Clay Enriched With Ca2+ and Cu2+ As the Catalyst for the Production of Methyl Esters from CPO on a Laboratory Scale
Indarung clay (Indarung region, Indonesia) has been successfully enriched with Ca2+ and Cu2+ ions. XRF, XRD, FTIR, and SAA analyses confirmed that calcination process had no significant effect on improving its performance so that the clay was simply heated at 383 K before use. Measurements using AAS showed that the clay is enriched with Cu2+ ions more easily than Ca2+ ions.