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Large-scale synthesis of carbon nanofibers on Ni-Fe-Al hydrotalcite derived catalysts: II: Effect of Ni/Fe composition on CNF synthesis from ethylene and carbon monoxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
43049 45952 2008 12 PDF Available
Title
Large-scale synthesis of carbon nanofibers on Ni-Fe-Al hydrotalcite derived catalysts: II: Effect of Ni/Fe composition on CNF synthesis from ethylene and carbon monoxide
Abstract

Carbon nanofibers (CNFs) were synthesized on a series of hydrotalcite (HT) derived Ni-Fe/Al2O3 catalysts in order to achieve optimization of quality and productivity. It was found that only the Fe catalyst is active in CO disproportionation and only the Ni catalyst is active in ethylene decomposition, whereas all catalysts are active in ethylene decomposition when the reactants are a mixture of C2H4/CO. The catalysts were characterized after CNF growth by XPS and EXAFS in order to understand the catalyst structural changes during CNF synthesis. The structure and properties of the as-synthesized CNFs were characterized by SEM, TEM, TPO and XRD to correlate the CNF structure and crystallinity with the catalyst composition and the nature of the gas precursors. Based on the experimental results a reaction mechanism was proposed. Moreover, it was demonstrated that Ni-Fe/Al2O3 catalysts derived from HT precursors are promising for controlled large-scale synthesis of CNFs.

Graphical abstractCarbon nanofibers (CNFs) were synthesized on hydrotalcite derived Ni-Fe/Al2O3 catalysts to achieve optimization of quality and productivity. Only Fe catalyst could produce CNFs from CO, and only Ni catalyst could produce CNFs from C2H4. In C2H4/CO mixture all catalysts could produce CNFs from C2H4 decomposition. Post-synthesis XPS and EXAFS characterization demonstrated that the bimetallic surfaces are restructured during CNF growth.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ni-Fe/Al2O3; Hydrotalcite; CNF synthesis; Large scale
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Large-scale synthesis of carbon nanofibers on Ni-Fe-Al hydrotalcite derived catalysts: II: Effect of Ni/Fe composition on CNF synthesis from ethylene and carbon monoxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 338, Issues 1–2, 1 April 2008, Pages 147–158
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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