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A solid base catalyst was prepared by the sodium potassium tartrate doped zirconia and microwave assisted transesterification of soybean oil was carried out for the production of biodiesel. It was found that the catalyst of 2.0(n (Na) /n (Zr) ) and calcined at 600°C showed the optimum activity. The base strength of the catalysts was tested by the Hammett indicator method, and the results...
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