Recent advances in heterogeneous catalysts for the synthesis of alkyl levulinate biofuel additives from renewable levulinic acid: A comprehensive review

Jimmy Nelson Appaturi, Jeyashelly Andas, Yik-Ken Ma, Bao Lee Phoon, Samaila Muazu Batagarawa, Fitri Khoerunnisa, M. Hazwan Hussin, Eng‐Poh Ng