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Synthesis of SiOC/Al2O3 nano/macro composites through PDC method; investigation of potentials as layers of a packed bed reactor membrane

Abdollahi, S ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2020.04.229
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. Thanks to a wide range of pore sizes by nano/macro composites of SiOC/Al2O3, such composites can serve as different layers of the structure of Packed Bed Reactor Membranes (PBRM). In the present study, the Polymer-Derived Ceramics method (PDC) has been used to synthesize nano/macro structures. Firstly, the effect of toluene as an extra carbon source on structure and microstructure of SiOC glass-ceramics was evaluated, such that, 4% (Vol) toluene was recognized as the proper amount to facilitate the synthesis of β-SiC at 1300 °C proved by XRD, Raman spectroscopy, and HR-TEM. Moreover, the presence of micro/meso-porosities was assessed by BET and TEM, indicating the capability of SiOC to serve as the inner part of the membrane. Different amounts of α-Al2O3 altered the distribution of porosities, such that the more the amount of α-Al2O3, the increased the amount of macro-porosities and decreased the amount of micro/meso-porosities. Thus, each composite can act as a layer of membrane to form a gradient structure in pore size distribution. © 2020 Elsevier Ltd and Techna Group S.r.l
  6. Keywords:
  7. Micro/meso-porosities ; Nano/macro composite ; Packed bed reactor membrane ; Polymer-derived ceramics ; Alumina ; Aluminum oxide ; Chemical reactors ; Glass ceramics ; Pore size ; Silicon ; Silicon carbide ; Toluene ; As layers ; Carbon source ; Different layers ; Gradient structure ; Macro-porosity ; Packed bed reactor ; Structure and microstructures ; Packed beds
  8. Source: Ceramics International ; Volume 46, Issue 11 , 2020 , Pages 19000-19007
  9. URL: https://www.sciencedirect.com/science/article/pii/S0272884220311858