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Ag/bauxite catalysts: Improved low-temperature activity and SO2 tolerance for H2-promoted NH3-SCR of NOx

Paper ID Volume ID Publish Year Pages File Format Full-Text
45603 46416 2015 6 PDF Available
Title
Ag/bauxite catalysts: Improved low-temperature activity and SO2 tolerance for H2-promoted NH3-SCR of NOx
Abstract

•Ag/bauxite possesses much higher SCR activity below 250 °C than Ag/Al2O3.•Ag/bauxite possesses much stronger tolerance against SO2 and H2O than Ag/Al2O3.•The compositions of bauxite are beneficial to improve SCR performances.

A series of Ag/bauxite catalysts were applied in H2-promoted selective catalytic reduction (SCR) of NOx. In comparison with 3Ag/Al2O3, 3Ag/bauxite exhibits higher catalytic activity at low temperature, stronger resistance to SO2 poisoning and better regenerability in SCR of NOx. NOx conversion of 3Ag/bauxite at 100–200 °C is more than 60%, which is much higher than less than 7% in 3Ag/Al2O3. NH3-TPD and in situ DRIFTS studies confirm the presence of Lewis and Brønsted acid sites in Ag/bauxite, and Lewis acid sites are the major acid sites. H2-TPR, UV–vis, in situ DRIFTS and DFT calculation show that FeOx and metallic Ag clusters are main active species in SCR of NOx at low temperature.

Graphical abstractAg/bauxite catalysts show much higher catalytic activity at low temperature, stronger resistance against SO2 and better regenerability than Ag/Al2O3, which can serve as promising alternative for Ag/Al2O3 in selective catalytic reduction of NOx.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ag species; Bauxite; Environmental chemistry; NOx removal; Selective catalytic reduction
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Ag/bauxite catalysts: Improved low-temperature activity and SO2 tolerance for H2-promoted NH3-SCR of NOx
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 165, April 2015, Pages 700–705
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