Adsorption isotherms of polycyclic aromatic hydrocarbons on asbestos chrysotile by high-pressure liquid chromatography

Ménard, Hugues; Noël, Luc; Kimmerle, Frank M.; Tousignant, L.; Lambert, Maryse

doi:10.1021/ac00272a011

Cited by 14 publications

(2 citation statements)

References 5 publications

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“…The solvent flow rate (buffer solution) was set to 1 mL min -1 . The theoretical aspects of this method are described in detail elsewhere. , This analytical technique allows us to measure the adsorption isotherms in the same media used in electrolysis experiments.…”

Section: Methodsmentioning

confidence: 99%

Modification of the Surface Adsorption Properties of Alumina-Supported Pd Catalysts for the Electrocatalytic Hydrogenation of Phenol

et al. 2006

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The electrocatalytic hydrogenation (ECH) of phenol has been studied using palladium supported on gamma-alumina (10% Pd-Al2O3) catalysts. The catalyst powders were suspended in aqueous supporting electrolyte solutions containing methanol and short-chain aliphatic acids (acetic acid, propionic acid, or butyric acid) and were dynamically circulated through a reticulated vitreous carbon cathode. The efficiency of the hydrogenation process was measured as a function of the total electrolytic charge and was compared for different types of supporting electrolyte and for various solvent compositions. Our results show that these experimental parameters strongly affect the overall ECH efficiency of phenol. The ECH efficiency and yields vary inversely with the quantity of methanol present in the electrolytic solutions, whereas the presence of aliphatic carboxylic acids increased the ECH efficiency in proportion to the chain length of the specific acids employed. In all cases, ECH efficiency was directly correlated with the adsorption properties of phenol onto the Pd-alumina catalyst in the studied electrolyte solution, as measured independently using dynamic adsorption isotherms. It is shown that the alumina surface binds the aliphatic acids via the carboxylate terminations and transforms the catalyst into an organically functionalized material. Temperature-programmed mass spectrometry analysis and diffuse-reflectance infrared spectroscopy measurements confirm that the organic acids are stably bound to the alumina surface below 200 degrees C, with coverages that are independent of the acid chain length. These reproducibly functionalized alumina surfaces control the adsorption/desorption equilibrium of the target phenol molecules and allow us to prepare new electrocatalytic materials to enhance the efficiency of the ECH process. The in situ grafting of specific aliphatic acids on general purpose Pd-alumina catalysts offers a new and flexible mechanism to control the ECH process to enhance the selectivity, efficiency, and yields according to the properties of the specific target molecule.

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Section: Methodsmentioning

confidence: 99%

Modification of the Surface Adsorption Properties of Alumina-Supported Pd Catalysts for the Electrocatalytic Hydrogenation of Phenol

et al. 2006

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“…A number of HPLC systems such as normal-phase [20,21], reversed-phase [22,23], and liquid-liquid 124,251 has been developed for the separation of PAH components in both isocratic and gradient modes. Here we use an isocratic reversed-phase HPLC system under thermostated conditions, allowing automated qualitative and quantitative evaluations.…”

Section: Introductionmentioning

confidence: 99%

An off‐line two‐dimensional analytical procedure for determination of polycyclic aromatic hydrocarbons in smoke aerosol

Claessens

Bueren²

1987

J. High Resol. Chromatogr.

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SummarySmoke aerosol from stoves consists of a wide variety of chemical substances of which a number have toxic properties. To study the impact of aerosol emissions on health and environment reliable analytical procedures must beavailable for these samples. An off-line two-dimensional HPLC method is described for the determination of a number of polycyclic aromatic hydrocarbons (PAH). The method consists of a HPLC clean-up step yielding distinct fractions on activated silica and followed by analysis of each of the fractions by isocratic reversed phase HPLC. Detection is by UV and fluorescence monitors in series. Combination of the chromatographic data obtained from both the clean-up and analytical step provides additional qualitative information.

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Physico-chemical applications of HPLC

El'tekova¹,

Eltekov²

1989

Chromatographia

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Adsorption isotherms of polycyclic aromatic hydrocarbons on asbestos chrysotile by high-pressure liquid chromatography

Cited by 14 publications

References 5 publications

Modification of the Surface Adsorption Properties of Alumina-Supported Pd Catalysts for the Electrocatalytic Hydrogenation of Phenol

Modification of the Surface Adsorption Properties of Alumina-Supported Pd Catalysts for the Electrocatalytic Hydrogenation of Phenol

An off‐line two‐dimensional analytical procedure for determination of polycyclic aromatic hydrocarbons in smoke aerosol

Physico-chemical applications of HPLC

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