Abstract
AbstractIn this paper, a novel Ni2P/black phosphorus (Ni2P/BP) supported on two‐dimensional α‐zirconium phosphate (α‐ZrP) hybrid material was prepared, and its catalytic activity for hydrodesulfurization (HDS) was investigated. Through the reaction of nickel salt with BP nanosheets obtained by freeze‐assisted exfoliation method, Ni2P nanoparticles can be formed and firmly anchored on the surface of BP, effectively preventing themselves from aggregating. BP is not only used as the phosphorus source for the synthesis of Ni2P, but its superior electron mobility can significantly promote the catalytic HDS activity of Ni2P species. Moreover, the support of two‐dimensional α‐ZrP nanosheets with a large specific surface area has a strong structure, which greatly improves the stability of catalyst. The Ni2P/BP@ZrP catalyst could reach a dibenzothiophene (DBT) conversion of 87.4 % within 6 h at 260 °C, much higher than the traditional NiMo/Al2O3 catalyst (65.6 %), showing a promising application for industrial catalytic desulfurization.
Highlights
Sulfur oxides (SOx), a common air pollutant originated from the combustion of sulfur compounds in fossil fuels, is the main cause of acid rain
The results indicate that a high yield of BP nanosheets from bulk BP crystals can be obtained adopting a freeze-assisted exfoliation method, and Ni2P/black phosphorus (Ni2P/BP) can be sucessfully synthesized by a facial one-step solvothermal reaction
Even though Ni2P exhibits an extraordinary HDS activity, it is unexpected to bring about some disadvantages: i) Ni2P nanoparticles with a large surface-to-volume ratio, possessing high surface energy, inevitably bond with other atoms resulting in agglomeration [15]. ii) The formation of metal-phosphorus bonds requires highly active precursors or harsh reaction conditions [16]
Summary
Sulfur oxides (SOx), a common air pollutant originated from the combustion of sulfur compounds in fossil fuels, is the main cause of acid rain. The traditional HDS catalysts are sulfided Co–Mo, Ni–Mo, and Mo–W with high HDS activity for sulfides, thiols, and disulfides [5,6,7] They are less efficient for removing aromatic thiophenes such as benzothiophene and dibenzothiophene (DBT) [8]. Transition metal phosphides (TMP) such as Fe2P, CoP, Ni2P, MoP, and WP, with high activity and stability, have been considered as high performance catalysts for removing aromatic sulfur compounds from fuel [9,10,11]. Ii) The formation of metal-phosphorus bonds requires highly active precursors or harsh reaction conditions [16] To solve these problems, black phosphorus (BP) nanosheets are created as P source to prepare Ni2P
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