The effect of Ca2+ position in zeolite Y on selective oxidation of propane at room temperature

Xu, Jiang and Mojet, Barbara L. and Ommen van, Jan G. and Lefferts, Leon (2004) The effect of Ca2+ position in zeolite Y on selective oxidation of propane at room temperature. Journal of Physical Chemistry B: Materials, surfaces, interfaces, & biophysical, 108 . pp. 15728-15734. ISSN 1520-6106

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Abstract:	The activity of CaNaY zeolites in selective oxidation of propane with increasing Ca2+ content at room temperature was studied with infrared spectroscopy and ammonia temperature-programmed desorption. Increasing the Ca2+ exchange level in CaNaY zeolites resulted in a variety of altered properties: the amount of Brönsted and Lewis acid sites increased, the adsorption of propane increased, the initial acetone formation rate increased, and the desorption of acetone retarded. Moreover, all of these properties showed a sudden change with Ca2+ content above the 50% Na+ exchange level, which can be fully attributed to the location of Ca2+ in the Y-zeolite framework. It is convincingly shown that only Ca2+ ions located in the supercage contribute to the formation of Brönsted and Lewis acidity as well as propane oxidation activity at room temperature.
Item Type:	Article
Copyright:	© 2004 American Chemical Society
Faculty:	Science and Technology (TNW)
Research Group:	Catalytic Processes and Materials (CPM)
Link to this item:	http://purl.utwente.nl/publications/49395
Official URL:	http://dx.doi.org/10.1021/jp048656s
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