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Effect of supports on Pd–Cu bimetallic catalysts for nitrate and nitrite reduction in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
55505 47056 2012 7 PDF Available
Title
Effect of supports on Pd–Cu bimetallic catalysts for nitrate and nitrite reduction in water
Abstract

The activities of the Pd–Cu catalysts supported on various metal oxides for the reduction of nitrate and nitrite ions were compared at a constant pH. Among them, the catalysts supported on titania xerogel prepared by a glycothermal method showed the highest performance for nitrate reduction. For the reduction of nitrite ions, Pd–Cu/CeO2 showed the highest catalytic activity; however, significant dissolution of the components of the catalyst was observed during the reaction at a relatively low pH range. On the other hand, a single-component Pd catalyst supported on titania xerogel showed excellent activity for the reduction of nitrite ion and could be used at a wide range of pH. For these catalysts, the product selectivity for N2 from nitrite ions was markedly improved by decreasing the partial pressure of H2 in the feed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (256 K)Download as PowerPoint slideHighlights► Activities of metal oxide-supported Pd–Cu catalysts were compared at constant pH. ► Titania xerogels prepared by the glycothermal method are excellent catalyst supports. ► Titania xerogel markedly promotes the reduction of surface Cu species. ► Severe dissolution of ceria-supported catalysts was observed at low pH.

Keywords
Nitrate reduction; Nitrite reduction; Titania; Pd–Cu catalyst; Glycothermal method
First Page Preview
Effect of supports on Pd–Cu bimetallic catalysts for nitrate and nitrite reduction in water
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 185, Issue 1, 20 May 2012, Pages 81–87
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis