fulltext.study @t Gmail

Characterization of (Sn and Cu)/Pd catalysts for the nitrate reduction in natural water

Paper ID Volume ID Publish Year Pages File Format Full-Text
40936 45871 2012 8 PDF Available
Title
Characterization of (Sn and Cu)/Pd catalysts for the nitrate reduction in natural water
Abstract

The aim of this work is to characterize different (Cu and Sn)/Pd catalysts, supported on alumina, used for the catalytic removal of nitrates in natural water. The catalysts have been prepared with a Pd/(Cu or Sn) ratio of 2 but with different metal contents. Their activity and selectivity have been studied using a continuous stirred-tank reactor with nitrate polluted water from an aquifer. The catalysts have been characterized both before and after reaction by XPS, XRD, XRF, adsorption–desorption N2 isotherms at 196 °C and TEM. XPS results show changes of the Pd/Sn surface atomic ratio upon catalyst activation and after reaction and the coexistence of different oxidation states for the active metals. The studied catalysts are active, being the catalyst with the best performance that with the highest metallic dispersion and with the lowest phases segregation. The characterization of the catalysts after reaction shows that catalyst deactivation could be related with the non-reversible oxidation of the Sn–Pd couple.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (137 K)Download as PowerPoint slideHighlights► Pd/Sn catalysts supported on alumina are characterized by XPS and other techniques. ► The Pd/Sn surface atomic ratio change upon catalyst activation and after reaction. ► The most active catalyst is 0.5% Sn–1% Pd supported on high surface area Al2O3. ► Deactivation is due to irreversible Sn–Pd oxidations or to competitive adsorptions.

Keywords
Nitrate catalytic reduction; Natural water; Continuous process; Sn–Pd; Cu–Pd, XPS
First Page Preview
Characterization of (Sn and Cu)/Pd catalysts for the nitrate reduction in natural water
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 425–426, 28 May 2012, Pages 145–152
Authors
, , , ,
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