Monitoring transport phenomena of paramagnetic metal-ion complexes inside catalyst bodies with magnetic resonance imaging

Chemistry : a European Journal
Jaap A BergwerffBert M Weckhuysen

Abstract

An indirect magnetic resonance imaging (MRI) method has been developed to determine in a noninvasive manner the distribution of paramagnetic Co2+ complexes inside Co/Al2O3 catalyst extrudates after impregnation with Co2+/citrate solutions of different pH and citrate concentrations. UV/Vis/NIR microspectroscopic measurements were carried out simultaneously to obtain complementary information on the nature of the Co2+ complexes. In this way, it could be confirmed that the actual distribution of Co2+ inside the extrudates could be derived from the MRI images. By combining these space- and time-resolved techniques, information was obtained on both the strength and the mode of interaction between [Co(H2O)6]2+ and different Co2+ citrate complexes with the Al2O(3) support. Complexation of Co2+ by citrate was found to lead to a stronger interaction of Co with the support surface and formation of an eggshell distribution of Co2+ complexes after impregnation. By addition of free citrate and by changing the pH of the impregnation solution, it was possible to obtain the rather uncommon egg-yolk and egg-white distributions of Co2+ inside the extrudates after impregnation. In other words, by carefully altering the chemical composition and pH...Continue Reading

References

Sep 1, 2000·Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry·M MatzapetakisA Salifoglou
Mar 15, 2003·Science·Alexis T Bell
Mar 24, 2004·Angewandte Chemie·Robert Schlögl, Sharifah Bee Abd Hamid
Nov 17, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·John VakrosAlexis Lycourghiotis
Apr 7, 2005·Journal of the American Chemical Society·Leon G A van de WaterBert M Weckhuysen
Aug 25, 2005·Journal of the American Chemical Society·Anna A LysovaBert M Weckhuysen
Jul 21, 2006·The Journal of Physical Chemistry. B·Theodora AtaloglouAlexis Lycourghiotis

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Citations

Nov 4, 2009·Journal of the American Chemical Society·Leticia Espinosa-AlonsoBert M Weckhuysen
Nov 3, 2010·Chemical Society Reviews·Robert A Schoonheydt
Oct 12, 2010·Chemical Society Reviews·Anna A Lysova, Igor V Koptyug
Jun 20, 2015·Chemical Reviews·Peter MunnikKrijn P de Jong

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