氮掺杂碳纳米管包覆碳化硅作为不含金属的催化剂(英文)
Nitrogen-doped carbon nanotubes on silicon carbide as a metal-free catalyst作者机构：Institute of Chemistry and Processes for Energy Environment and Health (ICPEES) ECPM UMR 7515 du CNRS-University of Strasbourg 25 rue Becquerel 67087 Strasbourg Cedex 02 France Hanoi University of Mining and Geology Dong Ngac Tu Liem Hanoi Viet Nam
出 版 物：《催化学报》 (催化学报)
年 卷 期：2014年第35卷第6期
页 面：906-913页
核心收录：
学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术]
主 题：催化剂组成 碳纳米管 碳化硅 含金属 氮掺杂 固定床反应器 复合材料 氧化铝催化剂
摘 要：A hierarchical metal-free catalyst consisting of nitrogen-doped carbon nanotubes decorated onto a silicon carbide (N-CNTs/SiC) macroscopic host structure was prepared. The influence of N-CNTs incorporation on the physical properties of the support was evaluated using different characterization techniques. The catalyst was tested as a metal-free catalyst in the selective oxidation of H2S and steam-free dehydrogenation of ethylbenzene. The N-CNTs/SiC catalyst exhibited extremely good desulfurization performance compared to a Fe2O3/SiC catalyst under less conducive reaction conditions such as low temperature, high space velocity, and a low O2-to-H2S molar ratio. For the dehy-drogenation of ethylbenzene, a higher dehydrogenation activity was obtained with the N-CNTs/SiC catalyst compared to a commercial K-Fe/Al2O3 catalyst. The N-CNTs/SiC catalyst also displayed good stability as a function of time on stream for both reactions, which was attributed to the strong anchoring of the nitrogen dopant in the carbon matrix. The extrudate shape of the SiC support allowed the direct macroscopic shaping of the catalyst for use in a conventional fixed-bed reactor without the problems of catalyst handling, transportation, and pressure drop across the catalyst bed that are encountered with nanoscopic carbon-based catalysts.
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