A detailed surface characterization study of SBA-15 and B-SBA-15-x mesoporous materials using the IGC technique

Yarbaş T., ÇITAK A.

International Journal of Adhesion and Adhesives, cilt.118, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 118
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.ijadhadh.2022.103249
  • Dergi Adı: International Journal of Adhesion and Adhesives
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: B-SBA-15, Mesoporous materials, Surface characterization, Adsorption thermodynamic parameters, Dispersive surface energy, INVERSE GAS-CHROMATOGRAPHY, ACID-BASE PROPERTIES, NI/SBA-15 CATALYSTS, CALCIUM-CARBONATE, STRUCTURAL STATE, FREE-ENERGY, SILICA, BORON, ADSORPTION, THERMODYNAMICS
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

© 2022 Elsevier LtdPure and boron-containing B-SBA-15-x (molar ratio, Si/B = 50, 30, 10) mesoporous materials were synthesized by a direct hydrothermal procedure. Samples were characterized by XRD, ICP-OES, FT-IR, BET and SEM. Inverse gas chromatography (IGC) technique was used to determine the dispersive surface energies (γSd), adsorption thermodynamic parameters (ΔH, ΔG, ΔS) and the acid-base constants (KA and KD) of the samples. IGC experiments were performed at infinite dilution region at 200, 210, 220 and 230 °C. The surface characterization results confirmed that the SBA-15 structure was formed, boron was added to the structure and all samples have meso pores. The surface area of the pure SBA-15 was determined as 745.288 m2/g and it was found that the surface area decreases with increasing boron content. Physical adsorption occurred between the IGC probe molecules and all SBA-15 materials according to the adsorption thermodynamic parameters. (γSd) values of pure SBA-15, B-SBA-15-50, B-SBA-15-30 and B-SBA-15-10 were found at 40.873, 37.039, 36.636 and 37.444 mJ/m2 at 200 °C, respectively. It has been observed that the dispersive surface energy of all samples decreases with increasing temperature. According to the SC value calculated from the KA and KD parameters, the surface of B-SBA-15-10 with the highest boron content was found to be acidic. On the other hand the surfaces of all other samples were determined as basic.