Activity and Selectivity of Bimetallic Catalysts Based on SBA-15 for Nitrate Reduction in Water - Unité de Chimie Environnementale et Interactions sur le vivant Access content directly
Journal Articles Materials Sciences and Applications Year : 2023

Activity and Selectivity of Bimetallic Catalysts Based on SBA-15 for Nitrate Reduction in Water

Mouhamad Rachini
  • Function : Author
Sami Tlais
  • Function : Author
Rasha Hamdan
  • Function : Author
Fatima Al Ali
  • Function : Author
Ola Haidar
  • Function : Author

Abstract

Nitrate from the application of nitrogen-based fertilizers in intensive agriculture is a notorious waste product, though it lacks cost-effective solutions for its removal from potential drinking water resources. Catalytic reduction appears to be a promising technique for converting nitrates to benign nitrogen gas. Mesoporous silica SBA-15 is a frequently used catalyst support that has large surface areas and highly ordered nanopores. In this work, mesoporous silica SBA-15 bimetallic catalysts for nitrate reduction were investigated. The catalyst was optimized for the selection of promoter metal (Sn and Cu), noble metal (Pd and Pt) and loading ratios of these metals at different temperatures and reduction conditions. The catalysts prepared were characterized by FT-IR, N2 physisorption, XRD, SEM, and ICP. All catalysts showed the presence of cylindrical mesoporous channels and uniform pore structures that remained even after metals loading. In the presence of a CO2 buffer, the catalysts 4Pd-1Cu/SBA-15 and 1Pt-1Cu/SBA-15 reduced at 100?C under H2 and 1Pd-1Cu/SBA-15 reduced at 200°C under H2 demonstrated very high nitrate conversion. Furthermore, the forementioned Pd catalysts had higher N2 selectivity (88% - 87%) compared to Pt catalyst (80%). Nitrate conversion by the 4Pd-1Cu/SBA-15 catalyst was significantly decreased to 81% in the absence of CO2.
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Dates and versions

hal-04295492 , version 1 (14-02-2024)

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Mouhamad Rachini, Mira Jaafar, Nabil Tabaja, Sami Tlais, Rasha Hamdan, et al.. Activity and Selectivity of Bimetallic Catalysts Based on SBA-15 for Nitrate Reduction in Water. Materials Sciences and Applications, 2023, 14 (02), pp.78-93. ⟨10.4236/msa.2023.142006⟩. ⟨hal-04295492⟩
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