Physicochemical characterization of a diatomaceous upon an acid treatment: a focus on surface properties by inverse gas chromatography
| Autor: | Tassadit Benkacem, Alain Chamayou, Boualem Hamdi, Henri Balard, Rachel Calvet |
|---|---|
| Přispěvatelé: | Faculté des Sciences [Blida], Université de Saâd Dahlab [Blida] (USDB ), Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement (RAPSODEE), Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT) |
| Rok vydání: | 2016 |
| Předmět: |
Inverse gas chromatography
Diatomite Scanning electron microscope General Chemical Engineering Catalyst support Analytical chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nitrogen Surface energy 0104 chemical sciences Catalysis [SPI]Engineering Sciences [physics] chemistry.chemical_compound chemistry Nitric acid Acid treatment Fourier transform infrared spectroscopy 0210 nano-technology Nuclear chemistry |
| Zdroj: | Powder Technology Powder Technology, Elsevier, 2016, 294, p. 498-507. ⟨10.1016/j.powtec.2016.03.006⟩ |
| ISSN: | 0032-5910 |
| DOI: | 10.1016/j.powtec.2016.03.006 |
| Popis: | International audience; Natural diatomite from Sig/Algeria was treated with 0.5, 1.0, 3.0 and 5.0 M nitric acid solutions for 2 h under re flux at 333 K in order to improve its performance as support of catalyst. The purified silica powders obtained from frustules can also be used to reinforce composites. The solids obtained were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared (FTIR) spectroscopy, thermal analyses, and nitrogen adsorption-desorption at 77 K. Treatment of diatomite earth with nitric acid reduced mineral impurities, such as Fe2O3 and alkali metal oxides (CaO, MgO), eliminated carbonates and increased SiO2 ratio from 88% to 98%. The SEM micrographs showed the original geometry of the pores to be preserved. The surface properties were also evaluated using inverse gas chromatography at infinite dilution (IGC-ID) and finite concentration (IGC-FC). The interest here was to establish whether the technique is sufficiently sensitive to detect variations in the surface properties of the diatomite due to this chemical treatment. The IGC analysis permitted to reach several surface energy components with organic probes. Between them, the distribution function of the adsorption energy sites obtained with the isopropanol probe revealed a silica structure after the 5 M nitric add treatment. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect