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In this research, a greener heterogeneous catalyst (named TPC) was obtained from ‘Ponkan’ tangerine (Citrus reticulata Blanco) peel ashes. TPC was efficient for biodiesel production through the methyl route using refined soybean oil and waste cooking oil as raw materials in a biorefinery‐based approach. Eight catalyst samples were prepared via calcination of the ashes at 700 °C (TPC7), 800 °C (TPC8)...