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EFfect of alumina modification on the structure of cobalt-containing Fischer-Tropsch synthesis catalysts according to internal-field 59Co NMR data

Abstract : An internal-field Co-59 NMR study of cobalt-containing Fischer-Tropsch synthesis catalysts supported on different alumina modifications was reported. The Co/delta-Al2O3 sample was shown to contain single-domain fcc packing and stacking faults, whereas Co/gamma-Al2O3 gave signals from the fcc domain walls, hcp and stacking faults, thus indicating differences in the particle size of the studied samples. T-2 relaxation times were measured; their distribution in a spectrum is non-uniform, which allows signals to be distinguished by their relaxation times. Quantitative measurements of the relative atoms content in different packings revealed that the catalysts have mostly a defect structure. A brief historical background was presented to characterize the internal-field Co-59 NMR technique, the related problems, and different approaches to acquired data interpretation.
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https://hal.sorbonne-universite.fr/hal-01537701
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Submitted on : Monday, June 12, 2017 - 6:22:19 PM
Last modification on : Tuesday, October 6, 2020 - 2:58:02 PM

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A. S. Andreev, O. B. Lapina, Jean-Baptiste D’espinose de Lacaillerie, A. A. Khassin. EFfect of alumina modification on the structure of cobalt-containing Fischer-Tropsch synthesis catalysts according to internal-field 59Co NMR data. Journal of Structural Chemistry, Springer Verlag (Germany), 2013, 54 (S1), pp.102 - 110. ⟨10.1134/S0022476613070093⟩. ⟨hal-01537701⟩

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