| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9610172 | Catalysis Today | 2005 | 6 Pages |
Abstract
Removal of nitrates and nitrites from drinking water by catalytic hydrogenation over zeolite-supported Pt-Sn catalysts was studied. Bimetallic Pt-Sn/HZSM-5 catalysts were characterized by temperature-programmed reduction (TPR), H2 chemisorption, X-ray photoelectron spectroscopy (XPS) and 119Sn Mössbauer spectroscopy. The characterization techniques showed a significant decrease in the H/Pt ratio upon tin addition, tin surface enrichment, the formation of PtSn alloys and platinum catalysis of the tin reduction. The Pt-Sn/HZSM-5 catalyst clearly showed high catalytic activity for the reduction of nitrate to form N2. In the bimetallic catalyst, the role of tin is to reduce nitrate or nitrite according to a redox process, while the platinum maintains tin in the metallic state.
Related Topics
Physical Sciences and Engineering
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Authors
Rafael RodrÃguez, Carolina Pfaff, Luis Melo, Paulino Betancourt,