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Ajala, E. O. and Ajala, M. A. and Ajao, A. O. and Saka, H. B. and Oladipo, A. C. (2020) Calcium-carbide residue: A precursor for the synthesis of CaO–Al 2 O 3 –SiO 2 –CaSO 4 solid acid catalyst for biodiesel production using waste lard. Chemical Engineering Journal Advances, 4.