Synthesis of CNT-supported cobalt nanoparticle catalysts using a microemulsion technique: Role of nanoparticle size on reducibility, activity and selectivity in Fischer–Tropsch reactions
Synthesis of CNT-supported cobalt nanoparticle catalysts using a microemulsion technique: Role of nanoparticle size on reducibility, activity and selectivity in Fischer–Tropsch reactions
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DOI：
10.1016/j.apcata.2009.11.029
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发表时间：
2010-02
影响因子：
5.5
通讯作者：
Mariane Trépanier;A. Dalai;N. Abatzoglou
中科院分区：
文献类型：
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作者：
Mariane Trépanier;A. Dalai;N. Abatzoglou
使用惰性碳纳米管（CNT）负载催化剂研究了钴粒径对费托合成（FTS）催化剂性能的影响。用不同粒径（3- 10 nm）的钴粒子通过核反胶束反应制备了催化剂。已经表明，颗粒尺寸与用于催化剂制备的水与表面活性剂的比率（3-10）成比例。通过微乳液技术和在相对高的负载量（Co 10wt%）下已经产生非常窄的粒度分布。发现选择性和活性取决于钴颗粒尺寸。FTS率从0.36增加到0.44 gHC/gcat。h，C5+选择性从89wt%增加到92.5wt%。根据TEM分析，小的Co颗粒（2- 6 nm）主要被限制在CNT内部，其中其内表面的电子缺陷的影响改变了通常预期的催化剂的结构敏感性结果。最后，提出的微乳液技术合成的碳纳米管负载的钴纳米粒子增加了15%的CO转化率相比，由初湿含浸法制备。
The influence of cobalt particle size on catalyst performance in Fischer–Tropsch synthesis (FTS) has been investigated using inert carbon nanotube (CNT)-supported catalysts. The catalysts were produced by the core reverse micelle reactions with cobalt particles of various sizes (3–10nm). It has been shown that particle size is proportional to the water-to-surfactant ratio (3–10) used for the catalyst preparation. Very narrow particle size distributions have been produced by the microemulsion technique and at relatively high loading (Co 10wt%). Selectivity and activity were found to be dependant on cobalt particle size. The FTS rate increases from 0.36 to 0.44gHC/gcat./h and the C5+selectivity increases from 89 to 92.5wt% with increasing the average cobalt particle size from 2–3 to 9–10nm, respectively. According to TEM analysis, small Co particles (2–6nm) are mostly confined inside the CNTs where influence of its electron deficiency in the inside surface has changed the commonly expected catalyst's structure-sensitive results. Finally, the CNT-supported cobalt nanoparticles synthesized by the proposed microemulsion technique increased the CO conversion by 15% compared to those prepared by incipient wetness impregnation.