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Synthesis of Textured Tungsten Disulfide Nanosheets and their Catalysis for Benzylamine Coupling Reaction
ChemCatChem ( IF 3.8 ) Pub Date : 2019-11-05 , DOI: 10.1002/cctc.201901576 Hua Liang 1 , Bing‐Qian Zhang 1 , Ji‐Ming Song 1
ChemCatChem ( IF 3.8 ) Pub Date : 2019-11-05 , DOI: 10.1002/cctc.201901576 Hua Liang 1 , Bing‐Qian Zhang 1 , Ji‐Ming Song 1
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Tungsten disulfide (WS2) has a graphite‐like structure with the properties of strippable and indirect/direct band gap conversion, which makes it have important applications in the fields of optoelectronics, catalysis and lubrication. Here, ultra‐thin WS2 nanosheets with texture on the surface were obtained by colloid synthesis method, and its phase, morphology and valence state were characterized. TEM images displayed that the obtained sample had flower‐like morphology composed of “petal” nanosheets with several stripes on the surface. Interestingly, the fabricated WS2 nanosheets exhibited excellent catalytic performance for the conversion of benzylamine with the yield reaching 97.9 % and excellent catalytic activity still being retained after 5 cycles of catalysis, and the WS2 nanosheets also had good catalytic activity for coupling reactions of benzylamine homologues to synthesize corresponding imines. Besides, the coupling reaction could be done in natural light without the need for additional light and oxygen atmosphere at certain temperature. Further research showed that in our reaction system, the benzylamine oxidative coupling reaction was a photothermal co‐catalytic process with thermal catalysis being dominant role and photocatalysis further improving the yield.
中文翻译：
织构化二硫化钨纳米片的合成及其对苄胺偶联反应的催化作用
二硫化钨（WS 2）具有类似石墨的结构，具有可剥离和间接/直接带隙转换的特性，使其在光电子，催化和润滑领域具有重要的应用。在这里，通过胶体合成法获得了表面具有纹理的超薄WS 2纳米片，并对其相，形态和价态进行了表征。TEM图像显示，所获得的样品具有由“花瓣”纳米片组成的类似花的形态，表面上具有多个条纹。有趣的是，人造WS 2纳米片对苄胺的转化表现出优异的催化性能，产率达到97.9％，并且经过5次催化循环后仍保留了优异的催化活性，WS 2纳米片对苄胺同系物的偶联反应以合成相应的亚胺也具有良好的催化活性。此外，偶联反应可以在自然光下进行，而在一定温度下不需要额外的光和氧气气氛。进一步的研究表明，在我们的反应体系中，苄胺氧化偶联反应是一种光热共催化过程，其中热催化作用占主导地位，光催化作用进一步提高了收率。
更新日期：2019-11-06
中文翻译：
织构化二硫化钨纳米片的合成及其对苄胺偶联反应的催化作用
二硫化钨（WS 2）具有类似石墨的结构，具有可剥离和间接/直接带隙转换的特性，使其在光电子，催化和润滑领域具有重要的应用。在这里，通过胶体合成法获得了表面具有纹理的超薄WS 2纳米片，并对其相，形态和价态进行了表征。TEM图像显示，所获得的样品具有由“花瓣”纳米片组成的类似花的形态，表面上具有多个条纹。有趣的是，人造WS 2纳米片对苄胺的转化表现出优异的催化性能，产率达到97.9％，并且经过5次催化循环后仍保留了优异的催化活性，WS 2纳米片对苄胺同系物的偶联反应以合成相应的亚胺也具有良好的催化活性。此外，偶联反应可以在自然光下进行，而在一定温度下不需要额外的光和氧气气氛。进一步的研究表明，在我们的反应体系中，苄胺氧化偶联反应是一种光热共催化过程，其中热催化作用占主导地位，光催化作用进一步提高了收率。
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