Thiophene hydrodesulfurization over noble metal modified Co-clay catalysts

Influence of noble metals (Rh, Pd, Pt) on Co-saponite catalysts for HDS and HC of heavy oil

“…This is called the synergy effects of the promoter and the main active species (Co). A similar synergic phenomenon also presented by many authors in the literature [10,12]. The overall catalytic steps of noble metal promoted Co-saponite can be explained as shown in Fig.…”

“…Thus the presence of even a small amount of noble metal influence the overall reaction steps and consequently the reaction rates increase significantly. A similar mechanism for a bi-noble metal promoted Co catalyst has been reported for VGO hydrocracking [10]. Sugioka et al [3,4] also proposed a consistent mechanism for thiophene HDS over USY zeolite sup- ported Pt and Pt-Pd catalysts.…”

“…Usually, a trace of the noble metals is used because of the rare availability and the high cost. In earlier papers the present author and his co-worker reported Nomenclature E des energy of desorption (kJ/mol) k deso frequency factor n order of desorption R the universal gas constant T desorption temperature (K) T p temperature at maximum desorption rate (K) θ des concentration of adsorbed H 2 on the surface (mol/cm 3 ) α rate of temperature increase (K/min) comparable HDS and HC activities of bi-noble metal promoted Co-clay catalysts [9][10][11][12]. The presence of noble metals influenced to improve the stability of the Co-clay catalyst for longer period of time during hydrotreating of vacuum gas oil.…”

Synthesis of an yttrium-modified bulk Ni2P catalyst with high hydrodesulfurization activity

“…It has been recognized that current commercial hydrodesulfurization (HDS) catalysts are not adequate to meet such low regulated sulfur levels [3]. The challenge of producing cleaner oil from increasingly low-quality petroleum feedstocks has stimulated the development of high-performance HDS catalysts [4][5][6][7]. Ni 2 P shows the most remarkable activities among all known transition metal catalysts [7][8][9][10][11].…”

Preparation of Highly Active Alumina-Pillared Clay Montmorillonite-Supported Platinum Catalyst for Hydrodesulfurization

“…On the other hand, noble metal catalysts show high HDS and hydrogenation activities for the production of sulfur free diesel fuel containing lower aromatic compounds. Thus, noble metal catalysts have been much attention as new HDS catalysts [7][8][9][10][11][12].…”