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Nitrate reduction by maghemite supported Cu-Pd bimetallic catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
46272 46436 2012 11 PDF Available
Title
Nitrate reduction by maghemite supported Cu-Pd bimetallic catalyst
Abstract

We have investigated the catalytic nitrate reduction by maghemite supported Cu-Pd bimetallic catalyst (maghemite/Cu/Pd). BET, XRD, XPS, TPR, SEM/EDX, TEM analysis were carried out to characterize maghemite/Cu/Pd. Remarkable nitrate removal (99.5%) by maghemite/Cu/Pd was observed in 90 min, while Cu-Pd catalyst supported with alumina (43%) and hematite (63%) showed less efficient nitrate removal. Nitrate removal was excellent (>95%) in all Cu loading variation (0.25–1 wt.%) on maghemite/Cu/Pd, while selectivity of nitrogen gas formed during the reaction was the highest (43%) at a specific Cu/Pd ratio (0.5/0.5 wt.%). We also observed excellent nitrate removals (>95 and >94%, respectively) by maghemite/Cu/Pd in the ranges of Pd loading (0.25–1 wt.%) and hydrogen flow rate (100–500 cc/min). The highest nitrogen selectivities (47 and 45%) were obtained by low Pd loading (0.25 wt.%) and hydrogen flow rate (200 cc/min). Maghemite/Cu/Pd showed slow decrease of nitrate removal (99.5–83%) and low metal leaching (1.5% of Cu leaching) during three reaction cycles. XPS analysis revealed that Cu(0) was oxidized to Cu2O and CuO during the catalytic nitrate reduction, while Pd(0) was not changed.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Maghemite/Cu/Pd showed excellent catalytic nitrate reduction (99.5%). ► Cu loading at 0.5 wt.% showed the highest N2 gas selectivity (43%). ► Pd loading at 0.25 wt.% showed the highest N2 gas selectivity (47%). ► Lower H2 flow rates enhanced N2 gas selectivity. ► Maghemite/Cu/Pd showed stable nitrate removal during three reaction cycles.

Keywords
Maghemite; Bimetallic catalyst; Catalytic nitrate reduction; Nitrogen gas selectivity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 127, 30 October 2012, Pages 148–158
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