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Low-cost diatomite supported binary transition metal sulfates: an efficient reusable solid catalyst for biodiesel

Weiqing Chen1, Zhaoji Wu1, Ruoxue Peng1

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|February 23, 2023
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A novel diatomite-supported catalyst of binary transition metal sulfates (Fe and Zr) efficiently converts waste fatty acids into renewable biodiesel. This reusable catalyst achieved 98.90% conversion under optimal conditions, outperforming individual components.

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Area of Science:

  • Catalysis
  • Materials Science
  • Green Chemistry

Background:

  • Development of efficient and sustainable catalysts for biofuel production is crucial.
  • Diatomite offers a low-cost, high-surface-area support material.
  • Binary transition metal sulfates can enhance catalytic activity.

Purpose of the Study:

  • To synthesize and characterize a novel diatomite-supported binary transition metal sulfate catalyst (Fe₂(SO₄)₃&Zr(SO₄)₂@diatomite).
  • To evaluate the catalyst's performance in the production of renewable biodiesel from waste fatty acids.
  • To investigate the reusability and stability of the developed catalyst.

Main Methods:

  • Simple impregnation and calcination method for catalyst synthesis.
  • Characterization using TEM, XRD, FTIR, μ-XRF, and TG.
  • Optimization of reaction parameters including methanol-to-oil ratio, temperature, catalyst concentration, and reaction time.
  • N₂ adsorption/desorption analysis for surface area determination.

Main Results:

  • Fe₂(SO₄)₃&Zr(SO₄)₂@diatomite catalyst was successfully synthesized with uniform sulfate distribution on diatomite.
  • The catalyst exhibited a specific surface area of 1.54 m² g⁻¹.
  • Optimal conditions yielded a biodiesel conversion of 98.90%, surpassing individual metal sulfates and their diatomite-supported counterparts.
  • The catalyst demonstrated excellent reusability over three cycles with minimal activity loss after regeneration.

Conclusions:

  • The Fe₂(SO₄)₃&Zr(SO₄)₂@diatomite catalyst is a highly effective and recyclable material for biodiesel production from waste fatty acids.
  • The binary metal sulfate supported on diatomite offers superior catalytic performance compared to single components.
  • This study presents a promising pathway for sustainable biofuel synthesis using waste materials.