JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 61 No 4 (2016): Journal of the Chilean Chemical Society
Original Research Papers

STUDY OF THE CATALYTIC CONVERSION AND ADSORPTION OF ABIETIC ACID ON ACTIVATED CARBON: EFFECT OF SURFACE ACIDITY

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  • Rafael García,
  • Lorena Peralta,
  • Cristina Segura,
  • Catherine Sepúlveda,
  • I. Tyrone Ghampson,
  • Nestor Escalona
Rafael García
Universidad de Concepción, Facultad de Ciencias Químicas
Lorena Peralta
Universidad de Concepción, Facultad de Ciencias Químicas
Cristina Segura
Universidad de Concepción, Unidad de Desarrollo Tecnológico
Catherine Sepúlveda
Universidad de Concepción, Facultad de Ciencias Químicas
I. Tyrone Ghampson
Departamento de Ingeniería Química y Bioprocesos, Escuela de Ingeniería, Pontificia Universidad Católica de Chile
Nestor Escalona
Departamento de Ingeniería Química y Bioprocesos, Escuela de Ingeniería, Pontificia Universidad Católica de Chile Departamento de Química Física, Facultad de Química, Pontificia Universidad Católica de Chile
Published December 10, 2016
Keywords
  • Activated carbón,
  • Abietic acid,
  • Tall oil,
  • Adsorption capacity
How to Cite
García, R., Peralta, L., Segura, C., Sepúlveda, C., Tyrone Ghampson, I., & Escalona, N. (2016). STUDY OF THE CATALYTIC CONVERSION AND ADSORPTION OF ABIETIC ACID ON ACTIVATED CARBON: EFFECT OF SURFACE ACIDITY. Journal of the Chilean Chemical Society, 61(4). Retrieved from https://jcchems.com/index.php/JCCHEMS/article/view/119

Copyright (c) 2017 Rafael García, Lorena Peralta, Cristina Segura, Catherine Sepúlveda, I. Tyrone Ghampson, Nestor Escalona

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Abstract

This study reports the adsorption and catalytic conversion of abietic acid as representative compound of tall oil, using activated carbons. Acid functional groups present on CGRAN activated carbons favored the adsorption of abietic acid, probably through a physical adsorption mechanism. In contrast, the conversion of abietic acid was not favored in DARCO activated carbon by increase of acid sites thought HNO3 treatment. The detection of neoabietic, palustric and/or levopimaric acids as reaction products indicate that the transformation of abietic acid was by dehydrogenation and/or isomerization routes. The negative influence of acid sites on the catalytic activity, in addition to the non-detection of volatile products, suggests that the cracking pathway for the conversion of abietic acid over these catalysts can be ruled out. Contrasting effects of the surface groups on the adsorption capacity and the conversion was observed: strong acid sites of CGRAN activated carbon favor the adsorption of abietic acid and decrease competitive adsorption between substrate and solvent, while conversion is not favored by these acid sites. 

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