KOH-Promoted Catalyst Derived from Coffee Husk and Eggshell Composite for Biodiesel Production from Waste Frying Oil.

Analysis of Variance (ANOVA) The ANOVA results in Table demonstrate that the developed quadratic Model is highly significant ( P -value <0.0001, F -value = 344.57), confirming its excellent predictive capability, and the Lack-of-Fit test is nonsignificant ( P -value = 0.0534), validating the model’s adequacy.

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For the (K-CHC-ES)­A catalysts, the BET analysis revealed a clear trend of increasing surface area with higher calcination temperatures, directly aligning with the morphological changes observed in the Scanning Electron Microscopy (SEM) analysis ( Figure ).

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