*3.3. Scanning Electronic Microscopy (SEM)*

SEM images of the catalyst were taken in order to corroborate the particle size. An FEI QUANTA 200 FEG (ESEM) was used at high-vacuum operation (<6 × <sup>10</sup>−<sup>4</sup> Pa (4.5 × <sup>10</sup>−<sup>2</sup> Torr)), electron landing energy of 5 keV and spot of 3.0.
