ZrO2-supported alkali metal (Li, Na, K) catalysts for biodiesel production

Gonzalo Aguila, Daniela Salinas, Romel Jiménez, Sichem Guerrero, Paulo Araya

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

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.
Original languageAmerican English
Pages (from-to)3233-3238
Number of pages6
JournalJournal of the Chilean Chemical Society
Volume61
Issue number4
DOIs
StatePublished - 1 Jan 2016

Keywords

  • Alkali metal
  • Biodiesel
  • Heterogeneous catalysts
  • Transesterification
  • Zirconia

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