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The sulfonated carbon solid acid catalyst (C-SO3H) was successfully generated from palm empty fruit bunch (PEFB) carbon via hydrothermal sulfonation by addition of hydroxyethylsulfonic acid and citric acid. The C-SO3H was identified contain of 1.75 mmol/g of acidity and 40.2% of sulphur. The surface morphology of C-SO3H showed pores with diameters of 3-6 µm and crystalline index (CrI) of material was decreased to 63.8% due to changed structure become carbon. The surface area of carbon wasdoi:10.21203/rs.3.rs-53551/v2 fatcat:fxwnavgssvgpfd4xy2qhhbxldq