RETRACTED: Modification of SBA-15 mesoporous silica as an active heterogeneous catalyst for the hydroisomerization and hydrocracking of n-heptane
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Dossier post-publication
- Nature
- Retraction
- Motif
- Concerns/Issues about Referencing/Attributions;Investigation by Journal/Publisher;Objections by Author(s);Unreliable Results and/or Conclusions;
- Date
- 9/12/2025 0:00
- Signalé par OpenAlex ?
- Oui
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Résumé
In this study, a mesoporous SBA-15 silica catalyst was prepared and modified with encased 1% platinum (Pt) metal nanoparticles for the hydrocracking and hydroisomerization of n-heptane in a heterogeneous reaction. The textural and structural characteristics of the nanostructured silica, including both encased and non-encased nanoparticles, were measured using small-angle X-ray diffraction (XRD), nitrogen adsorption-desorption porosimetry, Brunauer-Emmett-Teller (BET) surface area analysis, Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Catalytic testing was carried out in a plug-flow reactor under highly controlled operating conditions involving the reactant flow rate, pressure, and temperature. Gas chromatography was used to analyze the species as they left the reactor. The results demonstrated that 1% Pt/SBA-15 has a high n-heptane conversion activity (approximately 85%). Based on the results of this experimental work, there is no selectivity in the SBA-15 catalysts for isomerization products because they are inactive at the relatively low temperature that is essential for hydroisomerization. On the other hand, the SBA-15 catalysts have a considerable selectivity for products that have cracks, owing to their ability to withstand extremely high temperatures (300-400 °C) as well as the availability of Lewis acid sites within the catalyst structure.
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La notice
- Revue
- Heliyon
- Thématique
- Mesoporous Materials and Catalysis
- Domaine
- Materials Science
- Établissements canadiens
- Memorial University of Newfoundland
- Organismes subventionnaires
- University of Baghdad
- Mots-clés
- CatalysisPorosimetryMaterials scienceMesoporous materialHeptaneScanning electron microscopeSelectivityChemical engineeringMesoporous silicaFourier transform infrared spectroscopyIsomerizationDesorptionTransmission electron microscopySilanolAdsorptionChemistryPorosityOrganic chemistryNanotechnologyComposite materialPorous medium
- Résumé présent dans OpenAlex
- oui