Journal
CHEMICAL ENGINEERING JOURNAL
Volume 289, Issue -, Pages 423-432Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.01.002
Keywords
Catalytic denitrification; Ion-exchange; Integrated process; PdCu catalysts
Categories
Funding
- Korean Ministry of Environment
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2011-0011392]
- National Research Foundation of Korea [2011-0011392] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An integrated process synergistically combining the advantages of catalysis and ion-exchange is demonstrated for the selective and complete degradation of NO3- from contaminated water. To realize this process, PdCu catalysts were supported on an ion-exchange resin. The functional resin captures NO3- in an ion-exchange mode, whereas the concentrated NO3- in the resin is fully reduced by the supported PdCu in a catalytic regeneration mode. The complete conversion of the captured NO3- indicates that the solid-state diffusion of NO3- within the resin is possible through consecutive ion-hopping. Catalytic resin regeneration under H-2/CO2 (1/1, v/v) was found to reduce NO3- to N-2 selectively without the formation of the toxic byproduct NH4+. The complete suppression of the NH4+ formation (similar to 100% N-2 selectivity) has never been reported previously. It is well known that the accumulation of OH- ions generated during the NO3- reduction significantly enhances the formation of NH4+. We propose that OH- ions generated on the catalyst surface are rapidly captured by the ion-exchange sites of the resin, thus minimizing the detrimental interaction between OH- and the catalyst surface. The ion-exchange/catalytic regeneration cycle could be repeated up to five times without a loss of the NO3- ion-exchange capacity or catalytic regenerability. (C) 2016 Elsevier B.V. All rights reserved.
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