Sulfur adsorption and release properties of bimetallic Pd–Ni supported catalysts

Effect of Basic Promoters on Porous Supported Alumina Catalysts for Acetins Production

“…It is supposed that the incorporation of the aforesaid basic oxides occurs because of the use of single-source alkoxy precursors, which form pre-existing Me-O-Al bonds via sol-gel chemistry process, where Al 3+ (50 pm) cations are replaced by larger La 3+ (105 pm), Zn 2+ (75 pm) or Mg 2+ (78 pm) during the synthesis [21,23,24]. Some others but very similar preparations of alumina are used with basic promoters resulting in weaker XRD peaks, which suggests the inclusion of the basic promoters into the cubic structure [25][26][27][28]. Obviously, weak diffraction peaks for LA indicate poor crystallinity due to either small particles or amorphous structure related to La 2 O 3 oxides, but reflections of the γ-Al 2 O 3 phase prevail in the solid.…”

“…This type of bifunctional catalyst involves the combination of Ni and Co species representing the active sites dispersed on the alumina support, besides tuning their acidic properties provided by the incorporation of MgO, ZnO and La 2 O 3 . Because the decline in acidity of the alumina is known to be strongly influenced by the type of basic promoter [22][23][24][25][26][27][28], the suitable modification of the solid by MgO, ZnO or La 2 O 3 seems to be well suited for solid textural properties and stability preservation, which would further alleviate the water deactivation in EG reaction and thus to improve the overall selectivity to the acetins.…”