By a News Reporter-Staff News Editor at Life Science Weekly -- Researchers detail new data in Life Science Research. According to news reporting from Beijing, People's Republic of China, by NewsRx journalists, research stated, "A series of core-shell-structured catalysts that consist of different-sized Co3O4 nano-particles and silica shells were prepared by an insitu coating method. The reduced catalysts displayed uniform core sizes that ranged from 5.5-12.7nm as ascertained by TEM, which concurred well with XRD analysis."
The news correspondents obtained a quote from the research from the Chinese Academy of Sciences, "The BET results revealed the highly mesoporous nature of the silica shell, which contributes to the facile access of the reactant gas to the active sites on the core particles. The degree of reduction of the calcined catalysts studied by H-2 temperature-programmed reduction was enhanced with increased Co particle size. In the Fischer-Tropsch synthesis, a volcano-like curve was plotted as the CO conversion and Co-time-yield revealed a rapid growth if the particle size increased from 5.5 to 8.7nm and then decreased with further increased particle size to 12.7nm, which is an effect of the combination of Co dispersion and reducibility. However, the turnover frequency remained invariant for catalysts with particle sizes larger than 8.7nm. If we consider the product selectivity, generally, larger particles led to a longer chain length of hydrocarbons with a larger chain-growth probability. The selectivity towards methane decreased and the corresponding heavy hydrocarbons (C19+) increased continuously with the increase of particle size."
According to the news reporters, the research concluded: "The catalyst with a particle size of 8.7nm exhibited the highest selectivity and the maximum space-time-yield towards middle distillates (C-5-C-18) because of the modest chain-growth probability."
For more information on this research see: Studies of Cobalt Particle Size Effects on Fischer-Tropsch Synthesis over Core-Shell-Structured Catalysts. Chemcatchem, 2013;5(12):3794-3801. Chemcatchem can be contacted at: Wiley-V C H Verlag Gmbh, Boschstrasse 12, D-69469 Weinheim, Germany. (Wiley-Blackwell - www.wiley.com/; Chemcatchem - onlinelibrary.wiley.com/journal/10.1002/(ISSN)1867-3899)
Our news journalists report that additional information may be obtained by contacting B. Zeng, Univ Chinese Academy Sci, Beijing 100049, People's Republic of China. Additional authors for this research include B. Hou, L.T. Jia, J.G. Wang, C.B. Chen, Y.H. Sun and D.B. Li (see also Life Science Research).
Keywords for this news article include: Asia, Cobalt, Beijing, Transition Elements, Life Science Research, People's Republic of China
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