Potassium impregnated nanocrystalline mixed oxides of La and Mg as heterogeneous catalysts for transesterification

作者：Mutreja Vishal; Singh Satnam^*; Ali Amjad

来源：Renewable Energy, 2014, 62: 226-233.

DOI：10.1016/j.renene.2013.07.015

• Transesterification
• Biodiesel
• Heterogeneous catalysis
• Solid base catalyst

Potassium impregnated mixed oxides of lanthanum and magnesium in 1:1 to 1:5 atomic ratios were prepared by co-precipitation at a constant pH. These were characterized by FEG-SEM-EDX, TEM, Powder XRD, Hammett indicators and acid/base titration and, were evaluated as heterogeneous catalysts for transesterification of used cotton seed oil with methanol. The optimized reaction conditions for the catalyst, prepared at pH 10 using 1:3 atomic ratio of lanthanum and magnesium, were the use of 1:54 molar ratio of oil to methanol and 5 wt.% of the catalyst at 65 degrees C that resulted into 96% conversion to biodiesel within 20 min. The catalyst showed tolerance of 1 wt.% of moisture. Concentration of potassium ions leached out from catalyst into biodiesel was within permissible limit of ASTM.

• 出版日期2014-2