Figure -23 illustrate the results of the catalytic tests in terms of conversion of 2-butanol and yield to MEK. Figure shows that the activity of Co3O4 slightly increased during the first days of operation, reaching a maximum of 8% yield after three days. But then, starting from the fourth day, the yield decreased linearly, and after a total of seven days of operation, it reached a plateau of around 6%. The values of the conversion were comprised between 9% and 16%. These results are comparable with those obtained during the catalytic test for the screening of operating conditions and confirm the reproducibility of the experiment.