4.6 Article

Preparation of mesoporous CaO-ZrO2 catalysts without template for the continuous synthesis of glycerol carbonate in a fixed-bed reactor

Journal

APPLIED CATALYSIS A-GENERAL
Volume 590, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.apcata.2019.117313

Keywords

Glycerol; Glycerol carbonate; CaO-ZrO2; Fixed-bed

Funding

  1. Key Research and Development Program of Shandong Province [2018GGX107010]
  2. Natural Science Foundation of Shandong Province [ZR2016BL21, ZFt2018LB030]
  3. Science and Technology Research Program for Colleges and Universities in Shandong Province [J18KA107]
  4. Zaozhuang independent innovation and achievements transformation projects [201502]
  5. National Training Programs of Innovation and Entrepreneurship for Undergraduates [201710904063, 201710904064]

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Recently, transformation of glycerol into glycerol carbonate (GLC) has been of critical importance. Although traditional Ca-based catalysts present high activity for the GLC synthesis, their industrial applications are hindered by the leaching of Ca2+. Here, a series of mesoporous CaO-ZrO2 with high surface area were obtained without template. CO2 temperature-programmed desorption displayed that the basic properties of the catalysts can be controlled by the content of Ca dopant. Importantly, Ca2+ can be introduced into t-ZrO2 lattice, resulting in the formation of a solid solution structure. Based on systematic experiments, a correlation between their basic properties and catalytic behavior was explained. Under the optimized conditions, the catalyst with a certain ratio of Ca: Zr = 0.6: 1 showed an excellent performance with a 97% glycerol conversion and a 93% selectivity of GLC. Furthermore, the solid solution structure rendered this catalyst high resistance to reactant flushing in a fixed-bed, without leaching of active sites.

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