Join Facebook to connect with Guillaume Rochart and others you may know. Promotion of the HCHO oxidation over gold supported on Co-promoted ceria catalysts can be related to the higher concentration of oxygen vacancies and an improvement in the redox properties, which can contribute to the better activation of O 2 and an enhancement of the oxygen mobility. View the profiles of people named Guillaume Rochart. Furthermore, no marked changes were found in gold dispersion upon adding cobalt.

X-ray photoelectron spectroscopy (XPS) characterization of the fresh catalysts indicated that the Au species were mainly in a slightly ionic δ + valence state, but did not exclude the possibility of metallic gold. Based on the HCHO amount (in μmol) converted into CO 2 per gram of gold per second after 40 h on stream, the 1.5Au/CeCo catalyst demonstrated the best activity (∼3.9) as compared to the other catalysts (≤2.0). 04:00 - 07:53 8 Races 04:0004:3005:0005:3206:0706:4007:1007:53 Les. The 3 wt% Au catalysts demonstrated a higher HCHO conversion than their low-gold counterparts (1.5 wt% Au), a remarkable improvement in the HCHO conversion was observed using Co-promoted ceria (9 mol%).

All of the supported Au catalysts exhibited HCHO oxidation into CO 2 at 25 ☌ and demonstrated a great stability for the time on stream (40 h).

The fresh supported Au catalysts were characterized using several techniques in order to investigate their morphological, structural and redox properties before being tested for formaldehyde (HCHO) total oxidation. Significant differences in terms of surface. Au catalysts with loadings of 1.5 and 3 wt% were dispersed over CeO 2 and Co (9 12 mol%) promoted CeO 2, using the deposition–precipitation method, followed by calcination at 350 ☌. Au/Co promoted CeO2 catalysts for formaldehyde total oxidation at ambient temperature: role of oxygen vacancies. Stéphane Celerier The synthesis of Ti3C2Tx (and Ti2CTx alike) MXenes is performed with a new etching environment (FeF3/HCl).

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