4.7 Article

Controlled silica core removal from SiO2@MgAl core-shell system as a tool to prepare well-oriented and highly active catalysts

期刊

APPLIED CLAY SCIENCE
卷 216, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.clay.2021.106365

关键词

Core-shell structures; Layered double hydroxides; MgAl catalysts; Aldol condensation; Base catalysis

资金

  1. Czech Science Foundation of the Czech Republic [19-22978S]
  2. European Regional Development Fund-Project International mobility of employees of the University of Pardubice II [CZ.02.2.69/0.0/0.0/18_053/0016969]
  3. [LM2018103]

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This manuscript presents a method for preparing well-oriented @MgAl-layered double hydroxides and demonstrates the potential of @MgAl-mixed oxides in catalysis. The controlled removal of SiO2 core led to the formation of empty LDH spheres with preserved crystalline properties. The best furfural conversion was achieved with @MgAl-MO having a Si/(Si + Mg + Al) molar ratio of 0.11.
This manuscript presents the preparation of well-oriented @MgAl-layered double hydroxides (LDHs). It extends the reported preparation of SiO2@MgAl-LDH core-shell material (Si/(Si + Mg + Al) molar ratio = 0.54, Mg/Al = 2). There is introduced a new method for the gradual and controlled removal of the SiO2 core from SiO2@MgAl-LDH on treatment with a NaOH solution (1 M) for 1, 2, 4, and 6 h Si/(Si + Mg + Al) molar ratio from 0.06 to 0.52, Mg/Al = 2). Subsequent SiO2 leaching led to empty spheres with properties of the crystalline MgAl-LDH phase preserved. It is proved that @MgAl-LDH spheres formed do not collapse and hence, preserve their orig-inal spherical shape and structural properties. The potential of @MgAl-mixed oxides (MOs) obtained by thermal treatment of @MgAl-LDHs in catalysis is also demonstrated. When this material was used for the aldol condensation reaction of furfural with acetone, the best furfural conversion was obtained for @MgAl-MO with a Si/(Si + Mg + Al) molar ratio of 0.11.

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