Synthesis of biodiesel from waste cooking oil catalyzed by beta-cyclodextrin modified Mg-Al-La composite oxide

摘要

In this study, Mg-Al-La composite oxide loaded with ionic liquid [Bmim]OH was used as a catalyst for the synthesis of fatty acid isobutyl ester (FAIBE)viatransesterification between waste cooking oil and isobutanol. Mg-Al-La composite oxide was synthesized from the beta-cyclodextrin (beta-CD) intercalation modification of Mg-Al-La layered double hydroxides. The structure of the catalyst was characterizedviaXRD, BET and EDS. The results showed that the interlayer space of the catalyst was increased due to beta-CD intercalation modification. The IL/CD-Mg-Al-La catalyst exhibited significant catalytic activity and regeneration performance in transesterification due to large interlayer space and strongly alkaline ionic liquid. The yield of FAIBE achieved was 98.3% under the optimum reaction condition and 95.2% after regeneration for six times. The viscosity-temperature curve of FAIBE was determined and the phase transition temperature was -1 degrees C. The pour point of FAIBE was only -10 degrees C, which exhibited excellent low temperature fluidity.