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

materials Sciences and Applications 2023年第2期14卷 78-93页

作者： mouhamad Rachini mira Jaafar Nabil Tabaja Sami Tlais rasha Hamdan Fatima Al Ali Ola Haidar Ali Jaber mohammad Kassem Eugene Bychkov Lucette Tidahy Renaud Cousin Dorothée Dewaele Tayssir Hamieh Joumana Toufaily Laboratory of materials Catalysis Environment and Analytical Methods (MCEMA) EDST FS Lebanese University Hariri Campus Hadath Lebanon Université du Littoral Cô te d’Opale (ULCO) LPCA EA 4493 F-59140 Dunkerque France Laboratory of Applied Studies for Sustainable Development and Renewable Energy (LEADDER) EDST Lebanese University Hariri Campus Hadath Lebanon College of Engineering and Technology American University of the Middle East Kuwait Kuwait Department of Chemistry American University of Beirut Riad El-Solh Beirut Lebanon Laboratoire de Recherche et Développement des médicaments et des Produits Naturels RDmPN Faculty of Pharmacy Lebanese University Hariri Campus Hadath Lebanon Université du Littoral Cô te d’Opale UCEIV Unité de Chimie Environnementale et Interactions sur le Vivant EA 4492 SFR Condorcet FR CNRS 3417 Dunkerque France Centre Commun de mesures Université du Littoral C&ocircte d’Opale Dunkerque France Faculty of Science and Engineering Maastricht University Maastricht The Netherlands

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.

关键词： Bimetallic Catalyst Heterogeneous Catalyst Nitrate Reduction SBA-15 XRD BET SEm FTIR ICP

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