Electronic Tuning of Ni by Mo Species for Highly Efficient Hydroisomerization of n-Alkanes Comparable to Pt-Based Catalysts

Abstract

Modulation of the electronic structure of metal-based catalysts is a key to optimize the catalytic activity. Here, we have shown the electronic tuning of Ni by Mo species anchored on SAPO-11 (Ni–Mo/S-11) enabling the high-efficient hydroisomerization of n-alkanes comparable to commercial Pt/S-11, which is of great importance in producing fuel oils. The well-dispersed Ni particles intimately contacted with MoO2 are anchored on S-11 based on a vacuum-assisted route. There is the obvious presence of electron transfer from Mo species to Ni due to the intimate contact, which can increase the electron density around Ni and consequently promote H activation and desorption on Ni catalyst. Also, the good dispersion of Ni–Mo species on S-11 is favorable to expose more Brønsted acid sites of S-11, being responsible for the skeletal isomerization. These characteristics endow enhanced activity of 3.0Ni–0.5Mo/S-11 for the hydroisomerization of n-hexadecane with a high isomer yield of 81.4%, being comparable to 81.0% for 0.5 wt % Pt/S-11. The analysis of products showed similar isomerization and cracking mechanisms over 3.0Ni–0.5Mo/S-11 catalyst to Pt catalyst. Further, the presence of Mo species can enhance the stability, with no obvious change after 100 h continuous catalytic reaction. Both the catalytic activity and stability are much superior to those of monometallic Ni/S-11 and the reported non-noble-metal catalyst. This work focuses on developing high-effective non-noble-metal-based catalysts.

Two‐Dimensional Porous Molybdenum Phosphide/Nitride Heterojunction Nanosheets for pH‐Universal Hydrogen Evolution Reaction

“…[52] However, the Mo peaks have obvious change in P‐MoP/Mo 2 N. In the deconvoluted Mo 3d XPS spectra of P‐MoP/Mo 2 N, there are four pairs of peaks. The two doublets at 236.2 /233.0 eV and 232.7 /229.5 eV are assigned to the high‐oxidation‐state of Mo species (MoO 3 and MoO 2 ) [53] . The peaks located at 234.9 and 231.7 eV can be corresponded to Mo‐N of Mo 2 N, and the other two peaks at 231.8 and 228.7 eV can be ascribed to Mo‐P of MoP [35, 42] .…”

Crystalline‐Amorphous Ni2P4O12/NiMoOx Nanoarrays for Alkaline Water Electrolysis: Enhanced Catalytic Activity via In Situ Surface Reconstruction

“…[21] While for c-Ni 2 P 4 O 12 /a-NiMoO x /NF, except for Mo 6+ , the low-valence state species are observed in Mo 3d, where the peaks located at 229.7, 232.6, and 235.8 eV correspond to Mo δ+ (2 < δ <4), Mo 4+ /Mo 6+ and Mo 4+ , respectively. [22] A very small portion of Mo [7] As for O1s XPS spectra (Figure 3c), the peaks at 531.2, 532.0, and 533.3 eV for c-Ni 2 P 4 O 12 /a-NiMoO x /NF are assigned to the oxygen vacancies (O v ), Ni-P-O species and adsorbed water, respectively. [5,8] The oxygen-containing species of c-Ni 2 P 4 O 12 /c-NiMoO 4 /NF are similar to those of c-Ni 2 P 4 O 12 /a-NiMoO x /NF, where more Ni-P-O species can be found in the latter sample (Table S2, Supporting Information).…”

Ionic liquid and lysine co-assisted synthesis of the highly dispersed Ni/SAPO-11 catalyst

“…The electron transfer can increase the electron density in the d band of Ni and thus may promote the hydrogenation/dehydrogenation ability of the metal. 47–49…”