The application of K2CO3-based catalysts from oil palm empty fruit bunches (EFB) aims to utilize and process biomass waste. TKKS contains K2CO3 which is needed as a raw material for catalyst production. K2CO3 in TKKS is obtained by solid-liquid extraction (leaching) method. The potassium content in the TKKS ash and solids resulting from the extraction was evaluated using XRF (X-Ray Fluorescence…