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Ethyl esters were synthesized by simultaneous esterification and transesterification reactions, using Jatropha curcas L. oil as raw material and sulphated zirconia (SZ) as catalyst. SZ catalysts were synthesized by the precipitation method, and the final pH of each precipitation was 6, 7 and 8 (SZ6, SZ7 and SZ8, respectively). X-ray diffraction showed the presence and intensity of a tetragonal crystal...
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