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Selective removal of the ammonium-nitrogen in ammonium acetate aqueous solutions by catalytic wet air oxidation over supported Pt catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46613 46443 2012 8 PDF Available
Title
Selective removal of the ammonium-nitrogen in ammonium acetate aqueous solutions by catalytic wet air oxidation over supported Pt catalysts
Abstract

The selective removal of ammonia from industrial waste streams and the conversion of the organic matter to biodegradable compounds, without excessive mineralization of the carbon has been investigated over powder and pelletized titania- and zirconia-supported Pt catalysts in the wet air oxidation (WAO) of aqueous solutions at 200 °C under 36 bar of air, in batch and trickle-bed reactors.Ammonium acetate was chosen as a model compound (58 mmol L−1, Total Organic Carbon, TOC = 1392 mg L−1, Total Nitrogen, TN = 812 mg L−1). In the absence of any catalyst, very little ammonium was removed. With addition of a Pt catalyst supported, NH4+ was completely eliminated from the reaction mixture and converted to dinitrogen with a selectivity higher than 97.5%. The treated effluent contained very low concentration of nitrates as a by-product. Interestingly, the platinum catalysts were very little active in the mineralization of the organic carbon, so that the effluent could be post-treated in a conventional biological plant. The catalysts showed the same performances over recycling experiments in a batch reactor. Moreover, the pelletized catalysts were shown to be stable upon preliminary continuous experiments in a trickle-bed reactor over a period of 350 h. The 3%Pt/TiO2 catalysts were significantly more active than the 3%Pt/ZrO2 catalysts in batch and continuous experiments.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Pt/TiO2 catalysts were highly active in NH4+ removal from ammonium acetate effluent. ► The reaction was very selective to N2 (>97.5%). ► Mineralization of the acetate was moderate. ► The Pt catalysts were stable in continuous experiments.

Keywords
Selective catalytic wet air oxidation; Ammonium acetate; Supported platinum catalysts; Batch reactor; Trickle-bed reactor
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Selective removal of the ammonium-nitrogen in ammonium acetate aqueous solutions by catalytic wet air oxidation over supported Pt catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 128, 30 November 2012, Pages 64–71
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
Online Support
Any Questions? feel free to contact us