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Percorrer por autor "Rodriguez, Juan"

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  • Experimental and modelling study of CWPO over P-doped carbon black catalysts
    Publication . Díaz de Tuesta, Jose Luis; Quintanilla, Asunción; Casas, Jose A.; Rodriguez, Juan; Ribeiro, Rui; Silva, Adrián; Faria, Joaquim; Gomes, Helder
    The catalytic wet peroxide oxidation (CWPO) of 4-nitrophenol (4-NP) with phosphorous doped carbon black catalysts (P-CB) was studied in the present work. The effect of reaction time (0-8 h), temperature (50-80 ºC) and initial pH (2-4) on 4-NP removal and hydrogen peroxide consumption was investigated. Results exhibited the presence of an induction period showing an inverse dependence with the operating temperature and initial pH (pH0). The power law model described well the reaction rates of 4-NP removal and hydrogen peroxide consumption. The slow initial rates were reproduced by taking into account the evolution of pH, expressed in terms of proton concentration in the model. Fitted kinetic equations and estimated parameter values are summarized in Table 1. As can be seen in Figure 1, the kinetic model properly describes the oxidation process.
    2016Documento de conferência Acesso aberto Ver mais
  • N, B and P doped carbon blacks for the CWPO of 4-nitrophenol solutions
    Publication . Díaz de Tuesta, Jose Luis; Quintanilla, Asunción; Casas, Jose A.; Rodriguez, Juan; Ribeiro, Rui; Silva, Adrián; Faria, Joaquim; Gomes, Helder
    A previous work has demonstrated that the Chemviron Carbon Black (CB, ref.:2156090) is a catalyst capable to combine a good activity with an adequate stability for long term use and high efficiency of H2O2 consumption in the CWPO of phenol [1]. In the current work, this catalyst was tested for the oxidation of 4-nitrophenol (4-NP). Furthermore, the catalyst was doped with nitrogen, boron and phosphorous in order to increase its activity.
    2015Documento de conferência Acesso aberto Ver mais
  • Reaction lag-phase in the CWPO of 4-nitrophenol solutions with P-doped carbon black catalysts
    Publication . Díaz de Tuesta, Jose Luis; Quintanilla, Asunción; Casas, Jose A.; Rodriguez, Juan; Ribeiro, Rui; Silva, Adrián; Faria, Joaquim; Gomes, Helder
    Previous works have demonstrated that Chemviron Carbon Black (CB) is a catalyst capable to combine a good activity with an adequate stability for long term use and high efficiency of H2Ü2 consumption in the catalytic wet peroxide oxidation (CWPO) process [l]. Phosphorous doping was now used as a mean to increase the catalyst performance.
    2015Documento de conferência Acesso aberto Ver mais