The effect of boron addition on the hydrodesulfurization activity of MoS2/Al2O3 and Co–MoS2/Al2O3 catalysts

Characterization and hydrodesulfurization activity of CoMo catalysts supported on sol–gel prepared Al2O3

“…For example, Morishige et al [57] showed that the molybdenum dispersion on Mo/BAl 2 O 3 catalysts decreased with increasing B/Al ratio. Recently, Usman et al [26,58] investigated in detail the effects of B on the dispersion of MoS 2 slabs on B-Al 2 O 3 supported catalysts. They observed an increase in the size of the MoS 2 slabs with a slight increase in the stacking upon B introduction, and deduced that B introduction caused the change in the active catalytic phase from CoMoS Type I with lower activity to CoMoS Type II with higher activity [54].…”

“…NiMoS phase might be achieved by the use of newly developed supports such as TiO 2 or mixed oxides, carbon, or zeolites, and/or by doping with third elements such as fluorine, phosphorus, or boron [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Recently, we reported that fine-tuning of the physical and chemical properties of γ-Al 2 O 3 supports by sol-gel synthesis improves the catalytic HDS performance of CoMo catalysts [29][30][31].…”

Characterization and hydrodesulfurization activity of CoMo catalysts supported on boron-doped sol–gel alumina

“…The above studies [26,57,58] pointed out that B introduction decreased the dispersion of the active (Co-promoted or unpromoted) MoS 2 species due to the decreasing interaction between MoS 2 and the Al 2 O 3 support. However, the decreasing dispersion of the CoMoS phase was not so significant.…”

Regeneration of Residue Hydrodesulfurization Catalyst

“…HDS catalysts are based on CoMo/ Al2O3 or NiMo/Al2O3 with various modifications, such as use of tungsten instead of molybdenum 2) 9) , additives such as silica 10) 15) , phosphorus 16) 24) , boria 13),22), 25) 28) , fluorine 29) 35) , zeolite related materials 36) 42) , titania 13),43) 51) and others, and optimized preparation method and physicochemical properties s u c h a s s h a p e , p o r e s i z e d i s t r i b u t i o n , a n d others 15 . Strangely enough, the origin of HDS catalysts is rarely described.…”