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C.D.R. Azevedo,A. Baeza,E. Chauveau,J.A. Corbacho,J. Diaz,J. Domange,C. Marquet,M. Martinez-Roig,F. Piquemal,C. Roldan,J. Vasco,J.F.C.A. Veloso,N. Yahlali Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
In the TRITIUM project, an on-site monitoring system is being developed to measure tritium (<sup>3</sup>H) levels in water near nuclear power plants. The quite low-energy betas emitted by <sup>3</sup>H have a very short average path in water (5 ㎛ as shown by simulations for 18 keV electrons). This path would be further reduced by impurities present in the water, resulting in a significant reduction of the detection efficiency. Therefore, one of the essential requirements of the project is the elimination of these impurities through a filtration process and the removal of salts in solution. This paper describes a water treatment system developed for the project that meets the following requirements: the water produced should be of near-pure water quality according to ISO 3696 grade 3 standard (conductivity < 10 µS/cm); the system should operate autonomously and be remotely monitored.
Control of selectivity in the reduction of nitrate by shielding of Pd–Cu/C catalysts with AOT
A.M. Pérez-Coronado,L. Calvo,J.A. Baeza,J.J. Rodriguez,M.A. Gilarranz 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Catalytic chemical reduction of nitrate without generating harmful nitrite and ammonium is still achallenge limiting the application of this technology to the production of drinking water. In this work anew approach was proposed based on shielding of Pd active sites in PdCu catalysts by sodium bis-2-ethylhexyl sulphosuccinate (AOT). To study this concept and the interactions between PdCu and AOT,carbon-supported PdCu catalysts were prepared by microemulsion using AOT as surfactant, and byincipient wetness impregnation followed by exposure to AOT. All the catalysts based on AOT showedlower activity in nitrate reduction than those prepared by ordinary incipient wetness impregnation,however ammonium generation was prevented thanks to shielding of Pd active sites by AOT. Bimetalliccatalysts prepared by physically mixing Pd and Cu monometallic catalysts and exposure to AOT revealed alower activity in nitrate reduction, which was ascribed to the interference of AOT in the Pd–Cu redoxmechanism and lower hydrogen spillover. However, the catalysts maintained the ability to reduce nitritewith negligible production of ammonium, showing that shielding of Pd active sites can be an interestingapproach to avoid nitrite and ammonium formation in nitrate reduction, but a compromise betweenactivity and selectivity must be achieved.