Highly active sulfided CoMo catalyst on nano-structured TiO2

Hydrodeoxygenation of Phenol Over Hydrotreatment Catalysts in their Reduced and Sulfided States

“…These results are in line with those found previously over sulfided CoMo catalysts used for HDS reactions. For example, Escobar et al [30] prepared CoMo HDS catalyst supported on high surface area (>300 m 2 g -1 ) nano-structured TiO 2 and tested in dibenzothiophene HDS. They found that the activity of CoMo/titania catalyst was two-fold to that of an alumina-supported commercial CoMo catalyst.…”

In situ thermo-Raman study of titanium oxide nanotubes

“…In fact, transformation of titania into nanotubes yields materials with specific surface area as large as 400 m 2 /g [17], opening the possibility of using this material as catalyst support in several processes. Recently, we have reported that nanostructured CoMoS/titania (i.e., cobalt-molybdenum on titania nanotubes) are twice as active in dibenzothiophene hydrodesulphurization as compared with the corresponding alumina-supported catalyst [18].…”

Slurry Impregnation of ZrO2 Extrudates: Controlled EggShell Distribution of MoO3, Hydrodesulfurization Activity, Promotion by Co

“…The promotional effect of 8.5 was reached after deposition of Co onto presulfided Mo catalysts supported on ZrO 2 -TiO 2 with molar ratio ZrO 2 /TiO 2 60/40 and BET surface area 165 m 2 g -1 , which resulted in 10% activity improvement in comparison with Al 2 O 3 supported catalyst [44]. Two fold higher HDS activities of CoMo catalysts were reported over nano-structured TiO 2 possessing BET surface area about 330 m 2 g -1 [46] and TiO 2 nanotubes of BET surface area 236 m 2 g -1 [47] than over Al 2 O 3 -supported counterparts but without referring on promotional effects. A relatively high promotional effect of 10 was obtained in the case of Ni supported over wide-pore ZrO 2 -TiO 2 Mo catalyst (molar ratio ZrO 2 /TiO 2 30/70 and BET surface area about 300 m 2 g -1 ) employing chelating agent assisted impregnation technique [45].…”

“…Open symbols-Mo catalysts, filled symbols-CoMo catalysts with Co deposited by SIM or CIM, halffilled symbols-CoMo catalysts with Co deposited by MIM over presulfided Mo catalysts promotional effects of 2.4 and 2.9 in the case of Co over zirconia-and titania-supported catalysts, respectively, in [42] or 3.3 over both supports in [16] were reported while they were about 5 or 11 over alumina-supported counterparts resulting in high integral HDS activity. On contrary, it is believed that further improvement of the ZrO 2 and TiO 2 based catalysts lie in tailored preparation of their mixed form with desirable textural properties [43][44][45] or nanostructured forms [46,47]. The CoMo catalyst supported on solvo-thermally treated ZrO 2 -TiO 2 with molar ratio ZrO 2 /TiO 2 30/70 and BET surface area 313 m 2 g -1 exhibited promotional effect about 3.2 but exceeded the HDS activity of a reference Al 2 O 3 -supported counterpart about twofold [43].…”