Supported nickel catalysts for anisole hydrodeoxygenation: Increase in the selectivity to cyclohexane

Preparation of Nanocatalysts Using Deposition Precipitation with Urea: Mechanism, Advantages and Results

“…As indicated in Tab. 3, the size of the Ni/SBA‐15 catalyst leads to sizes varying from 2 to 7 nm with an average size of 3.2 nm, while the Ni/TiNTs catalyst has sizes varying from 4 to 20 nm with an average of 13.8 nm 37. The characterization results proved the precursor deposition in solution and the incorporation of metallic particles in the structure and channels of SBA‐15.…”

“…They also demonstrated that the NiNPs deposition preserves the porous structure of the SBA‐15. The DPU leads to the formation of nickel phyllsilicate (Ni 3 Si 2 O 5 (OH) 4 ) 55, Ni 37, and NiO 55. NiNPs deposit with a spherical shape and a size around 2.7–3.2 nm (for contents of 4 and 10 wt %).…”

“…Vargas‐Villagràn et al. 37 prepared Ni/TiNTs and Ni/SBA‐15 catalysts by DPU and found that this method leads to a total metal deposition (≈ 10 wt %). On the other hand, it was noted that the DPU causes a partial dissolution of SBA‐15 because of the high pH resulting in the formation of a new phase called “nickel phyllosilicate”.…”

“…The influence of these parameters on the nature of the deposit obtained is discussed in the following. However, the DPU was used to prepare materials based on different metals, e. g., gold nanoparticles (AuNPs) 1, 2, 4, 6, 13–21, silver nanoparticles (AgNPs) 6, 7, 22, platinum nanoparticles (PtNPs) 6, iron nanoparticles (FeNPs) 23, copper nanoparticles (CuNPs) 3, 12, 18, 24–30, nickel nanoparticles (NiNPs) 5, 31–37, cobalt nanoparticles (CoNPs) 38–41, ruthenium nanoparticles (RuNPs) 13, 42, and others. The supports used have different natures: simple oxides (TiO 2 3, 4, 7, 13, 14, 18, 43–46, Al 2 O 3 2, 9, 29, 47–52, ZrO 2 , CeO 2 , SiO 2 , etc.…”

Boosting the Ni‐Catalyzed Hydrodeoxygenation (HDO) of Anisole Using Scrap Catalytic Converters

“…The novel mechanochemically‐prepared catalytic and co‐catalytic systems including Ni/SiO 2 , pure SCATs and Ni/SCATs were fully characterized by XRD, SEM, TEM and nitrogen physisorption measurements and tested in the HDO of anisole. Under commonly employed batch conditions, i.e., 200 °C and 4 MPa of H 2 , [ 21,54 ] the joint use of Ni/SiO 2 and Ni/SCATs, boosted the conversion of anisole to more than 97% in only 40 min, with a rate of reaction >50% faster than the reaction catalyzed by the mere Ni/SiO 2 and by the Ni‐based catalysts currently reported in the literature.…”