کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
66224 48420 2012 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sulfated fibrous ZrO2/Al2O3 core and shell nanocomposites: A novel strong acid catalyst with hierarchically macro–mesoporous nanostructure
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Sulfated fibrous ZrO2/Al2O3 core and shell nanocomposites: A novel strong acid catalyst with hierarchically macro–mesoporous nanostructure
چکیده انگلیسی

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.

Figure optionsDownload high-quality image (88 K)Download as PowerPoint slideHighlights
► We have synthesized fibrous ZrO2/Al2O3 nanocomposites.
► We characterised the nanocomposites by the usual materials characterisation techniques.
► The acidity of the obtained solid acids was tested by using them as catalysts for the benzoylation of toluene.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volumes 353–354, February 2012, Pages 95–105
نویسندگان
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