ads /R) and an intercept of (DS ads /R À ln 1000). The thermodynamic parameters are compiled in Table 5.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Corrosion Mechanism of Low-Carbon Steel in Industrial Water and Adsorption Thermodynamics in the Presence of Some Plant Extracts

Badiea

Mohana

2009

J. of Materi Eng and Perform

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The effects of radish leaves and black cumin as plant extracts on the corrosion behavior of low-carbon steel in industrial water in the temperature range of 30 to 80°C and velocity range of 1.44 to 2.02 m s 21 using potentiodynamic polarization, electrochemical impedance spectroscopy, and mass loss measurements have been investigated. The inhibition efficiency increased with increasing concentration of the plant extracts up to a critical value but it slightly decreased with increasing temperature. Inhibition efficiency values obtained from mass loss and potentiodynamic data were in reasonable agreement. Potentiodynamic polarization clearly indicated that radish leaves and black cumin extracts acted as anodic inhibitors. The adsorption behavior was found to obey the Flory-Huggins isotherm model. The associated activation parameters and thermodynamic data of adsorption were evaluated and discussed. The results show that radish leaves and black cumin could serve as effective inhibitors for low-carbon steel in industrial water media, with black cumin providing better protection than radish leaves.

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Evaluation of the thermodynamic parameters for the adsorption of some hydrocarbons on 4A and 13X zeolites by inverse gas chromatography

Cited by 31 publications

References 22 publications

Evaluation of the Thermodynamic Parameters for the Adsorption of Some Hydrocarbons on Chemically Treated-Bentonites by Inverse Gas Chromatography

Evaluation of the Thermodynamic Parameters for the Adsorption of Some Hydrocarbons on Chemically Treated-Bentonites by Inverse Gas Chromatography

Applications of Pore-Expanded Mesoporous Silica. 7. Adsorption of Volatile Organic Compounds

Corrosion Mechanism of Low-Carbon Steel in Industrial Water and Adsorption Thermodynamics in the Presence of Some Plant Extracts

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