Abstract
Stearic acid (C 17 H 35 COOH: C 17 -acid) was treated using a batch reactor with supercritical water (SCW) of 673 K and 0.17 g/cm 3 for 30 min. In SCW, C 17 -acid was stable (2% conversion) and the main products were CO 2 and C 16 alkene. An addition of alkali hydroxide (NaOH and KOH) in the SCW reaction enhanced the decarboxylation of C 17 -acid with the main products being CO 2 and C 17 alkane. Metal oxides (CeO 2 , Y 2 O 3 and ZrO 2 ) enhanced the decarboxylation of C 17 -acid and the main products were CO 2 and C 16 alkene. Based on the results, the reaction mechanism was proposed.
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