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Decomposition of tributhyl phosphate at supercritical water oxidation conditions: Non-catalytic, catalytic, and kinetic reaction studies

Kosari, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1016/j.supflu.2017.09.012
  3. Publisher: Elsevier B.V , 2018
  4. Abstract:
  5. Tributhyl phosphate (TBP) decomposition in supercritical water oxidation (SCWO) was performed with and without catalyst, at different temperatures ranging from 370 to 480 °C, and different reaction times. Ag2O, CuO, Fe2O3, MgO, and ZnO synthesized by supercritical water were examined in TBP decomposition as the catalyst. TBP structure decomposed under the non-catalytic reaction; nevertheless, the results indicated that the use of catalysts improved the reaction efficiency, which calculated based on total organic carbon (TOC) removal, by far. However, TOC removal using Fe2O3 was 20% higher than the non-catalytic reaction. Having the ability in completion of the redox cycle, iron oxide catalytic nanoparticles preserve their stability and performance when used in a sequential TBP decomposition experiment. As for the estimation of the reaction rates, the kinetic constants were evaluated. Possessing a high predictive power with the accuracy more than 90%, the proposed kinetic equations can be applicable for further studies dealing with the TBP decomposition adopting SCWO. © 2017 Elsevier B.V
  6. Keywords:
  7. Catalytic decomposition ; Oxidation ; Tributhyl phosphate (TBP) ; Carbon ; Catalysis ; Catalysts ; Enzyme kinetics ; Integral equations ; Kinetics ; Organic carbon ; Rate constants ; Reaction rates ; Redox reactions ; Catalytic nanoparticle ; Non-catalytic reactions ; Reaction efficiency ; Supercritical water ; Supercritical water oxidation ; Total Organic Carbon ; Catalytic oxidation
  8. Source: Journal of Supercritical Fluids ; Volume 133 , 2018 , Pages 103-113 ; 08968446 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0896844617304199