Nanokomposit selulosa/CaO-gamma-fe2O3 dan gamma-fe2O3-selulosa/CaO berbasis selulosa jerami padi sebagai katalis untuk sintesis Fatty Acid Methyl Ester (FAME) dari minyak kelapa = Nanocomposites of cellulose/CaO-gamma-Fe2O3 and gamma-Fe2O3-cellulose/CaO based rice straw cellulose as catalyst for the Synthesis Fatty Acid Methyl Ester (FAME) from coconut oil