fulltext.study @t Gmail

Increased co-oxidation activity for mercury under hot and cold site coal power plant conditions – Preparation and evaluation of Au/TiO2-coated SCR-DeNOx catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
45723 46421 2015 11 PDF Available
Title
Increased co-oxidation activity for mercury under hot and cold site coal power plant conditions – Preparation and evaluation of Au/TiO2-coated SCR-DeNOx catalysts
Abstract

•Preparation of structured Au/TiO2-coated SCR-DeNOx catalysts.•Their mercury oxidation, DeNOx and SO2/SO3 conversion activity were investigated.•Au/TiO2 coatings are promising for increasing the mercury co-oxidation activity.•Au/TiO2 coatings did not appreciably affect the main DeNOx reaction.•Au/TiO2 coatings increased the SO2/SO3 conversion rate at higher temperatures.

The investigation aims to develop SCR-catalysts with enhanced oxidation activity for elemental mercury. For this, different nano-sized TiO2 particles were coated with 1 and 2 wt.% gold. Suspensions obtained from these particles were used for dip-coating the commercial honeycomb-shaped V2O5–WO3/TiO2 reference SCR catalyst. The mercury oxidation activities of the Au/TiO2-coated catalysts were investigated in the laboratory for the temperature range 180–390 °C and simulated coal-fuel flue gas conditions (O2, SO2, NO, H2O, Hg, HCl and without NH3).At reaction temperatures from 180 to 320 °C, Au/TiO2 coatings enhanced the mercury oxidation activity of the SCR catalyst significantly by a factor of 2. At higher reaction temperatures the positive effect of the Au/TiO2 coatings on mercury oxidation decreased and was strongly dependent on the HCl content of the flue gas. The impact of Au/TiO2 coatings on the DeNOx activity of the SCR catalysts at 390 °C was only marginal. The measured SO2/SO3 conversion activity rates depended on the coating procedure and the gold content of the catalysts.In conclusion, the Au/TiO2 coatings are promising for the development of multi-pollutant SCR-DeNOx catalysts with high mercury co-oxidation activity for cold-site configurations or flue gases with higher HCl contents.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Mercury oxidation; SCR; Gold-based catalysts; SO2/SO3 conversion; DeNOx activity
First Page Preview
Increased co-oxidation activity for mercury under hot and cold site coal power plant conditions – Preparation and evaluation of Au/TiO2-coated SCR-DeNOx catalysts
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 B: Environmental - Volumes 166–167, May 2015, Pages 302–312
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