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学科主题: 物理化学
题名: Particle Size Effects in Fischer-Tropsch Synthesis by Cobalt
作者: Wang ZJ(王周君) ;  Liu ZJ(刘长军) ;  Gu DM(古德曼)
会议文集: Abstract Book
会议名称: International Conference on Clean Energy Science 2011
会议日期: 2011-4-10
出版日期: 2011
会议地点: 大连
通讯作者: D.WayneGoodman
出版者: 待补充
出版地: 待补充
合作性质: 墙报
部门归属: 502组
主办者: 大连化物所
摘要: Fischer-Tropsch (FT) synthesis has received considerable recent attention from both academic and industrial researchers. Co and Fe are two commercially used metal catalysts for FT synthesis. Co is preferred over Fe due to its greater activity, higher chain growth probability, and lower water-gas shift activity. However Co is approximately 1000 times more expensive than Fe; therefore optimal design of a Co FT catalyst is essential for its utilization. This goal could be achieved by decreasing the Co particle size to increase the exposed surface area per unit mass of the Co metal. However, some investigators have reported that Co particles smaller than 10 nm show a sharp drop in activity. This phenomenon is known as particle size effect, which is still controversial. In order to study the intrinsic particle size effect of Co catalysts in FT synthesis, a series of Co/SiO2 model catalysts with various metal coverages (0.25-6.0 ML), corresponding to sizes in the range of 1.4 - 10.5 nm were prepared in an ultrahigh vacuum chamber and tested at 513 K under atmospheric pressure in a batch reactor. The Co particle size distribution and the number of active sites were estimated from the TEM images. Kinetic data and post-reaction XPS spectra showed that for the small Co particles (1.4 - 2.5 nm), the Co surface was readily oxidized by water vapor formed during reaction, while for the relatively large Co particles (3.5 - 10.5 nm), such oxidation was not evident. The oxidation for the small Co particles leads to lower TOF and higher CH4 selectivity, while both reactivity and selectivity were relatively constant for the relatively large Co particles. The lack of intrinsic particle size effect for the metallic Co particles in the range of 3.5 - 10.5 nm is consistent with structure insensitivity in FT synthesis.
英文摘要: Fischer-Tropsch (FT) synthesis has received considerable recent attention from both academic and industrial researchers. Co and Fe are two commercially used metal catalysts for FT synthesis. Co is preferred over Fe due to its greater activity, higher chain growth probability, and lower water-gas shift activity. However Co is approximately 1000 times more expensive than Fe; therefore optimal design of a Co FT catalyst is essential for its utilization. This goal could be achieved by decreasing the Co particle size to increase the exposed surface area per unit mass of the Co metal. However, some investigators have reported that Co particles smaller than 10 nm show a sharp drop in activity. This phenomenon is known as particle size effect, which is still controversial. In order to study the intrinsic particle size effect of Co catalysts in FT synthesis, a series of Co/SiO2 model catalysts with various metal coverages (0.25-6.0 ML), corresponding to sizes in the range of 1.4 - 10.5 nm were prepared in an ultrahigh vacuum chamber and tested at 513 K under atmospheric pressure in a batch reactor. The Co particle size distribution and the number of active sites were estimated from the TEM images. Kinetic data and post-reaction XPS spectra showed that for the small Co particles (1.4 - 2.5 nm), the Co surface was readily oxidized by water vapor formed during reaction, while for the relatively large Co particles (3.5 - 10.5 nm), such oxidation was not evident. The oxidation for the small Co particles leads to lower TOF and higher CH4 selectivity, while both reactivity and selectivity were relatively constant for the relatively large Co particles. The lack of intrinsic particle size effect for the metallic Co particles in the range of 3.5 - 10.5 nm is consistent with structure insensitivity in FT synthesis.
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/116124
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Wang ZJ,Liu ZJ,Gu DM. Particle Size Effects in Fischer-Tropsch Synthesis by Cobalt[C]. 见:International Conference on Clean Energy Science 2011. 大连. 2011-4-10.
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