structure of Cu 0.4 Zn 0.6 Al 2 O 4 catalyst. In this respect, the experiments were designed by
the response surface methodology (RSM), considering the main parameters: the amounts of
urea and ammonium acetate and the activity were assessed in esterification reaction. The
results of statistical analysis showed that the proposed second-order equation is highly
compatible with experimental data and the interaction between the ratios of both fuel types is …