Highly Loaded and Dispersed Ni2P/Al2O3 Catalyst with High Selectivity for Hydrogenation of Acetophenone

Abstract

Highly loaded and dispersed Ni 2 P/Al 2 O 3 catalyst was prepared by the phosphidation of Ni/Al 2 O 3 catalyst with Ni loading of 80 wt.% in liquid phase and compared with the Ni/Al 2 O 3 catalyst for the hydrogenation of acetophenone. X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) etc. were used to characterize the textural and structural properties of the prepared catalysts. It was found that the Ni/Al 2 O 3 and Ni 2 P/Al 2 O 3 catalyst possessed high surface area, loading and dispersion. The Ni/Al 2 O 3 catalyst had higher apparent activity while the Ni 2 P/Al 2 O 3 catalyst had higher intrinsic activity for the hydrogenation of acetophenone (AP). Remarkably, the Ni 2 P/Al 2 O 3 catalyst exhibited high selectivity to 1-phenylethanol, due to repulsion of the phosphorous (P δ− ) for phenyl group and attraction of the nickel (Ni δ+ ) for oxygen atom of carbonyl group, leading to preferential hydrogenation of carbonyl group in acetophenone. The effect of the particle size of the catalyst on the chemical selectivity might be another reason for high selectivity on the Ni 2 P/Al 2 O 3 catalyst.

High-Performance Evolution of Ni2P@Hierarchical HZSM-5 as the Guaiacol Hydrodeoxygenation Catalyst

“…The peaks of Ni 2p 3/2 and P 2p 3/2 of the fresh catalyst are shown in Figure b,c, with 856.2 and 852.7 eV corresponding to Ni 2p 3/2 and 134.1 and 129.5 eV corresponding to P 2p 3/2 . The peaks of 856.2 and 852.7 eV corresponded to Ni 2+ and Ni δ+ (0 < δ < 2), and the peaks of 134.0 and 129.5 eV corresponded to P 5+ and P δ− (0 < δ < 1), which were compatible with Ni 2 P …”

“…The peaks of Ni 2p 3/2 and P 2p 3/2 of the fresh catalyst are shown in Figure 4b,c, with 856.2 and 852.7 eV corresponding to Ni 2p 3/2 and 134.1 and 129.5 eV corresponding to P 2p 3/2 . The peaks of 856.2 and 852.7 eV corresponded to Ni 2+ and Ni δ+ (0 < δ < 2), and the peaks of 134.0 and 129.5 eV corresponded to P 5+ and P δ− (0 < δ < 1), which were compatible with Ni 2 P. 22 The acidity of Ni 2 P@hierarchical HZSM-5-X(b) catalysts was compared with that of NH 3 -TPD. indicating that there were three types of acid sites on the catalyst surfaces: weak acid sites, medium acid sites, and strong acid sites.…”

Influence of Reduction Temperature on the Structure and Naphthalene Hydrogenation Saturation Performance of Ni2P/Al2O3 Catalysts

“…Al 2 O 3 is commonly used as a carrier for hydrogenation catalysts in industry, however, when Ni 2 P/Al 2 O 3 was prepared by the traditional programmed-temperature reduction method, it was difficult to prepare the Ni 2 P active phase on Al 2 O 3 carrier, which was due to the strong interaction between Al 2 O 3 and P species in the precursor to form AlPO 4 at high roasting temperatures; this seriously limits the application of Al 2 O 3 carrier in Ni 2 P catalysts [25][26][27][28]. It is generally believed that the interaction between Al 2 O 3 and P becomes weaker at low temperatures, and researchers have successfully prepared Ni 2 P catalysts by thermal decomposition of hypophosphite at low temperatures.…”

Catalyst characterization Ni-Sn nanoparticles supported in Al2O3and MgO: Acetophenone hydrogenation

“…The supported metallic catalysts often improve drastically when a small amount of a second metal is added, displaying not only an activity increase but also selectivity. 7,8 Selectivity can be improved with the addition of elements like P 9,10 or Sn 11,12 which can drastically increase the formation of the alcohol from the respective ketone. Tin has no substantial catalyst activity on itself in most reactions, due to its low interaction with H 2 , hydrocarbons, CO, and NO among others.…”