“…In fact, glycerol is obtained as a by-product in biodiesel production by transesterification in large amount (10 kg of impure glycerol per 100 kg of produced biodiesel) [9,10]. Because of its high functionalization, glycerol can be transformed into a number of value-added products such as 1,2-propanediol (1,2-PDO), 1,3-propanediol (1,3-PDO), acrolein, olefins, etc., by a range of heterogeneously-catalyzed chemical processes that can compete with the classical petrochemical-route [11].…”