Influence of the activation conditions of bimetallic catalysts NM–Mo/γ-Al2O3 (NM=Pt, Pd and Ru) on the activity in HDT reactions

Promoting effects in hydrogenation and hydrodesulfurization reactions on the zirconia and titania supported catalysts

“…Similar to described here preparation techniques, where the VI group metal sulfide was obtained before the introduction of promoter, have already been used by Merino et al [8] and Maugé et al [11] and the systems obtained using this approach showed good performances.…”

Promotion of Mo/Al2O3 sulfide catalyst by noble metals in simultaneous hydrodesulfurization of thiophene and hydrodenitrogenation of pyridine: a comparative study

“…An important point of the modification of the conventional Mo/Al 2 O 3 system by noble metals seems to be the presulfidation of Mo before deposition of noble metals, which can substantially improve its catalytic activity. Such improvement amounted to a factor of 2-3 achieved up to now in the parallel HDS of dibenzothiophene and hydrogenation of naphthalene over Pt, Pd and Ru-Mo/Al 2 O 3 catalysts [9,10] and in the parallel HDS of thiophene and HDN of pyridine over an Ir-Mo/Al 2 O 3 catalyst [11,12]. Deposition of different amounts of Ir on the sulfided and oxidic Mo/Al 2 O 3 catalysts led to the clearly distinguished activities of the both series.…”

“…In general, the magnitude of these effects, evaluated as the ratios of the activities of promoted catalysts to the sum of the activities of non-promoted single components, varied between 1.5 and 3. These values have been obtained for relatively low noble metal contents, usually at about 0.5 wt.% or less [7][8][9][10].…”

“…On the other hand, the highest HDN activity was often achieved with Ir and Pt in the reactions of quinoline and pyridine [2,3]. One approach for designing the more efficient catalysts consists in the addition of small amounts of noble metals to conventional Mo, CoMo or NiW catalysts [7][8][9][10][11][12][13]. Noble metal sulfides, either itself or combined with a conventional active phase, attract an increasing attention as possible candidates for the deep HDS [13][14][15][16].…”

Pt- (and Co-) Promoted Molybdena–Alumina Catalysts: Analysis of the Impregnation Steps

“…By knowing the extent of adsorption of these metals, it is possible to design the adsorption steps and to control their distribution for optimum catalytic performance. The new generation noble-metal-promoted MoO 3 /Al 2 O 3 systems, noble metal/Al 2 O 3 , and different combinations exhibit exceptional performance not only in hydrotreatment reactions of oil fractions but also for isomerization and hydrogenation processes (7)(8)(9).…”