Meso-Structured HPW-MAS‑7 and HPW-MAS‑9 Composite Catalysts for Biodiesel Synthesis from Unrefined Green Seed Canola Oil

H₃PW₁₂O₄₀-MAS-7 and H₃PW₁₂O₄₀-MAS-9 composite catalysts exhibiting different structural orderings were assembled from zeolite beta and ZSM-5 precursors by a one-pot template-assisted self-assembly mechanism. Characterization results suggest that H₃PW₁₂O₄₀ was encapsulated into the mesoporous framework of the aluminosilicates without alteration of mesoporosity of the composites. The sequential introduction of H₃PW₁₂O₄₀ during the synthesis of MAS-7 and MAS-9 affected the surface morphologies. The textural characteristics of the composites were improved owing to the introduction of HPW after the addition of an inorganic precursor to the template leading to a material with a high BET surface area. As novel heterogeneous solid acid catalysts, the activity of the composites was determined for the biodiesel synthesis from the unrefined green seed canola oil, giving 95.4 ± 1.4 wt % methyl ester in 10 h at 180 °C with 5.5 wt % of catalyst and a 15.5:1 methanol to oil molar ratio. The recyclability of the composites is evaluated through four consecutive reactions.