Synthesis of multi-walled carbon nanotubes over tungsten-doped cobalt-based catalyst derived from a layered double hydroxide precursor |
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| Affiliation: | 1. College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, The Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China;2. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China;1. Department of Chemistry, Hankuk University of Foreign Studies, Yongin, 17035 Gyeonggi-do, Republic of Korea;2. Division of Plasma Convergence R&BD, Cheorwon Plasma Research Institute, Gangwon-do, Republic of Korea;3. Korea Institute of Industrial Technology (KITECH), 137-41 Gwahakdanji-ro, Gangneung-si 25440, Republic of Korea;4. Department of Energy and Materials Engineering, Dongguk University-Seoul, Seoul 04620, Republic of Korea;1. Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471 Tabriz, Iran;2. Faculty of Chemistry, Kharazmi University, 15719-14911 Tehran, Iran;3. Department of Nanotechnology, Near East University, 99138 Nicosia, North Cyprus, Mersin 10, Turkey |
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| Abstract: | Multi-walled carbon nanotubes (CNTs) were prepared over a series of W-doped Co-based catalysts derived from layered double hydroxide precursor by catalytic chemical vapor deposition (CCVD) of acetylene. The materials were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption–desorption experiments and Raman spectroscopy. The effect of the proportion of W in the Co-based catalysts on the carbon yield, diameter uniformity and quality of CNTs was investigated. The results demonstrated that with the increasing W/Co molar ratio from 0 to 1.0, both the mean number of walls and the average diameter of CNT produced over catalysts increased from about 8 to 28 nm and from about 12.1 to 23.7 nm, respectively. A small amount of tungsten added to the catalyst with the W/Co molar ratio of 0.3 could facilitate the dispersion of catalytically active Co species on the surface of support, and thus uniform and high-quality CNTs with a remarkably high yield of ca. 1600% were obtained. |
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| Keywords: | Catalyst Tungsten Carbon nanotubes Layered double hydroxide precursor Chemical vapor deposition |
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