NiMo catalysts supported on titania-modified SBA-16 for 4,6-dimethyldibenzothiophene hydrodesulfurization

SBA-15 supports modified by Ti and Zr grafting for NiMo hydrodesulfurization catalysts

“…Ti-and Zr-modified SBA-15 supports were prepared by chemical grafting [26,34]. Titanium(IV) isopropoxide (Ti(i-PrO) 4 , 97%, Aldrich) and zirconium(IV) propoxide (Zr(n-PrO) 4 , 70 wt.% solution in 1-propanol, Aldrich) were used as titania and zirconia sources, respectively, and dry ethanol as the solvent (EtOH, Aldrich, 99.999%).…”

“…However, because of very weak metal-support interaction, ultrasonic deposition of WS 2 had been used to achieve a better dispersion of W sulfided species [20]. In our group, a series of Al-and Ti-containing mesoporous molecular sieves SBA-16 with cubic structure (Im3m) and the respective NiMo catalysts were prepared and tested in 4,6-dimethyldibenzothiophene HDS [33,34]. It was found that aluminum or titanium incorporation in the SBA-16 support provides better dispersion to deposited Ni and Mo active species and increases their catalytic activity in HDS of 4,6-dimethyldibenzothiophene, one of the most refractory sulfur compounds.…”

“…This method was chosen because of the advantages it has in comparison with the incorporation of heteroatoms into the SBA structure during hydrothermal synthesis of SBA materials or incipient wetness impregnation. Thus, (i) chemical grafting allows deposition of highly dispersed species on the surface of the parent SBA without altering its structure and texture, (ii) grafted species are located on the support surface, this makes them all accessible for the interaction with NiMo active species [26,34,36]. In resume, chemical grafting technique permits modification of the chemical properties of solid surface without substantial changes in the physical characteristics of the material.…”

Textural, structural and electrical properties of TiO2nanoparticles using Brij 35 and P123 as surfactants

“…Titanium oxide (TiO 2 ) has been extensively studied owing to its wide range of applications which include photocatalysis, heterogeneous catalysis, energy storage and as white pigments, solar cell components, corrosion-protective coatings and optical coatings [1][2][3][4][5]. Titanium dioxide can be synthesized in three crystalline phases: rutile, brookite and anatase [6].…”

NiMo catalysts supported on graphene-modified mesoporous TiO2 toward highly efficient hydrodesulfurization of dibenzothiophene

“…The support of catalyst is one of the key factors that impact its catalytic performance [8][9][10]. Recently, TiO 2 has been recognized as a new generation of active support because of the moderate acid properties and the relatively weak interaction with the active metals, which is capable of improving the dispersion and reducibility of the supported active species [11,12].…”