The Mechanism of HDS Catalysis

A Mo–K Edge XAFS Study of the Metal Sulfide-Support Interaction in (Co)Mo Supported Alumina and Titania Catalysts

“…Assuming a S/Mo stoichiometry of 2 and a stacked configuration of the sulfur atoms Bouwens et al (15) calculated the Mo-S coordination to be between 4 and 5 for particle sizes with N Mo-Mo varying between 2 and 4, which is in agreement with our results. Additionally Startsev (14) argued on the basis of the electro-neutrality principle that molybdenum atoms in small MoS 2 particles cannot fully be coordinated by sulfur atoms because of excess negative charge that otherwise would accumulate on the slabs.…”

“…Although transition metal sulfides are already used in refineries since the late 1920s the interest in improving and understanding these catalysts is still high. A wealth of studies has been published on the structure and functioning of these kind of catalysts, as lately reviewed by several authors (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14).…”

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].…”

Structure and Nature of the Active Sites in CoMo Hydrotreating Catalysts Conversion of Thiophene

“…During the last decades an enormous number of papers have been published on the preparation and structure of these catalysts, the reaction mechanisms of HDS and HDN, the nature of the active sites, and the origin of the promotion effect of Co and Ni. For details on these subjects the reader is referred to some recent reviews (1)(2)(3)(4)(5)(6)(7)(8).…”

“…Many studies dealt with the reaction kinetics and mechanism of thiophene HDS (7)(8)(9)(10). In general, HDS reaction kinetics is described by Langmuir-Hinshelwood type of rate equations.…”