Aguila, GonzaloSalinas, DanielaJiménez, RomelGuerrero, SichemAraya, Paulo2023-11-292023-11-292016Journal of the Chilean Chemical Society. Volume 61, Issue 4, Pages 3233 - 3238. 20160717-9324https://repositorio.unab.cl/xmlui/handle/ria/54229Indexación: Scopus.We studied the effect of the alkali metal type (Li, Na, and K) and the calcination temperature (500, 600 and 700 °C) in the activity for biodiesel production of catalysts prepared by impregnation method, with constant metal content of 10%w/w using ZrO2 as support. The results of the catalytic activity allowed to find an activity sequence regarding the alkali tested metals: Na > Li > K, with this sequence remaining constant independent of the calcination temperature. The high activity of the Na/ZrO2 system, and slightly lower activity of Li/ZrO2 , can be explained by the fact that higher calcination temperatures promote the formation of alkali-based zirconate species, M2 ZrO3 (M = Na or Li). The presence of these species is correlated with the higher activity of these catalysts, specifically with the Na and Li-based catalyst calcined at high temperatures (600-700 °C). These M2 ZrO3 species show higher basicity respect to other alkali metal oxide species, as was demonstrated with CO2 -TPD results. The higher activity corresponded to 10% Na supported on ZrO2 and calcined at 700 °C, which reached full conversion within just 30 minutes of reaction, which makes this system a promising heterogeneous replacement for the regular homogeneous systems.enAlkali MetalZirconiaHeterogeneous CatalystsTransesterificationBiodieselArtículo10.4067/S0717-97072016000400017