Zro2-supported alkali metal (li, na, k) catalysts for biodiesel production

• GONZALO AGUILA ^[1] ; DANIELA SALINAS ^[2] ; ROMEL JIMÉNEZ ^[3] ; SICHEM GUERRERO ^[4] ; PAULO ARAYA ^[5]
  1. [1] Universidad Andrés Bello Facultad de Ingeniería Departamento de Ciencias de la Ingeniería
  2. [2] Universidad de Concepción Facultad de Ciencias Químicas Departamento de Físico Química
  3. [3] Universidad de Concepción Facultad de Ingeniería Departamento de Ingeniería Química
  4. [4] Universidad de los Andes Facultad de Ingeniería and Ciencias Aplicadas
  5. [5] Universidad de Chile Facultad de Ciencias Físicas and Matemáticas Departamento de Ingeniería Química and Biotecnología

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• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 61, Nº. 4, 2016, págs. 3233-3238
• Idioma: inglés
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  • 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, M2ZrO3 (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 M2ZrO3 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.