Abstract
Well defined microscopic supported mono- and bimetallic catalysts and colloidal metals were prepared and encapsulated in hydrogel beads of polyvinyl alcohol resulting in a well defined macroscopic catalyst. Polyvinyl alcohol hydrogel beads possess high chemical and mechanical stability as well as very good diffusional properties. The encapsulated catalysts showed high activity, selectivity and effectiveness factors for the water phase nitrate and nitrite reduction with hydrogen or formic acid as reducing agent.
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