Nickel, Copper and Some of their Alloys as Catalysts for the Hydrogenation of Carbon Dioxide¹

Cu–Ni nanoalloy phase diagram – Prediction and experiment

“…7). This experimental lattice constant is within the limit of experimental accuracy in agreement with the value 0.3590 nm calculated using fcc lattice constants (for Cu: 0.36148 nm, Ni: 0.35239 nm) [35] and Vegard's law, which is valid for Cu-Ni bulk alloy [36]. The IR spectrum revealed the presence of organic layer on the surface of nanoparticles (Fig.…”

Influence of preparation method on supported Cu–Ni alloys and their catalytic properties in high pressure CO hydrogenation

“…Cu-Ni alloys are widely used as catalysts in, for example, steam reforming, [1][2][3][4][5][6] dimethyl carbonate synthesis, [7][8][9] hydrodeoxygenation, [10][11][12] water gas shift, [13][14][15][16][17] CO 2 hydrogenation, 18,19 and CO hydrogenation. [20][21][22][23] The chemical and physical properties of Cu-Ni alloys as well as the catalytic properties of the alloys have been described extensively in the literature.…”

In Situ Observation of Cu–Ni Alloy Nanoparticle Formation by X‐Ray Diffraction, X‐Ray Absorption Spectroscopy, and Transmission Electron Microscopy: Influence of Cu/Ni Ratio

“…These catalysts have been prepared by using different preparation methods such as: impregnation, [18,25] coprecipitation, [28] microemulsion, [29] and sol-gel methods, [30] and have been supported on different high surface area materials such as SiO 2 , [18,25,31,32] Al 2 O 3 , [28,33,34] ZnO, [17] TiO 2 , [11,12,35] ZrO 2 , [36,37] CeO 2 , [38] zeolite, [33] and carbon nanotubes. [39] Moreover, the selectivity and/or the activity is reported to change significantly upon variation in the Cu/Ni ratio for reactions such as hydrocarbon hydrogenolysis, [14] steam reforming, [25] CO 2 hydrogenation, [40,41] CO hydrogenation, [17] and water-gas shift. [42] These changes in selectivity and/or activity are largely related to the structure of the catalysts.…”

“…[42] These changes in selectivity and/or activity are largely related to the structure of the catalysts. [14,15,25,40,42] It is known that Cu has a lower binding energy than Ni for adsor-Silica-supported, bimetallic Cu-Ni nanomaterials were prepared with different ratios of Cu to Ni by incipient wetness impregnation without a specific calcination step before reduction. Different in situ characterization techniques, in particular transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray absorption spectroscopy (XAS), were applied to follow the reduction and alloying process of Cu-Ni nanoparticles on silica.…”