Hydrodeoxygenation of 2-methoxyphenol over different Re active phases supported on SiO 2 catalysts

Kinetic study of the conversion of 2-methoxyphenol over supported Re catalysts: Sulfide and oxide state

“…Figure 1 shows the total and hydrodeoxygenation initial rates of the conversion of guaiacol over the ReS 2 /SiO 2 and ReOx/SiO 2 catalysts. As can be observed, the ReOx/SiO 2 catalyst was the more active catalyst, in agreement with our previous results [18].…”

“…Among unconventional supported metal sulfide catalysts, ReS 2 catalysts have been demonstrated to display a higher catalytic activity than a commercial sulfided NiMo/Al 2 O 3 catalyst for the conversion of guaiacol [16,17]. Recently, Leiva et al [18] found that ReOx/SiO 2 catalyst displayed a higher activity for guaiacol conversion and a higher selectivity towards deoxygenated compounds in comparison with ReS 2 /SiO 2 and commercial NiMo/Al 2 O 3 catalysts.…”

“…To explain those results, the reaction was modeled using a LangmuirHinshelwood-type theory in order to identify changes in the reaction mechanism for ReS 2 /SiO 2 and ReOx/SiO 2 catalysts. These catalysts were characterized by N 2 adsorption, X-ray photoelectron spectroscopy (XPS), Temperature programmed reduction (TPR) and Transmission electron microscopy (TEM) in our previous studies [18].…”

SUPPORT EFFECT ON CONVERSION OF QUINOLINE OVER ReS2 CATALYST

“…Table 2 summarizes the binding energies (BE) of the most intense Re 4f 7/2 component of each doublet, its relative proportions (between parentheses) and surface atomic ratio for Re/supports catalysts. Table 3 shows that the Re 4f 7/2 components of the most intense doublet remained constant in all the catalysts, at about 41.4 eV± 0.3, and corresponds closely to the values reported for ReS 2 [12,21,22]. A single peak for S 2p peaks at 162 eV ± 0.4 indicates the presence of S 2-for all the sulfided catalysts.…”

“…A single peak for S 2p peaks at 162 eV ± 0.4 indicates the presence of S 2-for all the sulfided catalysts. The BE of the Re 4f 7/2 peaks of the less intense doublet displayed by Re/g-Al 2 O 3 and Re/ZrO 2 catalysts was around 43.9 eV ± 0.3, which can be assigned to Re oxysulfide species [12,13,21,22]. These results indicate that Re sulfidation was slightly incomplete, and that the procedure used led to an estimated 90 % sulfidation for g-Al 2 O 3 -and ZrO 2 -supported catalysts.…”