Synthesis of Catalytic Precursors Based on Mixed Ni-Al Oxides by Supercritical Antisolvent Co-Precipitation

• Published in: Catalysts 2022-12, Vol.12 (12), p.1597
• Main Authors: Nesterov, Nikolay S., Pakharukova, Vera P., Philippov, Alexey A., Gerasimov, Evgeny Y., Tsybulya, Sergey V., Martyanov, Oleg N.
• Format: Article
• Language: English
• Subjects: Aluminum; Aluminum oxide; Anisole; Catalysts; Chemical reactions; Chemical synthesis; Coprecipitation; Crystal structure; Distribution functions; green chemistry; heterogeneous catalysts; High resolution electron microscopy; Hydrogenation; mixed oxides; Nanoparticles; Nickel; nickel catalyst; Precursors; Solid solutions; Spinel group; supercritical antisolvent
• ISSN: 2073-4344; 2073-4344
• DOI: 10.3390/catal12121597

Mixed Ni-Al oxide catalytic precursors with different elemental ratios (20, 50, and 80 wt.% Ni0) were synthesized using green supercritical antisolvent co-precipitation (SAS). The obtained oxide precursors and metal catalysts were characterized in detail by X-ray diffraction (XRD) analysis, atomic pair distribution function (PDF) analysis, CO adsorption, and high-resolution transmission electron microscopy (HRTEM). It was found that the composition and structure of the Ni-Al precursors are related to the Ni content. The mixed Ni1−xAlxO oxide with NiO-based crystal structure was formed in the Ni-enriched sample, whereas the highly dispersed NiAl2O4 spinel was observed in the Al-enriched sample. The obtained metal catalysts were tested in the process of anisole H2-free hydrogenation. 2-PrOH was used as a hydrogen donor. The catalyst with 50 wt.% Ni0 demonstrated the highest activity in the hydrogenation process.