Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 290, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2022.120750
Keywords
Nitrate; Catalytic reduction; Catalyst deactivation; Regeneration
Categories
Funding
- Spanish MINECO [PID2019-108445RB-I00]
- Comunidad de Madrid (BIO-TRES-CM) [S2018/EMT-4344, PEJD-265 2017-PRE/AMB-4616]
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Nitrate pollution of water bodies is a serious global environmental problem, and there is a lack of cost-effective solutions for its removal. Catalytic reduction is an emerging technology that can transform nitrate into harmless nitrogen gas, but it faces challenges in stability and catalyst regeneration.
Nitrate (NO3-) pollution of water bodies is a serious environmental problem worldwide. One of the major concerns about NO3- contamination is the lack of cost-effective solutions for its removal from potential drinking water resources. Current technologies, such as ion exchange, reverse osmosis and electrodialysis, produce a reject with high NO3- concentration. Catalytic reduction is an emerging technology, capable of transforming NO3- into harmless N-2. A critical issue is to achieve almost complete selectivity to this last species so that the final concentrations of NO2- and NH4+ can fit the stringent allowed limits. Numerous studies have been carried out evaluating the activity and N-2 selectivity of bimetallic catalysts. Catalyst deactivation by surface fouling, irreversible oxidation of the metal promoter, metal leaching and aggregation of metallic particles remain a major challenge for full-scale implementation of catalytic nitrate reduction. Therefore, it is necessary to develop highly stable catalyst and/or effective solutions for catalyst regeneration. The existing literature on this respect is reviewed hereby.
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