Noble metal (e.g., Pd, Ru, Rh)-based catalysis has been emerging as a promising water treatment strategy for reductive destruction of a broad suite of waterborne contaminants. Previously, we have demonstrated that Pd immobilized on functionalized mesoporous silica exhibits enhanced reactivity for hydrogenation of various pollutants such as oxyanions (e.g., BrO3-, ClO3-) and nitroaromatic compounds. Here, we reported the development of bimetallic catalysts that contain a noble metal and a secondary promoter (e.g., Re, In) supported on functionalized materials. Mesoporous silica modified with various functional groups was prepared as model support platform and benchmarked against conventional supports (e.g., alumina, carbon). The performance of the structured catalysts was determined for catalytic reduction of representative oxyanion waterborne pollutants (e.g., BrO3-, ClO3-). Results suggested that proper selection of functional groups significantly enhanced metal dispersion and metal-support interaction, and thus promoted the reduction of oxyanions under environmentally relevant conditions. This presentation will focus on material synthesis, characterization, and activity evaluation under different environmental conditions.

Structured bimetallic catalysts for oxyanion reduction

256th National Meeting (2018)

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