A tool for predicting the integrity of Y zeolite crystalline structure |
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Authors: | Maria Luisa A. Gonçalves Méri D. Vieira Wildson V. Cerqueira Ana Maria R. F. Teixeira |
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Affiliation: | 1.Analytical Chemistry Department,Universidade Federal Fluminense,RJ,Brazil;2.Inorganic Chemistry Department,Universidade Federal Fluminense,RJ,Brazil;3.Chemistry Pos Graduation Program,Universidade Federal Fluminense,RJ,Brazil |
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Abstract: | The purpose of this work was to employ the differential thermal analysis technique (DTA) to compare variations in the collapse energy of the Y zeolite crystalline structure in a fresh sample and in the sample after temperature treatment and impregnated with 3,000 ppm of vanadium and nickel. A small exothermic signal in the DTA curve at 950–1,150 °C indicated the collapse of the crystalline structure. The areas of the exothermic signals in the DTA curves of the samples indicated a 20% reduction in the exothermic area peak of sample treated 600 °C for 3 h and 25% reduction in same peak in the metal impregnated Y zeolite. These results were compared with X-ray data leading to the conclusion that metal impregnation affects the Y zeolite crystalline structure and that the DTA technique is a potentially useful tool for measuring the integrity of Y zeolite in catalysts. |
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