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On the role of Pd β-hydride in the reduction of nitrate over Pd based catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
47906 46485 2008 6 PDF Available
Title
On the role of Pd β-hydride in the reduction of nitrate over Pd based catalyst
Abstract

Two monometallic palladium catalysts supported on γ-Al2O3 were synthesized using different precursors, Pd(AcAc)2 and Pd(NO3)2, while Pd-Cu/γ Al2O3 catalysts were prepared from those parent catalysts. The samples were tested for the elimination of nitrate and nitrite from aqueous solutions using hydrogen as a reductant in a standard batch reactor. Besides, the reduction of nitrate was carried out in a series of two reactors by an electrochemical cell mechanism. In this case, nitrate was reduced to nitrite by electrons supplied from the first reactor. The following reduction of nitrite was performed over the monometallic catalyst. Both the conversion and the selectivity to N2 were higher than in the standard batch reactor. Monometallic samples prepared from Pd(AcAc)2 showed an extremely high selectivity to the desired product. The catalysts were characterized by transmission electron microscopy (TEM), temperature programmed reduction (TPR) and H2 chemisorption. Differences in particle size and β-hydride formation were observed for the different samples. The possible role of Pd β-hydride in the formation of overhydrogenated products is discussed.

Keywords
Nitrate reduction; Nitrite reduction; Supported palladium; β-Hydride; Palladium-copper catalyst
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On the role of Pd β-hydride in the reduction of nitrate over Pd based catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 1–2, 25 October 2008, Pages 156–161
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us