Effects of nitrogen doping on the structure of carbon nanotubes (CNTs) and activity of Ru/CNTs in ammonia decomposition |
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| Authors: | Jiuling Chen Zhong Hua Zhu Shaobin Wang Qing Ma Victor Rudolph Gao Qing Lu |
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| Affiliation: | 1. Division of Chemical Engineering, School of Engineering, The University of Queensland, St Lucia, QLD 4072, Australia;2. Department of Chemical Engineering, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia;3. ARC Centre of Excellence for Functional Nanomaterials, The University of Queensland, Brisbane, QLD 4072, Australia;1. Key Laboratory of Mesoscopic Chemistry, MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China;2. Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong;1. Center of New Chemical Technologies BIC, Boreskov Institute of Catalysis SB RAS, Omsk 644040, Russia;2. Siberian Federal University, Krasnoyarsk 660041, Russia;3. Reshetnev Siberian State University of Science and Technology, Krasnoyarsk 660037, Russia;4. Federal Research Center, Krasnoyarsk Science Center SB RAS, 660036, Russia;5. Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center SB RAS, Krasnoyarsk 660036, Russia;1. College of Chemical Engineering, Zhejiang University of Technology, Chaowang Road 18, Hangzhou, 310032, PR China;2. Institute of Industrial Catalysis, Zhejiang University of Technology, Chaowang Road 18, Hangzhou, 310032, PR China;1. Dalian National Laboratory for Clean Energy, State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | Nitrogen doping on carbon nanotubes (CNTs) was carried out using N2 microwave plasma at the powers of 200 and 400 W. N2 physisorption, XPS, XRD, TEM, and CO chemisorption were employed to investigate the effects of nitrogen doping on the structure of CNTs and the state of Ru particles supported on CNTs. The bulk structure and the surface texture of CNTs remain unchanged by such nitrogen doping. Two types of nitrogen species, pyridinic and quaternary nitrogen, were found on the surface of nitrogen doped CNTs. Pyridinic nitrogen atom may have a strong interaction with Ru. The average Ru particle size decreases with the increase of pyridinic nitrogen content. The activity of Ru/CNTs catalysts in ammonia decomposition is dependent on the dispersion of Ru particles and remaining nitrogen on the surface of CNTs. |
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