1. Facile Preparation of Ni2P with a Sulfur-Containing Surface Layer by Low-Temperature Reduction of Ni2P2S6.
- Author
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Tian, Song, Li, Xiang, Wang, Anjie, Prins, Roel, Chen, Yongying, and Hu, Yongkang
- Subjects
LOW temperatures ,CRYSTALLINITY ,DESULFURIZATION ,HYDROGENATION ,METAL catalysts - Abstract
Preparation of Ni
2 P by temperature-programmed reduction (TPR) of a phosphate precursor is challenging because the P−O bond is strong. An alternative approach to synthesizing Ni2 P, by reduction of nickel hexathiodiphosphate (Ni2 P2 S6 ), is presented. Conversion of Ni2 P2 S6 into Ni2 P occurs at 200-220 °C, a temperature much lower than that required by the conventional TPR method (typically 500 °C). A sulfur-containing layer with a thickness of about 4.7 nm, composed of tiny crystallites, was observed at the surface of the obtained Ni2 P catalyst (Ni2 P−S). This is a direct observation of the sulfur-containing layer of Ni2 P, or the so-called nickel phosphosulfide phase. Both the hydrodesulfurization activity and the selective hydrogenation performance of Ni2 P-S were superior to that of the catalyst prepared by the TPR method, suggesting a positive role of sulfur on the surface of Ni2 P-S. These features render Ni2 P-S a legitimate alternative non-precious metal catalyst for hydrogenation reactions. [ABSTRACT FROM AUTHOR]- Published
- 2016
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