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论文类型：期刊论文

发表时间：2016-03-14

发表刊物：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录刊物：SCIE、EI、PubMed

卷号：55

期号：12

页面范围：4030-4034

ISSN号：1433-7851

关键字：hydrodesulfurization; nickel phosphides; selective hydrogenation; sulfur-containing layer

摘要：Preparation of Ni2P by temperature-programmed reduction (TPR) of a phosphate precursor is challenging because the P-O bond is strong. An alternative approach to synthesizing Ni2P, by reduction of nickel hexathiodiphosphate (Ni2P2S6), is presented. Conversion of Ni2P2S6 into Ni2P occurs at 200-220 degrees C, a temperature much lower than that required by the conventional TPR method (typically 500 degrees C). A sulfur-containing layer with a thickness of about 4.7nm, composed of tiny crystallites, was observed at the surface of the obtained Ni2P catalyst (Ni2P-S). This is a direct observation of the sulfur-containing layer of Ni2P, or the so-called nickel phosphosulfide phase. Both the hydrodesulfurization activity and the selective hydrogenation performance of Ni2P-S were superior to that of the catalyst prepared by the TPR method, suggesting a positive role of sulfur on the surface of Ni2P-S. These features render Ni2P-S a legitimate alternative non-precious metal catalyst for hydrogenation reactions.