الفهرس 
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Abstract
The structures of NH4-Y zeolite and some of its dealuminated products were investigated by using the DTA and X-Ray differaction techniques. the textural properties were studied by measuring the adsorption of nitrogen at -196°c and of carbon dioxide at 25°c using conventional volumetric apparatus. the acidities of the zeolite catalysts were determined by following the adsorption and desorption of pyridine using a gravimetric apparatus.