Journal
CHEMICAL ENGINEERING COMMUNICATIONS
Volume 203, Issue 1, Pages 114-122Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00986445.2014.962688
Keywords
Biodiesel; CaO; CaO/MgO; Heterogeneous catalysis; MgO; Transesterification of n-butyl acetate
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Funding
- research council of Arak University, Arak, Iran [89/12218]
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This work reports the synthesis and characterization of CaO/MgO mixed oxide with different CaO/MgO mass ratios prepared by the co-precipitation method in a basic medium and subsequent calcination of the precursors. These mixed-oxide materials were characterized by XRD, FT-IR, SEM, and BET. The alkalinity of samples was determined by CO2 temperature-programmed desorption (CO2-TPD). Results show that the CaO/MgO samples contained mixed crystalline phases of cubic CaO and hexagonal MgO species. Decreasing the CaO/MgO ratio resulted in low average pore diameter and enhanced BET surface area. Transesterification of n-butyl acetate with methanol was studied using a CaO/MgO catalyst at atmospheric pressure and 95 degrees C, a model reaction to evaluate the potential of these catalysts for biodiesel production. The highest activity was found for a CaO/MgO mass ratio of 8: 2 with conversion percentage of 83. The effects of calcination temperature, reaction time, reaction temperature, methanol/n-butyl acetate molar ratio, and catalyst recycling were investigated.
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