Sulfated fibrous ZrO₂/Al₂O₃ core and shell nanocomposites: a novel strong acid catalyst with hierarchically macro-mesoporous nanostructure
Date
2012
Authors
Liu, E.
Locke, A.J.
Frost, R.L.
Martens, W.N.
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Journal article
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Molecular Catalysis, 2012; 353-354:95-105
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Abstract
A series of solid strong acid catalysts were synthesized from fibrous ZrO₂/Al₂O₃ core and shell nanocomposites. In this series, the zirconium molar percentage was varied from 2% to 50%. The ZrO₂/Al₂O₃ nanocomposites and their solid strong acid counterparts were characterised by a variety of techniques including ²⁷Al magic angle spinning nuclear magnetic resonance (MAS-NMR), scanned electronic microscopy (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption and infrared emission spectroscopy (IES). NMR results show that the interaction between zirconia species and alumina strongly correlates with pentacoordinated aluminium sites. This can also be detected by the change in binding energy of the 3d electrons of the zirconium. The acidity of the obtained solid acids was tested by using them as catalysts for the benzoylation of toluene. It was found that a sample with a 50% zirconium molar percentage possessed the highest surface acidity equalling that of pristine sulfated zirconia despite the reduced mass of zirconia.
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Link to a related website: https://eprints.qut.edu.au/47911/1/47911S.pdf, Open Access via Unpaywall
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Copyright 2011 Elsevier BV