AlPO4?ZrO2 catalysts, IV. Cyclohexene skeletal isomerization activity of systems obtained in ethylene oxide |
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Authors: | A. Blanco J. M. Campelo A. Garcia D. Luna J. M. Marinas M. S. Moreno |
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Affiliation: | (1) Organic Chemistry Department, Cordoba University, E-14004 Cordoba, Spain |
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Abstract: | The use of AlPO4–ZrO2 (weight ratio AlPO4/ZrO2=3) as catalyst systems obtained with ethylene oxide and subjected to different stages of heat treatments has been studied through their catalytic activity in the skeletal isomerization of cyclohexene to 1- and 3-methylcyclopentenes (1- and 3MCP). The apparent rate constants and selectivity to 1-MCP are used for an evaluation of the presence and amount of strong acid sites, the only ones capable of giving rise to skeletal isomerization. The decrease in catalytic activity as calcination increases is consistent with not only the decrease in the amount of acid sites measured vs. weaker organic bases but also with the decrease in Brönsted acidity, as shown by the decrease in O–H band intensity.
AlPO4–ZrO2 ( AlPO4/ZrO2=3), , 1- 3- (1- 3-). 1- , . , , , O–H. |
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