Migration of surface species on supports: a proof of their role on the synergism between CoSx or NiSx and MoS2 in HDS

EFFECT OF LIQUID SPATIAL VELOCITY ON M D [M D = Mn, Fe, Co, Ni, Cu AND Zn]//Mo SYNERGISM IN THE HYDRODESULPHURIZATION REACTION

“…The Co/SiO 2 and Mo/SiO 2 beds were separated by 5 mm of SiO 2 . After that, other supports (g-Al 2 O 3 ) 4 , other distances (up to 10 mm) 5 , other donors (Mn, Fe, Ni, Cu and Zn) 6 , other separators 5,7 , and other acceptors (W and Re) 6,8 have been studied in order to find the variables that improve this synergism via Hso. Moreover, other feed gas oil, dibenzothiophene (DBT) 9 , and 4,6 dimethyldibenzothiophene (4,6 DMDBT) 10 have been used.…”

Hydrodesulfurization of 4,6-DMDBT on a multi-metallic sulfide catalyst with layered structure

“…Though traditional HDS catalysts are highly efficient in removing thiols, sulfides, and disulfides, they are inefficient in ultra-deep desulfurization of refractory sulfur-containing compounds, such as 4,6-dimethydibenzothiophene (4,6-DMDBT). Therefore, development of novel HDS catalysts with super high activity is needed [5][6][7][8][9][10][11][12][13][14].…”

Tungsten and Rhenium as Hydrogenation Agents in the Hydrodenitrogenation of Pyridine Using Stacked Bed Catalyst Systems

“…As in previous studies [18][19][20][21][22][23] beds were diluted with SiO 2 (BASF D11-10) at a v/v ratio of 1:1, and the remainder of the reactor was filled with SiC.…”

“…All the catalysts were prepared as reported previouly [18][19][20][21][22][23] The support for all catalysts was γ-Al 2 O 3 , BASF D10-10 (N 2 BET 212 m 2 g -1 ) with a particle size of 0.84 and 1.19 mm. The nominal metal content of the precursors was 0.5, 1.5 and 3.0 atoms nm -2 for the monometallic catalysts while for bimetallic catalysts, 1.6 atoms nm -2 Ni, 2.9 atoms nm -2 Mo and 0.5 atoms nm -2 Re were used.…”

“…Therefore, in order to study HDN, different model molecules have been used [11][12][13][14] , one of which is pyridine [15][16][17] . Valdebenito et al 17 worked with stacked bed systems in the HDN of pyridine, proving that it is possible to achieve this process through the formation of hydrogen spillover (Hso), generating an effect similar to that observed for the HDS reaction [18][19][20][21][22][23] . This proposal is based on prior work by Ojeda et al 24 , who give direct proof of the hydrogen spillover effect, under conditions similar to those used in industry, and using gas oil as the feed source.…”