Sulfonated Carbon Catalyst Prepared from Calcination of Lignin for Ethyl Levulinate Synthesis via Ethanolysis of Levulinic Acid von Abdull Hafidz Hassan, Muzakkir Mohammad Zainol, Kamarul Ridwan Zainuddin, Nurin Qistina Saperi, Mohd Asmadi Mohammed Yussuf, Norazah Abd Rahman, Nur Aina Najwa Mohd Nor Azman

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