Publicado 2023-01-03
Palabras clave
- hidrogenación de tolueno,
- apertura de anillo,
- platino-paladio,
- zeolita HY
Cómo citar
Derechos de autor 2023 Revista UIS Ingenierías
Esta obra está bajo una licencia internacional Creative Commons Atribución-SinDerivadas 4.0.
Resumen
Catalizadores bimetálicos Pd-Pt/HY preparados por el método de co-impregnacion con variación atómica de Pd/Pd+Pt fueron estudiados en la reacción de conversión de tolueno y metilciclohexano. Los catalizadores se caracterizaron por el método BET, quimisorción de CO por el método de pulso, reducción programada de temperatura (H2-TPR) y termodesorción programada de amoniaco (NH3-TPD). Los resultados de la quimisorción de CO, la disminución de TOF de la reacción de tolueno a 110ºC por la adicción de Pd y el H2-TPR de los catalizadores Pd-Pt/HY sugieren la existencia de una fuerte interacción entre Pd y Pt. El NH3-TPD mostró que la incorporación de metales influye en el porcentaje de distribución relativa de sitios ácidos débil/fuerte que se presentan en orden decreciente de acidez: Pd0Pt100/HY> Pd100Pt0/HY> Pd33Pt67/HY. La composición atómica Pd/Pd+Pt = 0.33, y un porcentaje de distribución relativa de sitios ácidos débil/fuerte igual a 2, favorece la hidrogenación del tolueno a metilciclohexano en los sitios metálicos y la posterior isomerización del esqueleto en los sitios ácidos a través del intermedio di-metilciclopentano seguido de la apertura del anillo en los sitios metálicos, lo que conduce a una mayor formación de n-heptano en relación con el iso-heptano.
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