Co/Ni/Mg/Al Layered Double Hydroxides as Precursors of Catalysts for the Hydrogenation of Nitriles: Hydrogenation of Acetonitrile

Catalytic hydrodenitrogenation of propionitrile over supported nickel phosphide catalysts as a model reaction for the transformation of pyrolysis oil obtained from animal by-products

“…Note that TPA can be formed in reaction between propane-1-imine intermediate and DPA. The above discussed spectral features clearly suggest that formation of higher amines most probably proceeds on the same reaction routes as suggested before on different supported metal catalysts [17][18][19][20][21].…”

“…Results imply that under the applied reaction conditions PN is easily hydrogenated to PA, which then can further transform to DPA and TPA products. Formation of these products suggests a similar reaction network than the one, which was put forward earlier for the catalytic hydrogenation of nitriles to amines [17][18][19][20][21][22]. Formation of amine is generally described to proceed through aldimine intermediate as shown by Eq.…”

“…It must be noted that former mechanism does not necessarily involve heterogeneous catalysis [22]. Although the product distribution, reaction intermediates, and surface species observed during the catalytic hydrogenation clearly support the above mechanism, some details, including the role of acidic and metallic sites in the reaction, are still matter of debate [17,18,20,21].…”

Recent advances on the utilization of layered double hydroxides (LDHs) and related heterogeneous catalysts in a lignocellulosic-feedstock biorefinery scheme

“…[58][59][60][61][62][63][64] Additionally, by introducing two different reducible cations in the LDH structure (e.g. Ni-Cu; [65][66][67] Ni-Co, [68][69][70] Pd-Cu, 71,72 among others), the subsequent thermal activation/ reduction can lead to the formation of bimetallic catalysts, whose catalytic and stability properties are generally better than those of the respective monometallic systems. The anion-exchange capacity of LDHs has also been exploited as a way to incorporate well-dispersed catalytic species in the interlayer-gallery space.…”

Oxygen Storage Capacity and Oxygen Mobility of Co-Mn-Mg-Al Mixed Oxides and Their Relation in the VOC Oxidation Reaction

“…For Co oxides derived from hydrotalcite precursors, the reduction processes occur at low temperatures (<500 °C) and high temperatures (>700 °C) [38]. The reduction at T < 500 °C is attributed to the reduction of Co oxide to Co metal, Co3O4→CoO→Co, and reduction processes at high temperatures are associated with the presence of Co-Al-type or species with strong interactions within the solid solution [39,40].…”