Published

2015-05-01

HDO del guaiacol mediante el uso de catalizadores NiMo soportados sobre carbón activado obtenido a partir de la torta de higuerilla

HDO of guaiacol over NiMo catalyst supported on activated carbon derived from castor de-oiled cake

Keywords:

Torta de higuerilla, carbón activado, hidrodesoxigenación, bioaceites. (es)
Castor de-oiled cake, activated carbon, hydrodeoxygenation, bio-oils. (en)

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Authors

  • Viviana Ospina University of Antioquia
  • Robison Buitrago Metropolitan Technological Institute
  • Diana Patricia Lopez University of Antioquia

Se prepararon dos carbones activados a partir de la torta de higuerilla; como métodos para su obtención se usaron la activación física y la activación química. Para la activación física se usó una mezcla H2O/CO2 como agente activante, y para la activación química, K2CO3. Las propiedades químicas y texturales de ambos carbones activados fueron caracterizados por isotermas de adsorción-desorción de N2, análisis termogravimétrico (TGA), espectroscopia infrarroja (FT-IR), reducción a temperatura programada (TPR), fluorescencia de rayos X (XRF) y microscopía electrónica de barrido (SEM). Los carbones activados se usaron como soporte en catalizadores NiMo sulfurados, los cuales fueron preparados por impregnación húmeda y reducidos in-situ para la reacción de hidrodesoxigenación del guaiacol (GUA), compuesto modelo de los aceites de pirólisis. La reacción de hidrodesoxigenación (HDO) se realizó en un reactor tipo batch a 5 MPa de H2 y 350 °C. Con el fin de comparar, los catalizadores comerciales también se probaron en reacción.  A pesar de que los catalizadores comerciales mostraron una mayor conversión de GUA, los catalizadores sintetizados exhibieron una mayor actividad y un mayor rendimiento en la producción de compuestos saturados y no oxigenados.

Physical and chemical activation methods were used to prepare two different activated carbons (ACs) from castor de-oiled cake. H2O/CO2 mixture was used as the physical activating agent, and for chemical activation potassium carbonate (K2CO3) was used. For both materials, textural and chemical properties were characterized by N2 adsorption–desorption isotherms, thermogravimetric analysis (TGA), Fourier Transform Infrared Spectroscopy (FTIR), thermal programmed reduction (TPR), X-ray fluorescence (XRF), and scanning electron microscopy (SEM). The ACs were used as supports for NiMo sulfide catalysts, which were prepared by wetness impregnation and in-situ sulfided for the hydrodeoxygenation (HDO) of guaiacol (GUA) as a model compound of bio-oil. The HDO reaction was carried out in a typical batch reactor at 5 MPa of H2 and 350 °C. Under the same test conditions, commercial catalysts were also tested in the reaction. Although the commercial catalysts displayed higher GUA conversion, the prepared catalysts showed higher activity and non-oxygenated and saturated products yield. 

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Copyright (c) 2015 Viviana Ospina, Robison Buitrago, Diana Patricia Lopez

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