C/H2O Reaction under Supercritical Conditions and Their Repercussions in the Preparation of Activated Carbon

The results show that the reactivity of the two chars is much higher with supercritical water than with steam

Francisco Salvador; M. Jesús Sánchez-Montero; Carmen Izquierdo

2007

Key concepts

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  • Two chars prepared by carbonization of oak wood and anthracite were used to perform a comparative study of the gasification with supercritical water and with steam
  • The results show that the reactivity of the two chars is much higher with SCW than with steam
  • This increase can be explained in terms of the greater penetration of SCW and diffusional effects in the pore structure of the chars, some aspects suggest a possible change in the mechanism of reaction favored by the formation of clusters in SCW
  • When the oak char was activated with SCW, the smallest microporosity was broadened from the very first moments due to its very open pore structure, providing carbons with larger micropores and some mesoporosity
  • Highlighting the role of surface groups in the gasification of carbonized raw materials of different natures with steam and supercritical water at pressures ranging from 1 to 1000 bar

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