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Journal of Structural Chemistry

2013 year, number Приложение 1

EFFECT OF ALUMINA MODIFICATION ON THE STRUCTURE OF COBALT-CONTAINING FISCHER–TROPSCH SYNTHESIS CATALYSTS ACCORDING TO INTERNAL-FIELD 59Co NMR DATA

A. S. Andreev1,2,3,4, O. B. Lapina1,2, J.-B. D’Espinose de Lacaillerie3,4, A. A. Khassin1,2
1G. K. Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences
2Novosibirsk State University
3University of Paris VI: Pierre et Marie Curie
4Soft Matter Sciences and Engineering, UMR CNRS 7615, ESPCI ParisTech
Keywords: internal-field 59Co NMR, cobalt-containing catalysts, cobalt

Abstract

An internal-field 59Co NMR study of cobalt-containing Fischer–Tropsch synthesis catalysts supported on different alumina modifications was reported. The Co/δ-Al2O3 sample was shown to contain single-domain fcc packing and stacking faults, whereas Co/γ-Al2O3 gave signals from the fcc domain walls, hcp and stacking faults, thus indicating differences in the particle size of the studied samples. T2 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 59Co NMR technique, the related problems, and different approaches to acquired data interpretation.