Review Article
Heterogeneous Tin Catalysts Applied to the Esterification and Transesterification Reactions
Table 8
Properties of 30% wt. /Fe2O3-SnO2 catalysts obtained from iron(III) different precursors FeCl3 (1), Fe(NO3)3 (2), and Fe2(SO4)3 (3) calcined at 500°C and conversion of FFA esterificationa,b [33].
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: initial electrode potentional indicates the maximum acid strength of the sites; NAS: acid site numbers. bReaction conditions: 250 rpm, 25 mL of methanol 25 mL of crude palm oil (10.2 wt.% of FFA) was added, followed by methanol (45 mL), 1 g of catalyst, 3 hours, 80°C. |