X-ray absorption spectroscopic investigation of partially reduced cobalt species in Co-MCM-41 catalysts during synthesis of single-wall carbon nanotubes

Article Abstract:

Chemometric tools were employed to analyze the in-situ dynamic X-ray absorption spectroscopy data to probe the state of Co-MCM-41 catalysts during reduction in pure hydrogen and under single-wall carbon nanotube synthesis reaction conditions. Controlling the rates of each steps of stage reduction process is the key to controlling the size of the metallic Co clusters formed in Co-MCM-41 catalysts.

Analysis, X-ray spectroscopy, Properties, Structure, Nanotubes

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Synthesis, characterization, and stability of Fe-MCM-41 for production of carbon nanotubes by acetylene pyrolysis

Article Abstract:

The study demonstrates the use of MCM-41 with Fe incorporated into the framework of MCM-41 and the carbon nanotubes (CNT) growth on Fe catalyst focusing on thorough characterization of the catalyst. There is an improvement in the structural order of siliceous MCM-41 upon the incorporation of 1 wt% Fe result of the knitting effect, but it diminishes as more Fe is incorporated.

Connecticut, Usage, Observations, Iron compounds, Electron paramagnetic resonance spectroscopy, Pyrolysis

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Synthesis and characterization of highly ordered Ni-MCM-41 mesoporous molecular sieves

Article Abstract:

Highly ordered Ni-MCM-41 samples with nearly automatically dispersed nickel ions were prepared reproducibly and characterized. EXAFS results demonstrate that the nickel particle size can be controlled by different prereduction temperatures but not by the pore radius of curvature as in the case of Co-MCM-41.

Science & research, Nickel Compounds, Research, Radicals (Chemistry)

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