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Ca-alginate Encapsulated Il-Functionalized Phosphotungstic Acid as a Promising Catalyst for Fructose Conversion into 5-Hydroxymethylfurfural

Asghari, Kimia | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58095 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad; Sadjadi, Samaheh
  7. Abstract:
  8. To expand the applications of alginates as carbohydrate-based biopolymers, calcium alginate beads were developed as catalytic support for the encapsulation of functionalized heteropolyacid with ionic liquid. This novel heterogeneous acid catalyst was applied for the 5-HMF production from fructose. Here, the roles of heteropolyacids as acidic species and ionic liquids for better stabilization of such materials were more clearly understood. The impact of the heteropolyacid type on catalyst efficiency was also investigated. Under optimal reaction conditions (i.e., 120 °C, 100 min reaction duration, and 28 wt.% of reactor catalyst loading), which were obtained by RSM analysis, the 5-HMF production yield reached 97.4% from fructose through the DMSO solvent. The ability of calcium alginate beads to stabilize active species was proved by maintaining more than 90% of catalytic activity by PW-[VBIm]@Ca-Alg 25 catalyst after 5 cycles. A comparison of the optimum catalyst’s performance for 5-HMF production from other substrates displayed glucose to possess the highest yield of 44%. Finally; the microscopic behavior of this system understudied through the DFT analysis demonstrated experimental findings to be well-aligned with theoretical calculations. This showed the H3PW12O40 to have the highest fructose adsorption energy of -0.86 eV, which led to the highest product’s experimental yield
  9. Keywords:
  10. 5-Hydroxymethylfurfural (5-HMF) ; Heteropoly Acide Catalyst ; Ionic Liquids ; Alginate Beads ; Fructose Dehydration ; Phosphotungstic Acid

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